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1 | \input texinfo @c -*-texinfo-*- |
2 | ||
3 | @c %**start of header | |
4 | @setfilename libgomp.info | |
5 | @settitle GNU libgomp | |
6 | @c %**end of header | |
7 | ||
8 | ||
9 | @copying | |
c1a9c369 | 10 | Copyright @copyright{} 2006-2017 Free Software Foundation, Inc. |
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11 | |
12 | Permission is granted to copy, distribute and/or modify this document | |
07a67d6a | 13 | under the terms of the GNU Free Documentation License, Version 1.3 or |
3721b9e1 | 14 | any later version published by the Free Software Foundation; with the |
70b1e376 | 15 | Invariant Sections being ``Funding Free Software'', the Front-Cover |
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16 | texts being (a) (see below), and with the Back-Cover Texts being (b) |
17 | (see below). A copy of the license is included in the section entitled | |
18 | ``GNU Free Documentation License''. | |
19 | ||
20 | (a) The FSF's Front-Cover Text is: | |
21 | ||
22 | A GNU Manual | |
23 | ||
24 | (b) The FSF's Back-Cover Text is: | |
25 | ||
26 | You have freedom to copy and modify this GNU Manual, like GNU | |
27 | software. Copies published by the Free Software Foundation raise | |
28 | funds for GNU development. | |
29 | @end copying | |
30 | ||
31 | @ifinfo | |
32 | @dircategory GNU Libraries | |
33 | @direntry | |
f1f3453e | 34 | * libgomp: (libgomp). GNU Offloading and Multi Processing Runtime Library. |
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35 | @end direntry |
36 | ||
f1f3453e | 37 | This manual documents libgomp, the GNU Offloading and Multi Processing |
41dbbb37 TS |
38 | Runtime library. This is the GNU implementation of the OpenMP and |
39 | OpenACC APIs for parallel and accelerator programming in C/C++ and | |
40 | Fortran. | |
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41 | |
42 | Published by the Free Software Foundation | |
43 | 51 Franklin Street, Fifth Floor | |
44 | Boston, MA 02110-1301 USA | |
45 | ||
46 | @insertcopying | |
47 | @end ifinfo | |
48 | ||
49 | ||
50 | @setchapternewpage odd | |
51 | ||
52 | @titlepage | |
f1f3453e | 53 | @title GNU Offloading and Multi Processing Runtime Library |
41dbbb37 | 54 | @subtitle The GNU OpenMP and OpenACC Implementation |
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55 | @page |
56 | @vskip 0pt plus 1filll | |
57 | @comment For the @value{version-GCC} Version* | |
58 | @sp 1 | |
59 | Published by the Free Software Foundation @* | |
60 | 51 Franklin Street, Fifth Floor@* | |
61 | Boston, MA 02110-1301, USA@* | |
62 | @sp 1 | |
63 | @insertcopying | |
64 | @end titlepage | |
65 | ||
66 | @summarycontents | |
67 | @contents | |
68 | @page | |
69 | ||
70 | ||
71 | @node Top | |
72 | @top Introduction | |
73 | @cindex Introduction | |
74 | ||
f1f3453e | 75 | This manual documents the usage of libgomp, the GNU Offloading and |
41dbbb37 TS |
76 | Multi Processing Runtime Library. This includes the GNU |
77 | implementation of the @uref{http://www.openmp.org, OpenMP} Application | |
78 | Programming Interface (API) for multi-platform shared-memory parallel | |
79 | programming in C/C++ and Fortran, and the GNU implementation of the | |
80 | @uref{http://www.openacc.org/, OpenACC} Application Programming | |
81 | Interface (API) for offloading of code to accelerator devices in C/C++ | |
82 | and Fortran. | |
3721b9e1 | 83 | |
41dbbb37 TS |
84 | Originally, libgomp implemented the GNU OpenMP Runtime Library. Based |
85 | on this, support for OpenACC and offloading (both OpenACC and OpenMP | |
86 | 4's target construct) has been added later on, and the library's name | |
87 | changed to GNU Offloading and Multi Processing Runtime Library. | |
f1f3453e | 88 | |
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89 | |
90 | ||
91 | @comment | |
92 | @comment When you add a new menu item, please keep the right hand | |
93 | @comment aligned to the same column. Do not use tabs. This provides | |
94 | @comment better formatting. | |
95 | @comment | |
96 | @menu | |
97 | * Enabling OpenMP:: How to enable OpenMP for your applications. | |
98 | * Runtime Library Routines:: The OpenMP runtime application programming | |
99 | interface. | |
100 | * Environment Variables:: Influencing runtime behavior with environment | |
101 | variables. | |
cdf6119d JN |
102 | * Enabling OpenACC:: How to enable OpenACC for your |
103 | applications. | |
104 | * OpenACC Runtime Library Routines:: The OpenACC runtime application | |
105 | programming interface. | |
106 | * OpenACC Environment Variables:: Influencing OpenACC runtime behavior with | |
107 | environment variables. | |
108 | * CUDA Streams Usage:: Notes on the implementation of | |
109 | asynchronous operations. | |
110 | * OpenACC Library Interoperability:: OpenACC library interoperability with the | |
111 | NVIDIA CUBLAS library. | |
3721b9e1 | 112 | * The libgomp ABI:: Notes on the external ABI presented by libgomp. |
f1f3453e TS |
113 | * Reporting Bugs:: How to report bugs in the GNU Offloading and |
114 | Multi Processing Runtime Library. | |
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115 | * Copying:: GNU general public license says |
116 | how you can copy and share libgomp. | |
117 | * GNU Free Documentation License:: | |
118 | How you can copy and share this manual. | |
119 | * Funding:: How to help assure continued work for free | |
120 | software. | |
3d3949df | 121 | * Library Index:: Index of this documentation. |
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122 | @end menu |
123 | ||
124 | ||
125 | @c --------------------------------------------------------------------- | |
126 | @c Enabling OpenMP | |
127 | @c --------------------------------------------------------------------- | |
128 | ||
129 | @node Enabling OpenMP | |
130 | @chapter Enabling OpenMP | |
131 | ||
132 | To activate the OpenMP extensions for C/C++ and Fortran, the compile-time | |
83fd6c5b | 133 | flag @command{-fopenmp} must be specified. This enables the OpenMP directive |
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134 | @code{#pragma omp} in C/C++ and @code{!$omp} directives in free form, |
135 | @code{c$omp}, @code{*$omp} and @code{!$omp} directives in fixed form, | |
136 | @code{!$} conditional compilation sentinels in free form and @code{c$}, | |
83fd6c5b | 137 | @code{*$} and @code{!$} sentinels in fixed form, for Fortran. The flag also |
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138 | arranges for automatic linking of the OpenMP runtime library |
139 | (@ref{Runtime Library Routines}). | |
140 | ||
141 | A complete description of all OpenMP directives accepted may be found in | |
142 | the @uref{http://www.openmp.org, OpenMP Application Program Interface} manual, | |
00b9bd52 | 143 | version 4.5. |
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144 | |
145 | ||
146 | @c --------------------------------------------------------------------- | |
147 | @c Runtime Library Routines | |
148 | @c --------------------------------------------------------------------- | |
149 | ||
150 | @node Runtime Library Routines | |
151 | @chapter Runtime Library Routines | |
152 | ||
83fd6c5b | 153 | The runtime routines described here are defined by Section 3 of the OpenMP |
00b9bd52 | 154 | specification in version 4.5. The routines are structured in following |
5c6ed53a | 155 | three parts: |
3721b9e1 | 156 | |
72832460 | 157 | @menu |
83fd6c5b TB |
158 | Control threads, processors and the parallel environment. They have C |
159 | linkage, and do not throw exceptions. | |
f5745bed | 160 | |
5c6ed53a TB |
161 | * omp_get_active_level:: Number of active parallel regions |
162 | * omp_get_ancestor_thread_num:: Ancestor thread ID | |
83fd6c5b TB |
163 | * omp_get_cancellation:: Whether cancellation support is enabled |
164 | * omp_get_default_device:: Get the default device for target regions | |
5c6ed53a TB |
165 | * omp_get_dynamic:: Dynamic teams setting |
166 | * omp_get_level:: Number of parallel regions | |
6a2ba183 | 167 | * omp_get_max_active_levels:: Maximum number of active regions |
d9a6bd32 | 168 | * omp_get_max_task_priority:: Maximum task priority value that can be set |
6a2ba183 | 169 | * omp_get_max_threads:: Maximum number of threads of parallel region |
5c6ed53a | 170 | * omp_get_nested:: Nested parallel regions |
83fd6c5b | 171 | * omp_get_num_devices:: Number of target devices |
5c6ed53a | 172 | * omp_get_num_procs:: Number of processors online |
83fd6c5b | 173 | * omp_get_num_teams:: Number of teams |
5c6ed53a | 174 | * omp_get_num_threads:: Size of the active team |
83fd6c5b | 175 | * omp_get_proc_bind:: Whether theads may be moved between CPUs |
5c6ed53a | 176 | * omp_get_schedule:: Obtain the runtime scheduling method |
83fd6c5b | 177 | * omp_get_team_num:: Get team number |
5c6ed53a | 178 | * omp_get_team_size:: Number of threads in a team |
6a2ba183 | 179 | * omp_get_thread_limit:: Maximum number of threads |
5c6ed53a TB |
180 | * omp_get_thread_num:: Current thread ID |
181 | * omp_in_parallel:: Whether a parallel region is active | |
20906c66 | 182 | * omp_in_final:: Whether in final or included task region |
83fd6c5b TB |
183 | * omp_is_initial_device:: Whether executing on the host device |
184 | * omp_set_default_device:: Set the default device for target regions | |
5c6ed53a TB |
185 | * omp_set_dynamic:: Enable/disable dynamic teams |
186 | * omp_set_max_active_levels:: Limits the number of active parallel regions | |
187 | * omp_set_nested:: Enable/disable nested parallel regions | |
188 | * omp_set_num_threads:: Set upper team size limit | |
189 | * omp_set_schedule:: Set the runtime scheduling method | |
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190 | |
191 | Initialize, set, test, unset and destroy simple and nested locks. | |
192 | ||
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193 | * omp_init_lock:: Initialize simple lock |
194 | * omp_set_lock:: Wait for and set simple lock | |
195 | * omp_test_lock:: Test and set simple lock if available | |
196 | * omp_unset_lock:: Unset simple lock | |
197 | * omp_destroy_lock:: Destroy simple lock | |
198 | * omp_init_nest_lock:: Initialize nested lock | |
199 | * omp_set_nest_lock:: Wait for and set simple lock | |
200 | * omp_test_nest_lock:: Test and set nested lock if available | |
201 | * omp_unset_nest_lock:: Unset nested lock | |
202 | * omp_destroy_nest_lock:: Destroy nested lock | |
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203 | |
204 | Portable, thread-based, wall clock timer. | |
205 | ||
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206 | * omp_get_wtick:: Get timer precision. |
207 | * omp_get_wtime:: Elapsed wall clock time. | |
208 | @end menu | |
209 | ||
5c6ed53a TB |
210 | |
211 | ||
212 | @node omp_get_active_level | |
213 | @section @code{omp_get_active_level} -- Number of parallel regions | |
214 | @table @asis | |
215 | @item @emph{Description}: | |
216 | This function returns the nesting level for the active parallel blocks, | |
217 | which enclose the calling call. | |
218 | ||
219 | @item @emph{C/C++} | |
220 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 221 | @item @emph{Prototype}: @tab @code{int omp_get_active_level(void);} |
5c6ed53a TB |
222 | @end multitable |
223 | ||
224 | @item @emph{Fortran}: | |
225 | @multitable @columnfractions .20 .80 | |
acb5c916 | 226 | @item @emph{Interface}: @tab @code{integer function omp_get_active_level()} |
5c6ed53a TB |
227 | @end multitable |
228 | ||
229 | @item @emph{See also}: | |
230 | @ref{omp_get_level}, @ref{omp_get_max_active_levels}, @ref{omp_set_max_active_levels} | |
231 | ||
232 | @item @emph{Reference}: | |
00b9bd52 | 233 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.20. |
5c6ed53a TB |
234 | @end table |
235 | ||
236 | ||
237 | ||
238 | @node omp_get_ancestor_thread_num | |
239 | @section @code{omp_get_ancestor_thread_num} -- Ancestor thread ID | |
240 | @table @asis | |
241 | @item @emph{Description}: | |
242 | This function returns the thread identification number for the given | |
83fd6c5b | 243 | nesting level of the current thread. For values of @var{level} outside |
5c6ed53a TB |
244 | zero to @code{omp_get_level} -1 is returned; if @var{level} is |
245 | @code{omp_get_level} the result is identical to @code{omp_get_thread_num}. | |
246 | ||
247 | @item @emph{C/C++} | |
248 | @multitable @columnfractions .20 .80 | |
249 | @item @emph{Prototype}: @tab @code{int omp_get_ancestor_thread_num(int level);} | |
250 | @end multitable | |
251 | ||
252 | @item @emph{Fortran}: | |
253 | @multitable @columnfractions .20 .80 | |
acb5c916 | 254 | @item @emph{Interface}: @tab @code{integer function omp_get_ancestor_thread_num(level)} |
5c6ed53a TB |
255 | @item @tab @code{integer level} |
256 | @end multitable | |
257 | ||
258 | @item @emph{See also}: | |
259 | @ref{omp_get_level}, @ref{omp_get_thread_num}, @ref{omp_get_team_size} | |
260 | ||
261 | @item @emph{Reference}: | |
00b9bd52 | 262 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.18. |
83fd6c5b TB |
263 | @end table |
264 | ||
265 | ||
266 | ||
267 | @node omp_get_cancellation | |
268 | @section @code{omp_get_cancellation} -- Whether cancellation support is enabled | |
269 | @table @asis | |
270 | @item @emph{Description}: | |
271 | This function returns @code{true} if cancellation is activated, @code{false} | |
272 | otherwise. Here, @code{true} and @code{false} represent their language-specific | |
273 | counterparts. Unless @env{OMP_CANCELLATION} is set true, cancellations are | |
274 | deactivated. | |
275 | ||
276 | @item @emph{C/C++}: | |
277 | @multitable @columnfractions .20 .80 | |
278 | @item @emph{Prototype}: @tab @code{int omp_get_cancellation(void);} | |
279 | @end multitable | |
280 | ||
281 | @item @emph{Fortran}: | |
282 | @multitable @columnfractions .20 .80 | |
283 | @item @emph{Interface}: @tab @code{logical function omp_get_cancellation()} | |
284 | @end multitable | |
285 | ||
286 | @item @emph{See also}: | |
287 | @ref{OMP_CANCELLATION} | |
288 | ||
289 | @item @emph{Reference}: | |
00b9bd52 | 290 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.9. |
83fd6c5b TB |
291 | @end table |
292 | ||
293 | ||
294 | ||
295 | @node omp_get_default_device | |
296 | @section @code{omp_get_default_device} -- Get the default device for target regions | |
297 | @table @asis | |
298 | @item @emph{Description}: | |
299 | Get the default device for target regions without device clause. | |
300 | ||
301 | @item @emph{C/C++}: | |
302 | @multitable @columnfractions .20 .80 | |
303 | @item @emph{Prototype}: @tab @code{int omp_get_default_device(void);} | |
304 | @end multitable | |
305 | ||
306 | @item @emph{Fortran}: | |
307 | @multitable @columnfractions .20 .80 | |
308 | @item @emph{Interface}: @tab @code{integer function omp_get_default_device()} | |
309 | @end multitable | |
310 | ||
311 | @item @emph{See also}: | |
312 | @ref{OMP_DEFAULT_DEVICE}, @ref{omp_set_default_device} | |
313 | ||
314 | @item @emph{Reference}: | |
00b9bd52 | 315 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.30. |
5c6ed53a TB |
316 | @end table |
317 | ||
318 | ||
319 | ||
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320 | @node omp_get_dynamic |
321 | @section @code{omp_get_dynamic} -- Dynamic teams setting | |
322 | @table @asis | |
323 | @item @emph{Description}: | |
324 | This function returns @code{true} if enabled, @code{false} otherwise. | |
325 | Here, @code{true} and @code{false} represent their language-specific | |
326 | counterparts. | |
327 | ||
14734fc7 | 328 | The dynamic team setting may be initialized at startup by the |
83fd6c5b TB |
329 | @env{OMP_DYNAMIC} environment variable or at runtime using |
330 | @code{omp_set_dynamic}. If undefined, dynamic adjustment is | |
14734fc7 DF |
331 | disabled by default. |
332 | ||
3721b9e1 DF |
333 | @item @emph{C/C++}: |
334 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 335 | @item @emph{Prototype}: @tab @code{int omp_get_dynamic(void);} |
3721b9e1 DF |
336 | @end multitable |
337 | ||
338 | @item @emph{Fortran}: | |
339 | @multitable @columnfractions .20 .80 | |
340 | @item @emph{Interface}: @tab @code{logical function omp_get_dynamic()} | |
341 | @end multitable | |
342 | ||
343 | @item @emph{See also}: | |
14734fc7 | 344 | @ref{omp_set_dynamic}, @ref{OMP_DYNAMIC} |
3721b9e1 DF |
345 | |
346 | @item @emph{Reference}: | |
00b9bd52 | 347 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.8. |
5c6ed53a TB |
348 | @end table |
349 | ||
350 | ||
351 | ||
352 | @node omp_get_level | |
353 | @section @code{omp_get_level} -- Obtain the current nesting level | |
354 | @table @asis | |
355 | @item @emph{Description}: | |
356 | This function returns the nesting level for the parallel blocks, | |
357 | which enclose the calling call. | |
358 | ||
359 | @item @emph{C/C++} | |
360 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 361 | @item @emph{Prototype}: @tab @code{int omp_get_level(void);} |
5c6ed53a TB |
362 | @end multitable |
363 | ||
364 | @item @emph{Fortran}: | |
365 | @multitable @columnfractions .20 .80 | |
acb5c916 | 366 | @item @emph{Interface}: @tab @code{integer function omp_level()} |
5c6ed53a TB |
367 | @end multitable |
368 | ||
369 | @item @emph{See also}: | |
370 | @ref{omp_get_active_level} | |
371 | ||
372 | @item @emph{Reference}: | |
00b9bd52 | 373 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.17. |
5c6ed53a TB |
374 | @end table |
375 | ||
376 | ||
377 | ||
378 | @node omp_get_max_active_levels | |
6a2ba183 | 379 | @section @code{omp_get_max_active_levels} -- Maximum number of active regions |
5c6ed53a TB |
380 | @table @asis |
381 | @item @emph{Description}: | |
6a2ba183 | 382 | This function obtains the maximum allowed number of nested, active parallel regions. |
5c6ed53a TB |
383 | |
384 | @item @emph{C/C++} | |
385 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 386 | @item @emph{Prototype}: @tab @code{int omp_get_max_active_levels(void);} |
5c6ed53a TB |
387 | @end multitable |
388 | ||
389 | @item @emph{Fortran}: | |
390 | @multitable @columnfractions .20 .80 | |
acb5c916 | 391 | @item @emph{Interface}: @tab @code{integer function omp_get_max_active_levels()} |
5c6ed53a TB |
392 | @end multitable |
393 | ||
394 | @item @emph{See also}: | |
395 | @ref{omp_set_max_active_levels}, @ref{omp_get_active_level} | |
396 | ||
397 | @item @emph{Reference}: | |
00b9bd52 | 398 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.16. |
3721b9e1 DF |
399 | @end table |
400 | ||
401 | ||
d9a6bd32 JJ |
402 | @node omp_get_max_task_priority |
403 | @section @code{omp_get_max_task_priority} -- Maximum priority value | |
404 | that can be set for tasks. | |
405 | @table @asis | |
406 | @item @emph{Description}: | |
407 | This function obtains the maximum allowed priority number for tasks. | |
408 | ||
409 | @item @emph{C/C++} | |
410 | @multitable @columnfractions .20 .80 | |
411 | @item @emph{Prototype}: @tab @code{int omp_get_max_task_priority(void);} | |
412 | @end multitable | |
413 | ||
414 | @item @emph{Fortran}: | |
415 | @multitable @columnfractions .20 .80 | |
416 | @item @emph{Interface}: @tab @code{integer function omp_get_max_task_priority()} | |
417 | @end multitable | |
418 | ||
419 | @item @emph{Reference}: | |
420 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.29. | |
421 | @end table | |
422 | ||
3721b9e1 DF |
423 | |
424 | @node omp_get_max_threads | |
6a2ba183 | 425 | @section @code{omp_get_max_threads} -- Maximum number of threads of parallel region |
3721b9e1 DF |
426 | @table @asis |
427 | @item @emph{Description}: | |
6a2ba183 | 428 | Return the maximum number of threads used for the current parallel region |
5c6ed53a | 429 | that does not use the clause @code{num_threads}. |
3721b9e1 DF |
430 | |
431 | @item @emph{C/C++}: | |
432 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 433 | @item @emph{Prototype}: @tab @code{int omp_get_max_threads(void);} |
3721b9e1 DF |
434 | @end multitable |
435 | ||
436 | @item @emph{Fortran}: | |
437 | @multitable @columnfractions .20 .80 | |
438 | @item @emph{Interface}: @tab @code{integer function omp_get_max_threads()} | |
439 | @end multitable | |
440 | ||
441 | @item @emph{See also}: | |
5c6ed53a | 442 | @ref{omp_set_num_threads}, @ref{omp_set_dynamic}, @ref{omp_get_thread_limit} |
3721b9e1 DF |
443 | |
444 | @item @emph{Reference}: | |
00b9bd52 | 445 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.3. |
3721b9e1 DF |
446 | @end table |
447 | ||
448 | ||
449 | ||
450 | @node omp_get_nested | |
451 | @section @code{omp_get_nested} -- Nested parallel regions | |
452 | @table @asis | |
453 | @item @emph{Description}: | |
454 | This function returns @code{true} if nested parallel regions are | |
83fd6c5b | 455 | enabled, @code{false} otherwise. Here, @code{true} and @code{false} |
3721b9e1 DF |
456 | represent their language-specific counterparts. |
457 | ||
14734fc7 | 458 | Nested parallel regions may be initialized at startup by the |
83fd6c5b TB |
459 | @env{OMP_NESTED} environment variable or at runtime using |
460 | @code{omp_set_nested}. If undefined, nested parallel regions are | |
14734fc7 DF |
461 | disabled by default. |
462 | ||
3721b9e1 DF |
463 | @item @emph{C/C++}: |
464 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 465 | @item @emph{Prototype}: @tab @code{int omp_get_nested(void);} |
3721b9e1 DF |
466 | @end multitable |
467 | ||
468 | @item @emph{Fortran}: | |
469 | @multitable @columnfractions .20 .80 | |
87350d4a | 470 | @item @emph{Interface}: @tab @code{logical function omp_get_nested()} |
3721b9e1 DF |
471 | @end multitable |
472 | ||
473 | @item @emph{See also}: | |
14734fc7 | 474 | @ref{omp_set_nested}, @ref{OMP_NESTED} |
3721b9e1 DF |
475 | |
476 | @item @emph{Reference}: | |
00b9bd52 | 477 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.11. |
83fd6c5b TB |
478 | @end table |
479 | ||
480 | ||
481 | ||
482 | @node omp_get_num_devices | |
483 | @section @code{omp_get_num_devices} -- Number of target devices | |
484 | @table @asis | |
485 | @item @emph{Description}: | |
486 | Returns the number of target devices. | |
487 | ||
488 | @item @emph{C/C++}: | |
489 | @multitable @columnfractions .20 .80 | |
490 | @item @emph{Prototype}: @tab @code{int omp_get_num_devices(void);} | |
491 | @end multitable | |
492 | ||
493 | @item @emph{Fortran}: | |
494 | @multitable @columnfractions .20 .80 | |
495 | @item @emph{Interface}: @tab @code{integer function omp_get_num_devices()} | |
496 | @end multitable | |
497 | ||
498 | @item @emph{Reference}: | |
00b9bd52 | 499 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.31. |
3721b9e1 DF |
500 | @end table |
501 | ||
502 | ||
503 | ||
504 | @node omp_get_num_procs | |
505 | @section @code{omp_get_num_procs} -- Number of processors online | |
506 | @table @asis | |
507 | @item @emph{Description}: | |
83fd6c5b | 508 | Returns the number of processors online on that device. |
3721b9e1 DF |
509 | |
510 | @item @emph{C/C++}: | |
511 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 512 | @item @emph{Prototype}: @tab @code{int omp_get_num_procs(void);} |
3721b9e1 DF |
513 | @end multitable |
514 | ||
515 | @item @emph{Fortran}: | |
516 | @multitable @columnfractions .20 .80 | |
517 | @item @emph{Interface}: @tab @code{integer function omp_get_num_procs()} | |
518 | @end multitable | |
519 | ||
520 | @item @emph{Reference}: | |
00b9bd52 | 521 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.5. |
83fd6c5b TB |
522 | @end table |
523 | ||
524 | ||
525 | ||
526 | @node omp_get_num_teams | |
527 | @section @code{omp_get_num_teams} -- Number of teams | |
528 | @table @asis | |
529 | @item @emph{Description}: | |
530 | Returns the number of teams in the current team region. | |
531 | ||
532 | @item @emph{C/C++}: | |
533 | @multitable @columnfractions .20 .80 | |
534 | @item @emph{Prototype}: @tab @code{int omp_get_num_teams(void);} | |
535 | @end multitable | |
536 | ||
537 | @item @emph{Fortran}: | |
538 | @multitable @columnfractions .20 .80 | |
539 | @item @emph{Interface}: @tab @code{integer function omp_get_num_teams()} | |
540 | @end multitable | |
541 | ||
542 | @item @emph{Reference}: | |
00b9bd52 | 543 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.32. |
3721b9e1 DF |
544 | @end table |
545 | ||
546 | ||
547 | ||
548 | @node omp_get_num_threads | |
549 | @section @code{omp_get_num_threads} -- Size of the active team | |
550 | @table @asis | |
551 | @item @emph{Description}: | |
83fd6c5b | 552 | Returns the number of threads in the current team. In a sequential section of |
3721b9e1 DF |
553 | the program @code{omp_get_num_threads} returns 1. |
554 | ||
14734fc7 | 555 | The default team size may be initialized at startup by the |
83fd6c5b | 556 | @env{OMP_NUM_THREADS} environment variable. At runtime, the size |
14734fc7 | 557 | of the current team may be set either by the @code{NUM_THREADS} |
83fd6c5b TB |
558 | clause or by @code{omp_set_num_threads}. If none of the above were |
559 | used to define a specific value and @env{OMP_DYNAMIC} is disabled, | |
14734fc7 DF |
560 | one thread per CPU online is used. |
561 | ||
3721b9e1 DF |
562 | @item @emph{C/C++}: |
563 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 564 | @item @emph{Prototype}: @tab @code{int omp_get_num_threads(void);} |
3721b9e1 DF |
565 | @end multitable |
566 | ||
567 | @item @emph{Fortran}: | |
568 | @multitable @columnfractions .20 .80 | |
569 | @item @emph{Interface}: @tab @code{integer function omp_get_num_threads()} | |
570 | @end multitable | |
571 | ||
572 | @item @emph{See also}: | |
573 | @ref{omp_get_max_threads}, @ref{omp_set_num_threads}, @ref{OMP_NUM_THREADS} | |
574 | ||
575 | @item @emph{Reference}: | |
00b9bd52 | 576 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.2. |
83fd6c5b TB |
577 | @end table |
578 | ||
579 | ||
580 | ||
581 | @node omp_get_proc_bind | |
582 | @section @code{omp_get_proc_bind} -- Whether theads may be moved between CPUs | |
583 | @table @asis | |
584 | @item @emph{Description}: | |
585 | This functions returns the currently active thread affinity policy, which is | |
586 | set via @env{OMP_PROC_BIND}. Possible values are @code{omp_proc_bind_false}, | |
587 | @code{omp_proc_bind_true}, @code{omp_proc_bind_master}, | |
588 | @code{omp_proc_bind_close} and @code{omp_proc_bind_spread}. | |
589 | ||
590 | @item @emph{C/C++}: | |
591 | @multitable @columnfractions .20 .80 | |
592 | @item @emph{Prototype}: @tab @code{omp_proc_bind_t omp_get_proc_bind(void);} | |
593 | @end multitable | |
594 | ||
595 | @item @emph{Fortran}: | |
596 | @multitable @columnfractions .20 .80 | |
597 | @item @emph{Interface}: @tab @code{integer(kind=omp_proc_bind_kind) function omp_get_proc_bind()} | |
598 | @end multitable | |
599 | ||
600 | @item @emph{See also}: | |
601 | @ref{OMP_PROC_BIND}, @ref{OMP_PLACES}, @ref{GOMP_CPU_AFFINITY}, | |
602 | ||
603 | @item @emph{Reference}: | |
00b9bd52 | 604 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.22. |
5c6ed53a TB |
605 | @end table |
606 | ||
607 | ||
608 | ||
609 | @node omp_get_schedule | |
610 | @section @code{omp_get_schedule} -- Obtain the runtime scheduling method | |
611 | @table @asis | |
612 | @item @emph{Description}: | |
83fd6c5b | 613 | Obtain the runtime scheduling method. The @var{kind} argument will be |
5c6ed53a | 614 | set to the value @code{omp_sched_static}, @code{omp_sched_dynamic}, |
83fd6c5b | 615 | @code{omp_sched_guided} or @code{omp_sched_auto}. The second argument, |
d9a6bd32 | 616 | @var{chunk_size}, is set to the chunk size. |
5c6ed53a TB |
617 | |
618 | @item @emph{C/C++} | |
619 | @multitable @columnfractions .20 .80 | |
d9a6bd32 | 620 | @item @emph{Prototype}: @tab @code{void omp_get_schedule(omp_sched_t *kind, int *chunk_size);} |
5c6ed53a TB |
621 | @end multitable |
622 | ||
623 | @item @emph{Fortran}: | |
624 | @multitable @columnfractions .20 .80 | |
d9a6bd32 | 625 | @item @emph{Interface}: @tab @code{subroutine omp_get_schedule(kind, chunk_size)} |
5c6ed53a | 626 | @item @tab @code{integer(kind=omp_sched_kind) kind} |
d9a6bd32 | 627 | @item @tab @code{integer chunk_size} |
5c6ed53a TB |
628 | @end multitable |
629 | ||
630 | @item @emph{See also}: | |
631 | @ref{omp_set_schedule}, @ref{OMP_SCHEDULE} | |
632 | ||
633 | @item @emph{Reference}: | |
00b9bd52 | 634 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.13. |
83fd6c5b TB |
635 | @end table |
636 | ||
637 | ||
638 | ||
639 | @node omp_get_team_num | |
640 | @section @code{omp_get_team_num} -- Get team number | |
641 | @table @asis | |
642 | @item @emph{Description}: | |
643 | Returns the team number of the calling thread. | |
644 | ||
645 | @item @emph{C/C++}: | |
646 | @multitable @columnfractions .20 .80 | |
647 | @item @emph{Prototype}: @tab @code{int omp_get_team_num(void);} | |
648 | @end multitable | |
649 | ||
650 | @item @emph{Fortran}: | |
651 | @multitable @columnfractions .20 .80 | |
652 | @item @emph{Interface}: @tab @code{integer function omp_get_team_num()} | |
653 | @end multitable | |
654 | ||
655 | @item @emph{Reference}: | |
00b9bd52 | 656 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.33. |
5c6ed53a TB |
657 | @end table |
658 | ||
659 | ||
660 | ||
661 | @node omp_get_team_size | |
662 | @section @code{omp_get_team_size} -- Number of threads in a team | |
663 | @table @asis | |
664 | @item @emph{Description}: | |
665 | This function returns the number of threads in a thread team to which | |
83fd6c5b | 666 | either the current thread or its ancestor belongs. For values of @var{level} |
6a2ba183 AH |
667 | outside zero to @code{omp_get_level}, -1 is returned; if @var{level} is zero, |
668 | 1 is returned, and for @code{omp_get_level}, the result is identical | |
5c6ed53a TB |
669 | to @code{omp_get_num_threads}. |
670 | ||
671 | @item @emph{C/C++}: | |
672 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 673 | @item @emph{Prototype}: @tab @code{int omp_get_team_size(int level);} |
5c6ed53a TB |
674 | @end multitable |
675 | ||
676 | @item @emph{Fortran}: | |
677 | @multitable @columnfractions .20 .80 | |
678 | @item @emph{Interface}: @tab @code{integer function omp_get_team_size(level)} | |
679 | @item @tab @code{integer level} | |
680 | @end multitable | |
681 | ||
682 | @item @emph{See also}: | |
683 | @ref{omp_get_num_threads}, @ref{omp_get_level}, @ref{omp_get_ancestor_thread_num} | |
684 | ||
685 | @item @emph{Reference}: | |
00b9bd52 | 686 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.19. |
5c6ed53a TB |
687 | @end table |
688 | ||
689 | ||
690 | ||
691 | @node omp_get_thread_limit | |
6a2ba183 | 692 | @section @code{omp_get_thread_limit} -- Maximum number of threads |
5c6ed53a TB |
693 | @table @asis |
694 | @item @emph{Description}: | |
6a2ba183 | 695 | Return the maximum number of threads of the program. |
5c6ed53a TB |
696 | |
697 | @item @emph{C/C++}: | |
698 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 699 | @item @emph{Prototype}: @tab @code{int omp_get_thread_limit(void);} |
5c6ed53a TB |
700 | @end multitable |
701 | ||
702 | @item @emph{Fortran}: | |
703 | @multitable @columnfractions .20 .80 | |
704 | @item @emph{Interface}: @tab @code{integer function omp_get_thread_limit()} | |
705 | @end multitable | |
706 | ||
707 | @item @emph{See also}: | |
708 | @ref{omp_get_max_threads}, @ref{OMP_THREAD_LIMIT} | |
709 | ||
710 | @item @emph{Reference}: | |
00b9bd52 | 711 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.14. |
3721b9e1 DF |
712 | @end table |
713 | ||
714 | ||
715 | ||
83fd6c5b | 716 | @node omp_get_thread_num |
3721b9e1 DF |
717 | @section @code{omp_get_thread_num} -- Current thread ID |
718 | @table @asis | |
719 | @item @emph{Description}: | |
6a2ba183 | 720 | Returns a unique thread identification number within the current team. |
5c6ed53a | 721 | In a sequential parts of the program, @code{omp_get_thread_num} |
83fd6c5b TB |
722 | always returns 0. In parallel regions the return value varies |
723 | from 0 to @code{omp_get_num_threads}-1 inclusive. The return | |
3721b9e1 DF |
724 | value of the master thread of a team is always 0. |
725 | ||
726 | @item @emph{C/C++}: | |
727 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 728 | @item @emph{Prototype}: @tab @code{int omp_get_thread_num(void);} |
3721b9e1 DF |
729 | @end multitable |
730 | ||
731 | @item @emph{Fortran}: | |
732 | @multitable @columnfractions .20 .80 | |
733 | @item @emph{Interface}: @tab @code{integer function omp_get_thread_num()} | |
734 | @end multitable | |
735 | ||
736 | @item @emph{See also}: | |
5c6ed53a | 737 | @ref{omp_get_num_threads}, @ref{omp_get_ancestor_thread_num} |
3721b9e1 DF |
738 | |
739 | @item @emph{Reference}: | |
00b9bd52 | 740 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.4. |
3721b9e1 DF |
741 | @end table |
742 | ||
743 | ||
744 | ||
745 | @node omp_in_parallel | |
746 | @section @code{omp_in_parallel} -- Whether a parallel region is active | |
747 | @table @asis | |
748 | @item @emph{Description}: | |
83fd6c5b TB |
749 | This function returns @code{true} if currently running in parallel, |
750 | @code{false} otherwise. Here, @code{true} and @code{false} represent | |
3721b9e1 DF |
751 | their language-specific counterparts. |
752 | ||
753 | @item @emph{C/C++}: | |
754 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 755 | @item @emph{Prototype}: @tab @code{int omp_in_parallel(void);} |
3721b9e1 DF |
756 | @end multitable |
757 | ||
758 | @item @emph{Fortran}: | |
759 | @multitable @columnfractions .20 .80 | |
760 | @item @emph{Interface}: @tab @code{logical function omp_in_parallel()} | |
761 | @end multitable | |
762 | ||
763 | @item @emph{Reference}: | |
00b9bd52 | 764 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.6. |
20906c66 JJ |
765 | @end table |
766 | ||
767 | ||
768 | @node omp_in_final | |
769 | @section @code{omp_in_final} -- Whether in final or included task region | |
770 | @table @asis | |
771 | @item @emph{Description}: | |
772 | This function returns @code{true} if currently running in a final | |
83fd6c5b | 773 | or included task region, @code{false} otherwise. Here, @code{true} |
20906c66 JJ |
774 | and @code{false} represent their language-specific counterparts. |
775 | ||
776 | @item @emph{C/C++}: | |
777 | @multitable @columnfractions .20 .80 | |
778 | @item @emph{Prototype}: @tab @code{int omp_in_final(void);} | |
779 | @end multitable | |
780 | ||
781 | @item @emph{Fortran}: | |
782 | @multitable @columnfractions .20 .80 | |
783 | @item @emph{Interface}: @tab @code{logical function omp_in_final()} | |
784 | @end multitable | |
785 | ||
786 | @item @emph{Reference}: | |
00b9bd52 | 787 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.21. |
3721b9e1 DF |
788 | @end table |
789 | ||
790 | ||
83fd6c5b TB |
791 | |
792 | @node omp_is_initial_device | |
793 | @section @code{omp_is_initial_device} -- Whether executing on the host device | |
794 | @table @asis | |
795 | @item @emph{Description}: | |
796 | This function returns @code{true} if currently running on the host device, | |
797 | @code{false} otherwise. Here, @code{true} and @code{false} represent | |
798 | their language-specific counterparts. | |
799 | ||
800 | @item @emph{C/C++}: | |
801 | @multitable @columnfractions .20 .80 | |
802 | @item @emph{Prototype}: @tab @code{int omp_is_initial_device(void);} | |
803 | @end multitable | |
804 | ||
805 | @item @emph{Fortran}: | |
806 | @multitable @columnfractions .20 .80 | |
807 | @item @emph{Interface}: @tab @code{logical function omp_is_initial_device()} | |
808 | @end multitable | |
809 | ||
810 | @item @emph{Reference}: | |
00b9bd52 | 811 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.34. |
83fd6c5b TB |
812 | @end table |
813 | ||
814 | ||
815 | ||
816 | @node omp_set_default_device | |
817 | @section @code{omp_set_default_device} -- Set the default device for target regions | |
818 | @table @asis | |
819 | @item @emph{Description}: | |
820 | Set the default device for target regions without device clause. The argument | |
821 | shall be a nonnegative device number. | |
822 | ||
823 | @item @emph{C/C++}: | |
824 | @multitable @columnfractions .20 .80 | |
825 | @item @emph{Prototype}: @tab @code{void omp_set_default_device(int device_num);} | |
826 | @end multitable | |
827 | ||
828 | @item @emph{Fortran}: | |
829 | @multitable @columnfractions .20 .80 | |
830 | @item @emph{Interface}: @tab @code{subroutine omp_set_default_device(device_num)} | |
831 | @item @tab @code{integer device_num} | |
832 | @end multitable | |
833 | ||
834 | @item @emph{See also}: | |
835 | @ref{OMP_DEFAULT_DEVICE}, @ref{omp_get_default_device} | |
836 | ||
837 | @item @emph{Reference}: | |
00b9bd52 | 838 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.29. |
83fd6c5b TB |
839 | @end table |
840 | ||
841 | ||
842 | ||
3721b9e1 DF |
843 | @node omp_set_dynamic |
844 | @section @code{omp_set_dynamic} -- Enable/disable dynamic teams | |
845 | @table @asis | |
846 | @item @emph{Description}: | |
847 | Enable or disable the dynamic adjustment of the number of threads | |
83fd6c5b | 848 | within a team. The function takes the language-specific equivalent |
3721b9e1 DF |
849 | of @code{true} and @code{false}, where @code{true} enables dynamic |
850 | adjustment of team sizes and @code{false} disables it. | |
851 | ||
852 | @item @emph{C/C++}: | |
853 | @multitable @columnfractions .20 .80 | |
4fed6b25 | 854 | @item @emph{Prototype}: @tab @code{void omp_set_dynamic(int dynamic_threads);} |
3721b9e1 DF |
855 | @end multitable |
856 | ||
857 | @item @emph{Fortran}: | |
858 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
859 | @item @emph{Interface}: @tab @code{subroutine omp_set_dynamic(dynamic_threads)} |
860 | @item @tab @code{logical, intent(in) :: dynamic_threads} | |
3721b9e1 DF |
861 | @end multitable |
862 | ||
863 | @item @emph{See also}: | |
864 | @ref{OMP_DYNAMIC}, @ref{omp_get_dynamic} | |
865 | ||
866 | @item @emph{Reference}: | |
00b9bd52 | 867 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.7. |
5c6ed53a TB |
868 | @end table |
869 | ||
870 | ||
871 | ||
872 | @node omp_set_max_active_levels | |
873 | @section @code{omp_set_max_active_levels} -- Limits the number of active parallel regions | |
874 | @table @asis | |
875 | @item @emph{Description}: | |
6a2ba183 AH |
876 | This function limits the maximum allowed number of nested, active |
877 | parallel regions. | |
5c6ed53a TB |
878 | |
879 | @item @emph{C/C++} | |
880 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 881 | @item @emph{Prototype}: @tab @code{void omp_set_max_active_levels(int max_levels);} |
5c6ed53a TB |
882 | @end multitable |
883 | ||
884 | @item @emph{Fortran}: | |
885 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 886 | @item @emph{Interface}: @tab @code{subroutine omp_set_max_active_levels(max_levels)} |
5c6ed53a TB |
887 | @item @tab @code{integer max_levels} |
888 | @end multitable | |
889 | ||
890 | @item @emph{See also}: | |
891 | @ref{omp_get_max_active_levels}, @ref{omp_get_active_level} | |
892 | ||
893 | @item @emph{Reference}: | |
00b9bd52 | 894 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.15. |
3721b9e1 DF |
895 | @end table |
896 | ||
897 | ||
898 | ||
899 | @node omp_set_nested | |
900 | @section @code{omp_set_nested} -- Enable/disable nested parallel regions | |
901 | @table @asis | |
902 | @item @emph{Description}: | |
f1b0882e | 903 | Enable or disable nested parallel regions, i.e., whether team members |
83fd6c5b | 904 | are allowed to create new teams. The function takes the language-specific |
3721b9e1 DF |
905 | equivalent of @code{true} and @code{false}, where @code{true} enables |
906 | dynamic adjustment of team sizes and @code{false} disables it. | |
907 | ||
908 | @item @emph{C/C++}: | |
909 | @multitable @columnfractions .20 .80 | |
4fed6b25 | 910 | @item @emph{Prototype}: @tab @code{void omp_set_nested(int nested);} |
3721b9e1 DF |
911 | @end multitable |
912 | ||
913 | @item @emph{Fortran}: | |
914 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
915 | @item @emph{Interface}: @tab @code{subroutine omp_set_nested(nested)} |
916 | @item @tab @code{logical, intent(in) :: nested} | |
3721b9e1 DF |
917 | @end multitable |
918 | ||
919 | @item @emph{See also}: | |
920 | @ref{OMP_NESTED}, @ref{omp_get_nested} | |
921 | ||
922 | @item @emph{Reference}: | |
00b9bd52 | 923 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.10. |
3721b9e1 DF |
924 | @end table |
925 | ||
926 | ||
927 | ||
928 | @node omp_set_num_threads | |
929 | @section @code{omp_set_num_threads} -- Set upper team size limit | |
930 | @table @asis | |
931 | @item @emph{Description}: | |
932 | Specifies the number of threads used by default in subsequent parallel | |
83fd6c5b TB |
933 | sections, if those do not specify a @code{num_threads} clause. The |
934 | argument of @code{omp_set_num_threads} shall be a positive integer. | |
3721b9e1 | 935 | |
3721b9e1 DF |
936 | @item @emph{C/C++}: |
937 | @multitable @columnfractions .20 .80 | |
4fed6b25 | 938 | @item @emph{Prototype}: @tab @code{void omp_set_num_threads(int num_threads);} |
3721b9e1 DF |
939 | @end multitable |
940 | ||
941 | @item @emph{Fortran}: | |
942 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
943 | @item @emph{Interface}: @tab @code{subroutine omp_set_num_threads(num_threads)} |
944 | @item @tab @code{integer, intent(in) :: num_threads} | |
3721b9e1 DF |
945 | @end multitable |
946 | ||
947 | @item @emph{See also}: | |
948 | @ref{OMP_NUM_THREADS}, @ref{omp_get_num_threads}, @ref{omp_get_max_threads} | |
949 | ||
950 | @item @emph{Reference}: | |
00b9bd52 | 951 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.1. |
5c6ed53a TB |
952 | @end table |
953 | ||
954 | ||
955 | ||
956 | @node omp_set_schedule | |
957 | @section @code{omp_set_schedule} -- Set the runtime scheduling method | |
958 | @table @asis | |
959 | @item @emph{Description}: | |
83fd6c5b | 960 | Sets the runtime scheduling method. The @var{kind} argument can have the |
5c6ed53a | 961 | value @code{omp_sched_static}, @code{omp_sched_dynamic}, |
83fd6c5b | 962 | @code{omp_sched_guided} or @code{omp_sched_auto}. Except for |
5c6ed53a | 963 | @code{omp_sched_auto}, the chunk size is set to the value of |
d9a6bd32 JJ |
964 | @var{chunk_size} if positive, or to the default value if zero or negative. |
965 | For @code{omp_sched_auto} the @var{chunk_size} argument is ignored. | |
5c6ed53a TB |
966 | |
967 | @item @emph{C/C++} | |
968 | @multitable @columnfractions .20 .80 | |
d9a6bd32 | 969 | @item @emph{Prototype}: @tab @code{void omp_set_schedule(omp_sched_t kind, int chunk_size);} |
5c6ed53a TB |
970 | @end multitable |
971 | ||
972 | @item @emph{Fortran}: | |
973 | @multitable @columnfractions .20 .80 | |
d9a6bd32 | 974 | @item @emph{Interface}: @tab @code{subroutine omp_set_schedule(kind, chunk_size)} |
5c6ed53a | 975 | @item @tab @code{integer(kind=omp_sched_kind) kind} |
d9a6bd32 | 976 | @item @tab @code{integer chunk_size} |
5c6ed53a TB |
977 | @end multitable |
978 | ||
979 | @item @emph{See also}: | |
980 | @ref{omp_get_schedule} | |
981 | @ref{OMP_SCHEDULE} | |
982 | ||
983 | @item @emph{Reference}: | |
00b9bd52 | 984 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.2.12. |
3721b9e1 DF |
985 | @end table |
986 | ||
987 | ||
988 | ||
989 | @node omp_init_lock | |
990 | @section @code{omp_init_lock} -- Initialize simple lock | |
991 | @table @asis | |
992 | @item @emph{Description}: | |
83fd6c5b | 993 | Initialize a simple lock. After initialization, the lock is in |
3721b9e1 DF |
994 | an unlocked state. |
995 | ||
996 | @item @emph{C/C++}: | |
997 | @multitable @columnfractions .20 .80 | |
998 | @item @emph{Prototype}: @tab @code{void omp_init_lock(omp_lock_t *lock);} | |
999 | @end multitable | |
1000 | ||
1001 | @item @emph{Fortran}: | |
1002 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
1003 | @item @emph{Interface}: @tab @code{subroutine omp_init_lock(svar)} |
1004 | @item @tab @code{integer(omp_lock_kind), intent(out) :: svar} | |
3721b9e1 DF |
1005 | @end multitable |
1006 | ||
1007 | @item @emph{See also}: | |
1008 | @ref{omp_destroy_lock} | |
1009 | ||
1010 | @item @emph{Reference}: | |
00b9bd52 | 1011 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.3.1. |
3721b9e1 DF |
1012 | @end table |
1013 | ||
1014 | ||
1015 | ||
1016 | @node omp_set_lock | |
1017 | @section @code{omp_set_lock} -- Wait for and set simple lock | |
1018 | @table @asis | |
1019 | @item @emph{Description}: | |
1020 | Before setting a simple lock, the lock variable must be initialized by | |
83fd6c5b TB |
1021 | @code{omp_init_lock}. The calling thread is blocked until the lock |
1022 | is available. If the lock is already held by the current thread, | |
3721b9e1 DF |
1023 | a deadlock occurs. |
1024 | ||
1025 | @item @emph{C/C++}: | |
1026 | @multitable @columnfractions .20 .80 | |
1027 | @item @emph{Prototype}: @tab @code{void omp_set_lock(omp_lock_t *lock);} | |
1028 | @end multitable | |
1029 | ||
1030 | @item @emph{Fortran}: | |
1031 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
1032 | @item @emph{Interface}: @tab @code{subroutine omp_set_lock(svar)} |
1033 | @item @tab @code{integer(omp_lock_kind), intent(inout) :: svar} | |
3721b9e1 DF |
1034 | @end multitable |
1035 | ||
1036 | @item @emph{See also}: | |
1037 | @ref{omp_init_lock}, @ref{omp_test_lock}, @ref{omp_unset_lock} | |
1038 | ||
1039 | @item @emph{Reference}: | |
00b9bd52 | 1040 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.3.4. |
3721b9e1 DF |
1041 | @end table |
1042 | ||
1043 | ||
1044 | ||
1045 | @node omp_test_lock | |
1046 | @section @code{omp_test_lock} -- Test and set simple lock if available | |
1047 | @table @asis | |
1048 | @item @emph{Description}: | |
1049 | Before setting a simple lock, the lock variable must be initialized by | |
83fd6c5b TB |
1050 | @code{omp_init_lock}. Contrary to @code{omp_set_lock}, @code{omp_test_lock} |
1051 | does not block if the lock is not available. This function returns | |
1052 | @code{true} upon success, @code{false} otherwise. Here, @code{true} and | |
3721b9e1 DF |
1053 | @code{false} represent their language-specific counterparts. |
1054 | ||
1055 | @item @emph{C/C++}: | |
1056 | @multitable @columnfractions .20 .80 | |
1057 | @item @emph{Prototype}: @tab @code{int omp_test_lock(omp_lock_t *lock);} | |
1058 | @end multitable | |
1059 | ||
1060 | @item @emph{Fortran}: | |
1061 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
1062 | @item @emph{Interface}: @tab @code{logical function omp_test_lock(svar)} |
1063 | @item @tab @code{integer(omp_lock_kind), intent(inout) :: svar} | |
3721b9e1 DF |
1064 | @end multitable |
1065 | ||
1066 | @item @emph{See also}: | |
1067 | @ref{omp_init_lock}, @ref{omp_set_lock}, @ref{omp_set_lock} | |
1068 | ||
1069 | @item @emph{Reference}: | |
00b9bd52 | 1070 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.3.6. |
3721b9e1 DF |
1071 | @end table |
1072 | ||
1073 | ||
1074 | ||
1075 | @node omp_unset_lock | |
1076 | @section @code{omp_unset_lock} -- Unset simple lock | |
1077 | @table @asis | |
1078 | @item @emph{Description}: | |
1079 | A simple lock about to be unset must have been locked by @code{omp_set_lock} | |
83fd6c5b TB |
1080 | or @code{omp_test_lock} before. In addition, the lock must be held by the |
1081 | thread calling @code{omp_unset_lock}. Then, the lock becomes unlocked. If one | |
1082 | or more threads attempted to set the lock before, one of them is chosen to, | |
20906c66 | 1083 | again, set the lock to itself. |
3721b9e1 DF |
1084 | |
1085 | @item @emph{C/C++}: | |
1086 | @multitable @columnfractions .20 .80 | |
1087 | @item @emph{Prototype}: @tab @code{void omp_unset_lock(omp_lock_t *lock);} | |
1088 | @end multitable | |
1089 | ||
1090 | @item @emph{Fortran}: | |
1091 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
1092 | @item @emph{Interface}: @tab @code{subroutine omp_unset_lock(svar)} |
1093 | @item @tab @code{integer(omp_lock_kind), intent(inout) :: svar} | |
3721b9e1 DF |
1094 | @end multitable |
1095 | ||
1096 | @item @emph{See also}: | |
1097 | @ref{omp_set_lock}, @ref{omp_test_lock} | |
1098 | ||
1099 | @item @emph{Reference}: | |
00b9bd52 | 1100 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.3.5. |
3721b9e1 DF |
1101 | @end table |
1102 | ||
1103 | ||
1104 | ||
1105 | @node omp_destroy_lock | |
1106 | @section @code{omp_destroy_lock} -- Destroy simple lock | |
1107 | @table @asis | |
1108 | @item @emph{Description}: | |
83fd6c5b | 1109 | Destroy a simple lock. In order to be destroyed, a simple lock must be |
3721b9e1 DF |
1110 | in the unlocked state. |
1111 | ||
1112 | @item @emph{C/C++}: | |
1113 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 1114 | @item @emph{Prototype}: @tab @code{void omp_destroy_lock(omp_lock_t *lock);} |
3721b9e1 DF |
1115 | @end multitable |
1116 | ||
1117 | @item @emph{Fortran}: | |
1118 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
1119 | @item @emph{Interface}: @tab @code{subroutine omp_destroy_lock(svar)} |
1120 | @item @tab @code{integer(omp_lock_kind), intent(inout) :: svar} | |
3721b9e1 DF |
1121 | @end multitable |
1122 | ||
1123 | @item @emph{See also}: | |
1124 | @ref{omp_init_lock} | |
1125 | ||
1126 | @item @emph{Reference}: | |
00b9bd52 | 1127 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.3.3. |
3721b9e1 DF |
1128 | @end table |
1129 | ||
1130 | ||
1131 | ||
1132 | @node omp_init_nest_lock | |
1133 | @section @code{omp_init_nest_lock} -- Initialize nested lock | |
1134 | @table @asis | |
1135 | @item @emph{Description}: | |
83fd6c5b | 1136 | Initialize a nested lock. After initialization, the lock is in |
3721b9e1 DF |
1137 | an unlocked state and the nesting count is set to zero. |
1138 | ||
1139 | @item @emph{C/C++}: | |
1140 | @multitable @columnfractions .20 .80 | |
1141 | @item @emph{Prototype}: @tab @code{void omp_init_nest_lock(omp_nest_lock_t *lock);} | |
1142 | @end multitable | |
1143 | ||
1144 | @item @emph{Fortran}: | |
1145 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
1146 | @item @emph{Interface}: @tab @code{subroutine omp_init_nest_lock(nvar)} |
1147 | @item @tab @code{integer(omp_nest_lock_kind), intent(out) :: nvar} | |
3721b9e1 DF |
1148 | @end multitable |
1149 | ||
1150 | @item @emph{See also}: | |
1151 | @ref{omp_destroy_nest_lock} | |
1152 | ||
1153 | @item @emph{Reference}: | |
00b9bd52 | 1154 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.3.1. |
3721b9e1 DF |
1155 | @end table |
1156 | ||
1157 | ||
1158 | @node omp_set_nest_lock | |
6a2ba183 | 1159 | @section @code{omp_set_nest_lock} -- Wait for and set nested lock |
3721b9e1 DF |
1160 | @table @asis |
1161 | @item @emph{Description}: | |
1162 | Before setting a nested lock, the lock variable must be initialized by | |
83fd6c5b TB |
1163 | @code{omp_init_nest_lock}. The calling thread is blocked until the lock |
1164 | is available. If the lock is already held by the current thread, the | |
20906c66 | 1165 | nesting count for the lock is incremented. |
3721b9e1 DF |
1166 | |
1167 | @item @emph{C/C++}: | |
1168 | @multitable @columnfractions .20 .80 | |
1169 | @item @emph{Prototype}: @tab @code{void omp_set_nest_lock(omp_nest_lock_t *lock);} | |
1170 | @end multitable | |
1171 | ||
1172 | @item @emph{Fortran}: | |
1173 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
1174 | @item @emph{Interface}: @tab @code{subroutine omp_set_nest_lock(nvar)} |
1175 | @item @tab @code{integer(omp_nest_lock_kind), intent(inout) :: nvar} | |
3721b9e1 DF |
1176 | @end multitable |
1177 | ||
1178 | @item @emph{See also}: | |
1179 | @ref{omp_init_nest_lock}, @ref{omp_unset_nest_lock} | |
1180 | ||
1181 | @item @emph{Reference}: | |
00b9bd52 | 1182 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.3.4. |
3721b9e1 DF |
1183 | @end table |
1184 | ||
1185 | ||
1186 | ||
1187 | @node omp_test_nest_lock | |
1188 | @section @code{omp_test_nest_lock} -- Test and set nested lock if available | |
1189 | @table @asis | |
1190 | @item @emph{Description}: | |
1191 | Before setting a nested lock, the lock variable must be initialized by | |
83fd6c5b | 1192 | @code{omp_init_nest_lock}. Contrary to @code{omp_set_nest_lock}, |
3721b9e1 DF |
1193 | @code{omp_test_nest_lock} does not block if the lock is not available. |
1194 | If the lock is already held by the current thread, the new nesting count | |
83fd6c5b | 1195 | is returned. Otherwise, the return value equals zero. |
3721b9e1 DF |
1196 | |
1197 | @item @emph{C/C++}: | |
1198 | @multitable @columnfractions .20 .80 | |
1199 | @item @emph{Prototype}: @tab @code{int omp_test_nest_lock(omp_nest_lock_t *lock);} | |
1200 | @end multitable | |
1201 | ||
1202 | @item @emph{Fortran}: | |
1203 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
1204 | @item @emph{Interface}: @tab @code{logical function omp_test_nest_lock(nvar)} |
1205 | @item @tab @code{integer(omp_nest_lock_kind), intent(inout) :: nvar} | |
3721b9e1 DF |
1206 | @end multitable |
1207 | ||
1208 | ||
1209 | @item @emph{See also}: | |
1210 | @ref{omp_init_lock}, @ref{omp_set_lock}, @ref{omp_set_lock} | |
1211 | ||
1212 | @item @emph{Reference}: | |
00b9bd52 | 1213 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.3.6. |
3721b9e1 DF |
1214 | @end table |
1215 | ||
1216 | ||
1217 | ||
1218 | @node omp_unset_nest_lock | |
1219 | @section @code{omp_unset_nest_lock} -- Unset nested lock | |
1220 | @table @asis | |
1221 | @item @emph{Description}: | |
1222 | A nested lock about to be unset must have been locked by @code{omp_set_nested_lock} | |
83fd6c5b TB |
1223 | or @code{omp_test_nested_lock} before. In addition, the lock must be held by the |
1224 | thread calling @code{omp_unset_nested_lock}. If the nesting count drops to zero, the | |
1225 | lock becomes unlocked. If one ore more threads attempted to set the lock before, | |
20906c66 | 1226 | one of them is chosen to, again, set the lock to itself. |
3721b9e1 DF |
1227 | |
1228 | @item @emph{C/C++}: | |
1229 | @multitable @columnfractions .20 .80 | |
1230 | @item @emph{Prototype}: @tab @code{void omp_unset_nest_lock(omp_nest_lock_t *lock);} | |
1231 | @end multitable | |
1232 | ||
1233 | @item @emph{Fortran}: | |
1234 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
1235 | @item @emph{Interface}: @tab @code{subroutine omp_unset_nest_lock(nvar)} |
1236 | @item @tab @code{integer(omp_nest_lock_kind), intent(inout) :: nvar} | |
3721b9e1 DF |
1237 | @end multitable |
1238 | ||
1239 | @item @emph{See also}: | |
1240 | @ref{omp_set_nest_lock} | |
1241 | ||
1242 | @item @emph{Reference}: | |
00b9bd52 | 1243 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.3.5. |
3721b9e1 DF |
1244 | @end table |
1245 | ||
1246 | ||
1247 | ||
1248 | @node omp_destroy_nest_lock | |
1249 | @section @code{omp_destroy_nest_lock} -- Destroy nested lock | |
1250 | @table @asis | |
1251 | @item @emph{Description}: | |
83fd6c5b | 1252 | Destroy a nested lock. In order to be destroyed, a nested lock must be |
3721b9e1 DF |
1253 | in the unlocked state and its nesting count must equal zero. |
1254 | ||
1255 | @item @emph{C/C++}: | |
1256 | @multitable @columnfractions .20 .80 | |
1257 | @item @emph{Prototype}: @tab @code{void omp_destroy_nest_lock(omp_nest_lock_t *);} | |
1258 | @end multitable | |
1259 | ||
1260 | @item @emph{Fortran}: | |
1261 | @multitable @columnfractions .20 .80 | |
4fed6b25 TB |
1262 | @item @emph{Interface}: @tab @code{subroutine omp_destroy_nest_lock(nvar)} |
1263 | @item @tab @code{integer(omp_nest_lock_kind), intent(inout) :: nvar} | |
3721b9e1 DF |
1264 | @end multitable |
1265 | ||
1266 | @item @emph{See also}: | |
1267 | @ref{omp_init_lock} | |
1268 | ||
1269 | @item @emph{Reference}: | |
00b9bd52 | 1270 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.3.3. |
3721b9e1 DF |
1271 | @end table |
1272 | ||
1273 | ||
1274 | ||
1275 | @node omp_get_wtick | |
1276 | @section @code{omp_get_wtick} -- Get timer precision | |
1277 | @table @asis | |
1278 | @item @emph{Description}: | |
f1b0882e | 1279 | Gets the timer precision, i.e., the number of seconds between two |
3721b9e1 DF |
1280 | successive clock ticks. |
1281 | ||
1282 | @item @emph{C/C++}: | |
1283 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 1284 | @item @emph{Prototype}: @tab @code{double omp_get_wtick(void);} |
3721b9e1 DF |
1285 | @end multitable |
1286 | ||
1287 | @item @emph{Fortran}: | |
1288 | @multitable @columnfractions .20 .80 | |
1289 | @item @emph{Interface}: @tab @code{double precision function omp_get_wtick()} | |
1290 | @end multitable | |
1291 | ||
1292 | @item @emph{See also}: | |
1293 | @ref{omp_get_wtime} | |
1294 | ||
1295 | @item @emph{Reference}: | |
00b9bd52 | 1296 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.4.2. |
3721b9e1 DF |
1297 | @end table |
1298 | ||
1299 | ||
1300 | ||
1301 | @node omp_get_wtime | |
1302 | @section @code{omp_get_wtime} -- Elapsed wall clock time | |
1303 | @table @asis | |
1304 | @item @emph{Description}: | |
83fd6c5b | 1305 | Elapsed wall clock time in seconds. The time is measured per thread, no |
6a2ba183 | 1306 | guarantee can be made that two distinct threads measure the same time. |
21e1e594 JJ |
1307 | Time is measured from some "time in the past", which is an arbitrary time |
1308 | guaranteed not to change during the execution of the program. | |
3721b9e1 DF |
1309 | |
1310 | @item @emph{C/C++}: | |
1311 | @multitable @columnfractions .20 .80 | |
6a2ba183 | 1312 | @item @emph{Prototype}: @tab @code{double omp_get_wtime(void);} |
3721b9e1 DF |
1313 | @end multitable |
1314 | ||
1315 | @item @emph{Fortran}: | |
1316 | @multitable @columnfractions .20 .80 | |
1317 | @item @emph{Interface}: @tab @code{double precision function omp_get_wtime()} | |
1318 | @end multitable | |
1319 | ||
1320 | @item @emph{See also}: | |
1321 | @ref{omp_get_wtick} | |
1322 | ||
1323 | @item @emph{Reference}: | |
00b9bd52 | 1324 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 3.4.1. |
3721b9e1 DF |
1325 | @end table |
1326 | ||
1327 | ||
1328 | ||
1329 | @c --------------------------------------------------------------------- | |
1330 | @c Environment Variables | |
1331 | @c --------------------------------------------------------------------- | |
1332 | ||
1333 | @node Environment Variables | |
1334 | @chapter Environment Variables | |
1335 | ||
acf0174b | 1336 | The environment variables which beginning with @env{OMP_} are defined by |
00b9bd52 | 1337 | section 4 of the OpenMP specification in version 4.5, while those |
acf0174b | 1338 | beginning with @env{GOMP_} are GNU extensions. |
3721b9e1 DF |
1339 | |
1340 | @menu | |
06441dd5 SH |
1341 | * OMP_CANCELLATION:: Set whether cancellation is activated |
1342 | * OMP_DISPLAY_ENV:: Show OpenMP version and environment variables | |
1343 | * OMP_DEFAULT_DEVICE:: Set the device used in target regions | |
1344 | * OMP_DYNAMIC:: Dynamic adjustment of threads | |
1345 | * OMP_MAX_ACTIVE_LEVELS:: Set the maximum number of nested parallel regions | |
d9a6bd32 | 1346 | * OMP_MAX_TASK_PRIORITY:: Set the maximum task priority value |
06441dd5 SH |
1347 | * OMP_NESTED:: Nested parallel regions |
1348 | * OMP_NUM_THREADS:: Specifies the number of threads to use | |
1349 | * OMP_PROC_BIND:: Whether theads may be moved between CPUs | |
1350 | * OMP_PLACES:: Specifies on which CPUs the theads should be placed | |
1351 | * OMP_STACKSIZE:: Set default thread stack size | |
1352 | * OMP_SCHEDULE:: How threads are scheduled | |
1353 | * OMP_THREAD_LIMIT:: Set the maximum number of threads | |
1354 | * OMP_WAIT_POLICY:: How waiting threads are handled | |
1355 | * GOMP_CPU_AFFINITY:: Bind threads to specific CPUs | |
1356 | * GOMP_DEBUG:: Enable debugging output | |
1357 | * GOMP_STACKSIZE:: Set default thread stack size | |
1358 | * GOMP_SPINCOUNT:: Set the busy-wait spin count | |
1359 | * GOMP_RTEMS_THREAD_POOLS:: Set the RTEMS specific thread pools | |
3721b9e1 DF |
1360 | @end menu |
1361 | ||
1362 | ||
83fd6c5b TB |
1363 | @node OMP_CANCELLATION |
1364 | @section @env{OMP_CANCELLATION} -- Set whether cancellation is activated | |
1365 | @cindex Environment Variable | |
1366 | @table @asis | |
1367 | @item @emph{Description}: | |
1368 | If set to @code{TRUE}, the cancellation is activated. If set to @code{FALSE} or | |
1369 | if unset, cancellation is disabled and the @code{cancel} construct is ignored. | |
1370 | ||
1371 | @item @emph{See also}: | |
1372 | @ref{omp_get_cancellation} | |
1373 | ||
1374 | @item @emph{Reference}: | |
00b9bd52 | 1375 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.11 |
83fd6c5b TB |
1376 | @end table |
1377 | ||
1378 | ||
1379 | ||
1380 | @node OMP_DISPLAY_ENV | |
1381 | @section @env{OMP_DISPLAY_ENV} -- Show OpenMP version and environment variables | |
1382 | @cindex Environment Variable | |
1383 | @table @asis | |
1384 | @item @emph{Description}: | |
1385 | If set to @code{TRUE}, the OpenMP version number and the values | |
1386 | associated with the OpenMP environment variables are printed to @code{stderr}. | |
1387 | If set to @code{VERBOSE}, it additionally shows the value of the environment | |
1388 | variables which are GNU extensions. If undefined or set to @code{FALSE}, | |
1389 | this information will not be shown. | |
1390 | ||
1391 | ||
1392 | @item @emph{Reference}: | |
00b9bd52 | 1393 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.12 |
83fd6c5b TB |
1394 | @end table |
1395 | ||
1396 | ||
1397 | ||
1398 | @node OMP_DEFAULT_DEVICE | |
1399 | @section @env{OMP_DEFAULT_DEVICE} -- Set the device used in target regions | |
1400 | @cindex Environment Variable | |
1401 | @table @asis | |
1402 | @item @emph{Description}: | |
1403 | Set to choose the device which is used in a @code{target} region, unless the | |
1404 | value is overridden by @code{omp_set_default_device} or by a @code{device} | |
1405 | clause. The value shall be the nonnegative device number. If no device with | |
1406 | the given device number exists, the code is executed on the host. If unset, | |
1407 | device number 0 will be used. | |
1408 | ||
1409 | ||
1410 | @item @emph{See also}: | |
1411 | @ref{omp_get_default_device}, @ref{omp_set_default_device}, | |
1412 | ||
1413 | @item @emph{Reference}: | |
00b9bd52 | 1414 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.13 |
83fd6c5b TB |
1415 | @end table |
1416 | ||
1417 | ||
1418 | ||
3721b9e1 DF |
1419 | @node OMP_DYNAMIC |
1420 | @section @env{OMP_DYNAMIC} -- Dynamic adjustment of threads | |
1421 | @cindex Environment Variable | |
1422 | @table @asis | |
1423 | @item @emph{Description}: | |
1424 | Enable or disable the dynamic adjustment of the number of threads | |
83fd6c5b TB |
1425 | within a team. The value of this environment variable shall be |
1426 | @code{TRUE} or @code{FALSE}. If undefined, dynamic adjustment is | |
7c2b7f45 | 1427 | disabled by default. |
3721b9e1 DF |
1428 | |
1429 | @item @emph{See also}: | |
1430 | @ref{omp_set_dynamic} | |
1431 | ||
1432 | @item @emph{Reference}: | |
00b9bd52 | 1433 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.3 |
5c6ed53a TB |
1434 | @end table |
1435 | ||
1436 | ||
1437 | ||
1438 | @node OMP_MAX_ACTIVE_LEVELS | |
6a2ba183 | 1439 | @section @env{OMP_MAX_ACTIVE_LEVELS} -- Set the maximum number of nested parallel regions |
5c6ed53a TB |
1440 | @cindex Environment Variable |
1441 | @table @asis | |
1442 | @item @emph{Description}: | |
6a2ba183 | 1443 | Specifies the initial value for the maximum number of nested parallel |
83fd6c5b | 1444 | regions. The value of this variable shall be a positive integer. |
5c6ed53a TB |
1445 | If undefined, the number of active levels is unlimited. |
1446 | ||
1447 | @item @emph{See also}: | |
1448 | @ref{omp_set_max_active_levels} | |
1449 | ||
1450 | @item @emph{Reference}: | |
00b9bd52 | 1451 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.9 |
3721b9e1 DF |
1452 | @end table |
1453 | ||
1454 | ||
1455 | ||
d9a6bd32 JJ |
1456 | @node OMP_MAX_TASK_PRIORITY |
1457 | @section @env{OMP_MAX_TASK_PRIORITY} -- Set the maximum priority | |
1458 | number that can be set for a task. | |
1459 | @cindex Environment Variable | |
1460 | @table @asis | |
1461 | @item @emph{Description}: | |
1462 | Specifies the initial value for the maximum priority value that can be | |
1463 | set for a task. The value of this variable shall be a non-negative | |
1464 | integer, and zero is allowed. If undefined, the default priority is | |
1465 | 0. | |
1466 | ||
1467 | @item @emph{See also}: | |
1468 | @ref{omp_get_max_task_priority} | |
1469 | ||
1470 | @item @emph{Reference}: | |
1471 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.14 | |
1472 | @end table | |
1473 | ||
1474 | ||
1475 | ||
3721b9e1 DF |
1476 | @node OMP_NESTED |
1477 | @section @env{OMP_NESTED} -- Nested parallel regions | |
1478 | @cindex Environment Variable | |
14734fc7 | 1479 | @cindex Implementation specific setting |
3721b9e1 DF |
1480 | @table @asis |
1481 | @item @emph{Description}: | |
f1b0882e | 1482 | Enable or disable nested parallel regions, i.e., whether team members |
83fd6c5b TB |
1483 | are allowed to create new teams. The value of this environment variable |
1484 | shall be @code{TRUE} or @code{FALSE}. If undefined, nested parallel | |
7c2b7f45 | 1485 | regions are disabled by default. |
3721b9e1 DF |
1486 | |
1487 | @item @emph{See also}: | |
1488 | @ref{omp_set_nested} | |
1489 | ||
1490 | @item @emph{Reference}: | |
00b9bd52 | 1491 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.6 |
3721b9e1 DF |
1492 | @end table |
1493 | ||
1494 | ||
1495 | ||
1496 | @node OMP_NUM_THREADS | |
1497 | @section @env{OMP_NUM_THREADS} -- Specifies the number of threads to use | |
1498 | @cindex Environment Variable | |
14734fc7 | 1499 | @cindex Implementation specific setting |
3721b9e1 DF |
1500 | @table @asis |
1501 | @item @emph{Description}: | |
83fd6c5b | 1502 | Specifies the default number of threads to use in parallel regions. The |
20906c66 JJ |
1503 | value of this variable shall be a comma-separated list of positive integers; |
1504 | the value specified the number of threads to use for the corresponding nested | |
83fd6c5b | 1505 | level. If undefined one thread per CPU is used. |
3721b9e1 DF |
1506 | |
1507 | @item @emph{See also}: | |
1508 | @ref{omp_set_num_threads} | |
1509 | ||
1510 | @item @emph{Reference}: | |
00b9bd52 | 1511 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.2 |
83fd6c5b TB |
1512 | @end table |
1513 | ||
1514 | ||
1515 | ||
72832460 UB |
1516 | @node OMP_PROC_BIND |
1517 | @section @env{OMP_PROC_BIND} -- Whether theads may be moved between CPUs | |
1518 | @cindex Environment Variable | |
1519 | @table @asis | |
1520 | @item @emph{Description}: | |
1521 | Specifies whether threads may be moved between processors. If set to | |
1522 | @code{TRUE}, OpenMP theads should not be moved; if set to @code{FALSE} | |
1523 | they may be moved. Alternatively, a comma separated list with the | |
1524 | values @code{MASTER}, @code{CLOSE} and @code{SPREAD} can be used to specify | |
1525 | the thread affinity policy for the corresponding nesting level. With | |
1526 | @code{MASTER} the worker threads are in the same place partition as the | |
1527 | master thread. With @code{CLOSE} those are kept close to the master thread | |
1528 | in contiguous place partitions. And with @code{SPREAD} a sparse distribution | |
1529 | across the place partitions is used. | |
1530 | ||
1531 | When undefined, @env{OMP_PROC_BIND} defaults to @code{TRUE} when | |
1532 | @env{OMP_PLACES} or @env{GOMP_CPU_AFFINITY} is set and @code{FALSE} otherwise. | |
1533 | ||
1534 | @item @emph{See also}: | |
1535 | @ref{OMP_PLACES}, @ref{GOMP_CPU_AFFINITY}, @ref{omp_get_proc_bind} | |
1536 | ||
1537 | @item @emph{Reference}: | |
00b9bd52 | 1538 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.4 |
72832460 UB |
1539 | @end table |
1540 | ||
1541 | ||
1542 | ||
83fd6c5b TB |
1543 | @node OMP_PLACES |
1544 | @section @env{OMP_PLACES} -- Specifies on which CPUs the theads should be placed | |
1545 | @cindex Environment Variable | |
1546 | @table @asis | |
1547 | @item @emph{Description}: | |
1548 | The thread placement can be either specified using an abstract name or by an | |
1549 | explicit list of the places. The abstract names @code{threads}, @code{cores} | |
1550 | and @code{sockets} can be optionally followed by a positive number in | |
1551 | parentheses, which denotes the how many places shall be created. With | |
1552 | @code{threads} each place corresponds to a single hardware thread; @code{cores} | |
1553 | to a single core with the corresponding number of hardware threads; and with | |
1554 | @code{sockets} the place corresponds to a single socket. The resulting | |
1555 | placement can be shown by setting the @env{OMP_DISPLAY_ENV} environment | |
1556 | variable. | |
1557 | ||
1558 | Alternatively, the placement can be specified explicitly as comma-separated | |
1559 | list of places. A place is specified by set of nonnegative numbers in curly | |
1560 | braces, denoting the denoting the hardware threads. The hardware threads | |
1561 | belonging to a place can either be specified as comma-separated list of | |
1562 | nonnegative thread numbers or using an interval. Multiple places can also be | |
1563 | either specified by a comma-separated list of places or by an interval. To | |
1564 | specify an interval, a colon followed by the count is placed after after | |
1565 | the hardware thread number or the place. Optionally, the length can be | |
1566 | followed by a colon and the stride number -- otherwise a unit stride is | |
1567 | assumed. For instance, the following specifies the same places list: | |
1568 | @code{"@{0,1,2@}, @{3,4,6@}, @{7,8,9@}, @{10,11,12@}"}; | |
1569 | @code{"@{0:3@}, @{3:3@}, @{7:3@}, @{10:3@}"}; and @code{"@{0:2@}:4:3"}. | |
1570 | ||
1571 | If @env{OMP_PLACES} and @env{GOMP_CPU_AFFINITY} are unset and | |
1572 | @env{OMP_PROC_BIND} is either unset or @code{false}, threads may be moved | |
1573 | between CPUs following no placement policy. | |
1574 | ||
1575 | @item @emph{See also}: | |
1576 | @ref{OMP_PROC_BIND}, @ref{GOMP_CPU_AFFINITY}, @ref{omp_get_proc_bind}, | |
1577 | @ref{OMP_DISPLAY_ENV} | |
1578 | ||
1579 | @item @emph{Reference}: | |
00b9bd52 | 1580 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.5 |
83fd6c5b TB |
1581 | @end table |
1582 | ||
1583 | ||
1584 | ||
72832460 UB |
1585 | @node OMP_STACKSIZE |
1586 | @section @env{OMP_STACKSIZE} -- Set default thread stack size | |
83fd6c5b TB |
1587 | @cindex Environment Variable |
1588 | @table @asis | |
1589 | @item @emph{Description}: | |
72832460 UB |
1590 | Set the default thread stack size in kilobytes, unless the number |
1591 | is suffixed by @code{B}, @code{K}, @code{M} or @code{G}, in which | |
1592 | case the size is, respectively, in bytes, kilobytes, megabytes | |
1593 | or gigabytes. This is different from @code{pthread_attr_setstacksize} | |
1594 | which gets the number of bytes as an argument. If the stack size cannot | |
1595 | be set due to system constraints, an error is reported and the initial | |
1596 | stack size is left unchanged. If undefined, the stack size is system | |
1597 | dependent. | |
83fd6c5b | 1598 | |
72832460 | 1599 | @item @emph{Reference}: |
00b9bd52 | 1600 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.7 |
3721b9e1 DF |
1601 | @end table |
1602 | ||
1603 | ||
1604 | ||
1605 | @node OMP_SCHEDULE | |
1606 | @section @env{OMP_SCHEDULE} -- How threads are scheduled | |
1607 | @cindex Environment Variable | |
14734fc7 | 1608 | @cindex Implementation specific setting |
3721b9e1 DF |
1609 | @table @asis |
1610 | @item @emph{Description}: | |
1611 | Allows to specify @code{schedule type} and @code{chunk size}. | |
1612 | The value of the variable shall have the form: @code{type[,chunk]} where | |
5c6ed53a | 1613 | @code{type} is one of @code{static}, @code{dynamic}, @code{guided} or @code{auto} |
83fd6c5b | 1614 | The optional @code{chunk} size shall be a positive integer. If undefined, |
7c2b7f45 | 1615 | dynamic scheduling and a chunk size of 1 is used. |
3721b9e1 | 1616 | |
5c6ed53a TB |
1617 | @item @emph{See also}: |
1618 | @ref{omp_set_schedule} | |
1619 | ||
1620 | @item @emph{Reference}: | |
00b9bd52 | 1621 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Sections 2.7.1.1 and 4.1 |
5c6ed53a TB |
1622 | @end table |
1623 | ||
1624 | ||
1625 | ||
5c6ed53a | 1626 | @node OMP_THREAD_LIMIT |
6a2ba183 | 1627 | @section @env{OMP_THREAD_LIMIT} -- Set the maximum number of threads |
5c6ed53a TB |
1628 | @cindex Environment Variable |
1629 | @table @asis | |
1630 | @item @emph{Description}: | |
83fd6c5b TB |
1631 | Specifies the number of threads to use for the whole program. The |
1632 | value of this variable shall be a positive integer. If undefined, | |
5c6ed53a TB |
1633 | the number of threads is not limited. |
1634 | ||
1635 | @item @emph{See also}: | |
83fd6c5b | 1636 | @ref{OMP_NUM_THREADS}, @ref{omp_get_thread_limit} |
5c6ed53a TB |
1637 | |
1638 | @item @emph{Reference}: | |
00b9bd52 | 1639 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.10 |
5c6ed53a TB |
1640 | @end table |
1641 | ||
1642 | ||
1643 | ||
1644 | @node OMP_WAIT_POLICY | |
1645 | @section @env{OMP_WAIT_POLICY} -- How waiting threads are handled | |
1646 | @cindex Environment Variable | |
1647 | @table @asis | |
1648 | @item @emph{Description}: | |
83fd6c5b | 1649 | Specifies whether waiting threads should be active or passive. If |
5c6ed53a TB |
1650 | the value is @code{PASSIVE}, waiting threads should not consume CPU |
1651 | power while waiting; while the value is @code{ACTIVE} specifies that | |
83fd6c5b | 1652 | they should. If undefined, threads wait actively for a short time |
acf0174b JJ |
1653 | before waiting passively. |
1654 | ||
1655 | @item @emph{See also}: | |
1656 | @ref{GOMP_SPINCOUNT} | |
5c6ed53a TB |
1657 | |
1658 | @item @emph{Reference}: | |
00b9bd52 | 1659 | @uref{http://www.openmp.org/, OpenMP specification v4.5}, Section 4.8 |
3721b9e1 DF |
1660 | @end table |
1661 | ||
1662 | ||
1663 | ||
1664 | @node GOMP_CPU_AFFINITY | |
1665 | @section @env{GOMP_CPU_AFFINITY} -- Bind threads to specific CPUs | |
1666 | @cindex Environment Variable | |
1667 | @table @asis | |
1668 | @item @emph{Description}: | |
83fd6c5b TB |
1669 | Binds threads to specific CPUs. The variable should contain a space-separated |
1670 | or comma-separated list of CPUs. This list may contain different kinds of | |
06785a48 | 1671 | entries: either single CPU numbers in any order, a range of CPUs (M-N) |
83fd6c5b | 1672 | or a range with some stride (M-N:S). CPU numbers are zero based. For example, |
06785a48 DF |
1673 | @code{GOMP_CPU_AFFINITY="0 3 1-2 4-15:2"} will bind the initial thread |
1674 | to CPU 0, the second to CPU 3, the third to CPU 1, the fourth to | |
1675 | CPU 2, the fifth to CPU 4, the sixth through tenth to CPUs 6, 8, 10, 12, | |
1676 | and 14 respectively and then start assigning back from the beginning of | |
6a2ba183 | 1677 | the list. @code{GOMP_CPU_AFFINITY=0} binds all threads to CPU 0. |
06785a48 | 1678 | |
f1f3453e | 1679 | There is no libgomp library routine to determine whether a CPU affinity |
83fd6c5b | 1680 | specification is in effect. As a workaround, language-specific library |
06785a48 DF |
1681 | functions, e.g., @code{getenv} in C or @code{GET_ENVIRONMENT_VARIABLE} in |
1682 | Fortran, may be used to query the setting of the @code{GOMP_CPU_AFFINITY} | |
83fd6c5b | 1683 | environment variable. A defined CPU affinity on startup cannot be changed |
06785a48 DF |
1684 | or disabled during the runtime of the application. |
1685 | ||
83fd6c5b TB |
1686 | If both @env{GOMP_CPU_AFFINITY} and @env{OMP_PROC_BIND} are set, |
1687 | @env{OMP_PROC_BIND} has a higher precedence. If neither has been set and | |
1688 | @env{OMP_PROC_BIND} is unset, or when @env{OMP_PROC_BIND} is set to | |
1689 | @code{FALSE}, the host system will handle the assignment of threads to CPUs. | |
20906c66 JJ |
1690 | |
1691 | @item @emph{See also}: | |
83fd6c5b | 1692 | @ref{OMP_PLACES}, @ref{OMP_PROC_BIND} |
3721b9e1 DF |
1693 | @end table |
1694 | ||
1695 | ||
1696 | ||
41dbbb37 TS |
1697 | @node GOMP_DEBUG |
1698 | @section @env{GOMP_DEBUG} -- Enable debugging output | |
1699 | @cindex Environment Variable | |
1700 | @table @asis | |
1701 | @item @emph{Description}: | |
1702 | Enable debugging output. The variable should be set to @code{0} | |
1703 | (disabled, also the default if not set), or @code{1} (enabled). | |
1704 | ||
1705 | If enabled, some debugging output will be printed during execution. | |
1706 | This is currently not specified in more detail, and subject to change. | |
1707 | @end table | |
1708 | ||
1709 | ||
1710 | ||
3721b9e1 DF |
1711 | @node GOMP_STACKSIZE |
1712 | @section @env{GOMP_STACKSIZE} -- Set default thread stack size | |
1713 | @cindex Environment Variable | |
14734fc7 | 1714 | @cindex Implementation specific setting |
3721b9e1 DF |
1715 | @table @asis |
1716 | @item @emph{Description}: | |
83fd6c5b | 1717 | Set the default thread stack size in kilobytes. This is different from |
5c6ed53a | 1718 | @code{pthread_attr_setstacksize} which gets the number of bytes as an |
83fd6c5b TB |
1719 | argument. If the stack size cannot be set due to system constraints, an |
1720 | error is reported and the initial stack size is left unchanged. If undefined, | |
7c2b7f45 | 1721 | the stack size is system dependent. |
3721b9e1 | 1722 | |
5c6ed53a | 1723 | @item @emph{See also}: |
0024f1af | 1724 | @ref{OMP_STACKSIZE} |
5c6ed53a | 1725 | |
3721b9e1 DF |
1726 | @item @emph{Reference}: |
1727 | @uref{http://gcc.gnu.org/ml/gcc-patches/2006-06/msg00493.html, | |
1728 | GCC Patches Mailinglist}, | |
1729 | @uref{http://gcc.gnu.org/ml/gcc-patches/2006-06/msg00496.html, | |
1730 | GCC Patches Mailinglist} | |
1731 | @end table | |
1732 | ||
1733 | ||
1734 | ||
acf0174b JJ |
1735 | @node GOMP_SPINCOUNT |
1736 | @section @env{GOMP_SPINCOUNT} -- Set the busy-wait spin count | |
1737 | @cindex Environment Variable | |
1738 | @cindex Implementation specific setting | |
1739 | @table @asis | |
1740 | @item @emph{Description}: | |
1741 | Determines how long a threads waits actively with consuming CPU power | |
83fd6c5b | 1742 | before waiting passively without consuming CPU power. The value may be |
acf0174b | 1743 | either @code{INFINITE}, @code{INFINITY} to always wait actively or an |
83fd6c5b | 1744 | integer which gives the number of spins of the busy-wait loop. The |
acf0174b JJ |
1745 | integer may optionally be followed by the following suffixes acting |
1746 | as multiplication factors: @code{k} (kilo, thousand), @code{M} (mega, | |
1747 | million), @code{G} (giga, billion), or @code{T} (tera, trillion). | |
1748 | If undefined, 0 is used when @env{OMP_WAIT_POLICY} is @code{PASSIVE}, | |
1749 | 300,000 is used when @env{OMP_WAIT_POLICY} is undefined and | |
1750 | 30 billion is used when @env{OMP_WAIT_POLICY} is @code{ACTIVE}. | |
1751 | If there are more OpenMP threads than available CPUs, 1000 and 100 | |
1752 | spins are used for @env{OMP_WAIT_POLICY} being @code{ACTIVE} or | |
1753 | undefined, respectively; unless the @env{GOMP_SPINCOUNT} is lower | |
1754 | or @env{OMP_WAIT_POLICY} is @code{PASSIVE}. | |
1755 | ||
1756 | @item @emph{See also}: | |
1757 | @ref{OMP_WAIT_POLICY} | |
1758 | @end table | |
1759 | ||
1760 | ||
1761 | ||
06441dd5 SH |
1762 | @node GOMP_RTEMS_THREAD_POOLS |
1763 | @section @env{GOMP_RTEMS_THREAD_POOLS} -- Set the RTEMS specific thread pools | |
1764 | @cindex Environment Variable | |
1765 | @cindex Implementation specific setting | |
1766 | @table @asis | |
1767 | @item @emph{Description}: | |
1768 | This environment variable is only used on the RTEMS real-time operating system. | |
1769 | It determines the scheduler instance specific thread pools. The format for | |
1770 | @env{GOMP_RTEMS_THREAD_POOLS} is a list of optional | |
1771 | @code{<thread-pool-count>[$<priority>]@@<scheduler-name>} configurations | |
1772 | separated by @code{:} where: | |
1773 | @itemize @bullet | |
1774 | @item @code{<thread-pool-count>} is the thread pool count for this scheduler | |
1775 | instance. | |
1776 | @item @code{$<priority>} is an optional priority for the worker threads of a | |
1777 | thread pool according to @code{pthread_setschedparam}. In case a priority | |
1778 | value is omitted, then a worker thread will inherit the priority of the OpenMP | |
1779 | master thread that created it. The priority of the worker thread is not | |
1780 | changed after creation, even if a new OpenMP master thread using the worker has | |
1781 | a different priority. | |
1782 | @item @code{@@<scheduler-name>} is the scheduler instance name according to the | |
1783 | RTEMS application configuration. | |
1784 | @end itemize | |
1785 | In case no thread pool configuration is specified for a scheduler instance, | |
1786 | then each OpenMP master thread of this scheduler instance will use its own | |
1787 | dynamically allocated thread pool. To limit the worker thread count of the | |
1788 | thread pools, each OpenMP master thread must call @code{omp_set_num_threads}. | |
1789 | @item @emph{Example}: | |
1790 | Lets suppose we have three scheduler instances @code{IO}, @code{WRK0}, and | |
1791 | @code{WRK1} with @env{GOMP_RTEMS_THREAD_POOLS} set to | |
1792 | @code{"1@@WRK0:3$4@@WRK1"}. Then there are no thread pool restrictions for | |
1793 | scheduler instance @code{IO}. In the scheduler instance @code{WRK0} there is | |
1794 | one thread pool available. Since no priority is specified for this scheduler | |
1795 | instance, the worker thread inherits the priority of the OpenMP master thread | |
1796 | that created it. In the scheduler instance @code{WRK1} there are three thread | |
1797 | pools available and their worker threads run at priority four. | |
1798 | @end table | |
1799 | ||
1800 | ||
1801 | ||
cdf6119d JN |
1802 | @c --------------------------------------------------------------------- |
1803 | @c Enabling OpenACC | |
1804 | @c --------------------------------------------------------------------- | |
1805 | ||
1806 | @node Enabling OpenACC | |
1807 | @chapter Enabling OpenACC | |
1808 | ||
1809 | To activate the OpenACC extensions for C/C++ and Fortran, the compile-time | |
1810 | flag @option{-fopenacc} must be specified. This enables the OpenACC directive | |
1811 | @code{#pragma acc} in C/C++ and @code{!$accp} directives in free form, | |
1812 | @code{c$acc}, @code{*$acc} and @code{!$acc} directives in fixed form, | |
1813 | @code{!$} conditional compilation sentinels in free form and @code{c$}, | |
1814 | @code{*$} and @code{!$} sentinels in fixed form, for Fortran. The flag also | |
1815 | arranges for automatic linking of the OpenACC runtime library | |
1816 | (@ref{OpenACC Runtime Library Routines}). | |
1817 | ||
1818 | A complete description of all OpenACC directives accepted may be found in | |
1819 | the @uref{http://www.openacc.org/, OpenACC} Application Programming | |
1820 | Interface manual, version 2.0. | |
1821 | ||
1822 | Note that this is an experimental feature and subject to | |
1823 | change in future versions of GCC. See | |
1824 | @uref{https://gcc.gnu.org/wiki/OpenACC} for more information. | |
1825 | ||
1826 | ||
1827 | ||
1828 | @c --------------------------------------------------------------------- | |
1829 | @c OpenACC Runtime Library Routines | |
1830 | @c --------------------------------------------------------------------- | |
1831 | ||
1832 | @node OpenACC Runtime Library Routines | |
1833 | @chapter OpenACC Runtime Library Routines | |
1834 | ||
1835 | The runtime routines described here are defined by section 3 of the OpenACC | |
1836 | specifications in version 2.0. | |
1837 | They have C linkage, and do not throw exceptions. | |
1838 | Generally, they are available only for the host, with the exception of | |
1839 | @code{acc_on_device}, which is available for both the host and the | |
1840 | acceleration device. | |
1841 | ||
1842 | @menu | |
1843 | * acc_get_num_devices:: Get number of devices for the given device | |
1844 | type. | |
1845 | * acc_set_device_type:: Set type of device accelerator to use. | |
1846 | * acc_get_device_type:: Get type of device accelerator to be used. | |
1847 | * acc_set_device_num:: Set device number to use. | |
1848 | * acc_get_device_num:: Get device number to be used. | |
1849 | * acc_async_test:: Tests for completion of a specific asynchronous | |
1850 | operation. | |
1851 | * acc_async_test_all:: Tests for completion of all asychronous | |
1852 | operations. | |
1853 | * acc_wait:: Wait for completion of a specific asynchronous | |
1854 | operation. | |
1855 | * acc_wait_all:: Waits for completion of all asyncrhonous | |
1856 | operations. | |
1857 | * acc_wait_all_async:: Wait for completion of all asynchronous | |
1858 | operations. | |
1859 | * acc_wait_async:: Wait for completion of asynchronous operations. | |
1860 | * acc_init:: Initialize runtime for a specific device type. | |
1861 | * acc_shutdown:: Shuts down the runtime for a specific device | |
1862 | type. | |
1863 | * acc_on_device:: Whether executing on a particular device | |
1864 | * acc_malloc:: Allocate device memory. | |
1865 | * acc_free:: Free device memory. | |
1866 | * acc_copyin:: Allocate device memory and copy host memory to | |
1867 | it. | |
1868 | * acc_present_or_copyin:: If the data is not present on the device, | |
1869 | allocate device memory and copy from host | |
1870 | memory. | |
1871 | * acc_create:: Allocate device memory and map it to host | |
1872 | memory. | |
1873 | * acc_present_or_create:: If the data is not present on the device, | |
1874 | allocate device memory and map it to host | |
1875 | memory. | |
1876 | * acc_copyout:: Copy device memory to host memory. | |
1877 | * acc_delete:: Free device memory. | |
1878 | * acc_update_device:: Update device memory from mapped host memory. | |
1879 | * acc_update_self:: Update host memory from mapped device memory. | |
1880 | * acc_map_data:: Map previously allocated device memory to host | |
1881 | memory. | |
1882 | * acc_unmap_data:: Unmap device memory from host memory. | |
1883 | * acc_deviceptr:: Get device pointer associated with specific | |
1884 | host address. | |
1885 | * acc_hostptr:: Get host pointer associated with specific | |
1886 | device address. | |
1887 | * acc_is_present:: Indiciate whether host variable / array is | |
1888 | present on device. | |
1889 | * acc_memcpy_to_device:: Copy host memory to device memory. | |
1890 | * acc_memcpy_from_device:: Copy device memory to host memory. | |
1891 | ||
1892 | API routines for target platforms. | |
1893 | ||
1894 | * acc_get_current_cuda_device:: Get CUDA device handle. | |
1895 | * acc_get_current_cuda_context::Get CUDA context handle. | |
1896 | * acc_get_cuda_stream:: Get CUDA stream handle. | |
1897 | * acc_set_cuda_stream:: Set CUDA stream handle. | |
1898 | @end menu | |
1899 | ||
1900 | ||
1901 | ||
1902 | @node acc_get_num_devices | |
1903 | @section @code{acc_get_num_devices} -- Get number of devices for given device type | |
1904 | @table @asis | |
1905 | @item @emph{Description} | |
1906 | This function returns a value indicating the number of devices available | |
1907 | for the device type specified in @var{devicetype}. | |
1908 | ||
1909 | @item @emph{C/C++}: | |
1910 | @multitable @columnfractions .20 .80 | |
1911 | @item @emph{Prototype}: @tab @code{int acc_get_num_devices(acc_device_t devicetype);} | |
1912 | @end multitable | |
1913 | ||
1914 | @item @emph{Fortran}: | |
1915 | @multitable @columnfractions .20 .80 | |
1916 | @item @emph{Interface}: @tab @code{integer function acc_get_num_devices(devicetype)} | |
1917 | @item @tab @code{integer(kind=acc_device_kind) devicetype} | |
1918 | @end multitable | |
1919 | ||
1920 | @item @emph{Reference}: | |
1921 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
1922 | 3.2.1. | |
1923 | @end table | |
1924 | ||
1925 | ||
1926 | ||
1927 | @node acc_set_device_type | |
1928 | @section @code{acc_set_device_type} -- Set type of device accelerator to use. | |
1929 | @table @asis | |
1930 | @item @emph{Description} | |
1931 | This function indicates to the runtime library which device typr, specified | |
1932 | in @var{devicetype}, to use when executing a parallel or kernels region. | |
1933 | ||
1934 | @item @emph{C/C++}: | |
1935 | @multitable @columnfractions .20 .80 | |
1936 | @item @emph{Prototype}: @tab @code{acc_set_device_type(acc_device_t devicetype);} | |
1937 | @end multitable | |
1938 | ||
1939 | @item @emph{Fortran}: | |
1940 | @multitable @columnfractions .20 .80 | |
1941 | @item @emph{Interface}: @tab @code{subroutine acc_set_device_type(devicetype)} | |
1942 | @item @tab @code{integer(kind=acc_device_kind) devicetype} | |
1943 | @end multitable | |
1944 | ||
1945 | @item @emph{Reference}: | |
1946 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
1947 | 3.2.2. | |
1948 | @end table | |
1949 | ||
1950 | ||
1951 | ||
1952 | @node acc_get_device_type | |
1953 | @section @code{acc_get_device_type} -- Get type of device accelerator to be used. | |
1954 | @table @asis | |
1955 | @item @emph{Description} | |
1956 | This function returns what device type will be used when executing a | |
1957 | parallel or kernels region. | |
1958 | ||
1959 | @item @emph{C/C++}: | |
1960 | @multitable @columnfractions .20 .80 | |
1961 | @item @emph{Prototype}: @tab @code{acc_device_t acc_get_device_type(void);} | |
1962 | @end multitable | |
1963 | ||
1964 | @item @emph{Fortran}: | |
1965 | @multitable @columnfractions .20 .80 | |
1966 | @item @emph{Interface}: @tab @code{function acc_get_device_type(void)} | |
1967 | @item @tab @code{integer(kind=acc_device_kind) acc_get_device_type} | |
1968 | @end multitable | |
1969 | ||
1970 | @item @emph{Reference}: | |
1971 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
1972 | 3.2.3. | |
1973 | @end table | |
1974 | ||
1975 | ||
1976 | ||
1977 | @node acc_set_device_num | |
1978 | @section @code{acc_set_device_num} -- Set device number to use. | |
1979 | @table @asis | |
1980 | @item @emph{Description} | |
1981 | This function will indicate to the runtime which device number, | |
1982 | specified by @var{num}, associated with the specifed device | |
1983 | type @var{devicetype}. | |
1984 | ||
1985 | @item @emph{C/C++}: | |
1986 | @multitable @columnfractions .20 .80 | |
1987 | @item @emph{Prototype}: @tab @code{acc_set_device_num(int num, acc_device_t devicetype);} | |
1988 | @end multitable | |
1989 | ||
1990 | @item @emph{Fortran}: | |
1991 | @multitable @columnfractions .20 .80 | |
1992 | @item @emph{Interface}: @tab @code{subroutine acc_set_device_num(devicenum, devicetype)} | |
1993 | @item @tab @code{integer devicenum} | |
1994 | @item @tab @code{integer(kind=acc_device_kind) devicetype} | |
1995 | @end multitable | |
1996 | ||
1997 | @item @emph{Reference}: | |
1998 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
1999 | 3.2.4. | |
2000 | @end table | |
2001 | ||
2002 | ||
2003 | ||
2004 | @node acc_get_device_num | |
2005 | @section @code{acc_get_device_num} -- Get device number to be used. | |
2006 | @table @asis | |
2007 | @item @emph{Description} | |
2008 | This function returns which device number associated with the specified device | |
2009 | type @var{devicetype}, will be used when executing a parallel or kernels | |
2010 | region. | |
2011 | ||
2012 | @item @emph{C/C++}: | |
2013 | @multitable @columnfractions .20 .80 | |
2014 | @item @emph{Prototype}: @tab @code{int acc_get_device_num(acc_device_t devicetype);} | |
2015 | @end multitable | |
2016 | ||
2017 | @item @emph{Fortran}: | |
2018 | @multitable @columnfractions .20 .80 | |
2019 | @item @emph{Interface}: @tab @code{function acc_get_device_num(devicetype)} | |
2020 | @item @tab @code{integer(kind=acc_device_kind) devicetype} | |
2021 | @item @tab @code{integer acc_get_device_num} | |
2022 | @end multitable | |
2023 | ||
2024 | @item @emph{Reference}: | |
2025 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2026 | 3.2.5. | |
2027 | @end table | |
2028 | ||
2029 | ||
2030 | ||
2031 | @node acc_async_test | |
2032 | @section @code{acc_async_test} -- Test for completion of a specific asynchronous operation. | |
2033 | @table @asis | |
2034 | @item @emph{Description} | |
2035 | This function tests for completion of the asynchrounous operation specified | |
2036 | in @var{arg}. In C/C++, a non-zero value will be returned to indicate | |
2037 | the specified asynchronous operation has completed. While Fortran will return | |
2038 | a @code{true}. If the asynchrounous operation has not completed, C/C++ returns | |
2039 | a zero and Fortran returns a @code{false}. | |
2040 | ||
2041 | @item @emph{C/C++}: | |
2042 | @multitable @columnfractions .20 .80 | |
2043 | @item @emph{Prototype}: @tab @code{int acc_async_test(int arg);} | |
2044 | @end multitable | |
2045 | ||
2046 | @item @emph{Fortran}: | |
2047 | @multitable @columnfractions .20 .80 | |
2048 | @item @emph{Interface}: @tab @code{function acc_async_test(arg)} | |
2049 | @item @tab @code{integer(kind=acc_handle_kind) arg} | |
2050 | @item @tab @code{logical acc_async_test} | |
2051 | @end multitable | |
2052 | ||
2053 | @item @emph{Reference}: | |
2054 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2055 | 3.2.6. | |
2056 | @end table | |
2057 | ||
2058 | ||
2059 | ||
2060 | @node acc_async_test_all | |
2061 | @section @code{acc_async_test_all} -- Tests for completion of all asynchronous operations. | |
2062 | @table @asis | |
2063 | @item @emph{Description} | |
2064 | This function tests for completion of all asynchrounous operations. | |
2065 | In C/C++, a non-zero value will be returned to indicate all asynchronous | |
2066 | operations have completed. While Fortran will return a @code{true}. If | |
2067 | any asynchronous operation has not completed, C/C++ returns a zero and | |
2068 | Fortran returns a @code{false}. | |
2069 | ||
2070 | @item @emph{C/C++}: | |
2071 | @multitable @columnfractions .20 .80 | |
2072 | @item @emph{Prototype}: @tab @code{int acc_async_test_all(void);} | |
2073 | @end multitable | |
2074 | ||
2075 | @item @emph{Fortran}: | |
2076 | @multitable @columnfractions .20 .80 | |
2077 | @item @emph{Interface}: @tab @code{function acc_async_test()} | |
2078 | @item @tab @code{logical acc_get_device_num} | |
2079 | @end multitable | |
2080 | ||
2081 | @item @emph{Reference}: | |
2082 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2083 | 3.2.7. | |
2084 | @end table | |
2085 | ||
2086 | ||
2087 | ||
2088 | @node acc_wait | |
2089 | @section @code{acc_wait} -- Wait for completion of a specific asynchronous operation. | |
2090 | @table @asis | |
2091 | @item @emph{Description} | |
2092 | This function waits for completion of the asynchronous operation | |
2093 | specified in @var{arg}. | |
2094 | ||
2095 | @item @emph{C/C++}: | |
2096 | @multitable @columnfractions .20 .80 | |
2097 | @item @emph{Prototype}: @tab @code{acc_wait(arg);} | |
2098 | @end multitable | |
2099 | ||
2100 | @item @emph{Fortran}: | |
2101 | @multitable @columnfractions .20 .80 | |
2102 | @item @emph{Interface}: @tab @code{subroutine acc_wait(arg)} | |
2103 | @item @tab @code{integer(acc_handle_kind) arg} | |
2104 | @end multitable | |
2105 | ||
2106 | @item @emph{Reference}: | |
2107 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2108 | 3.2.8. | |
2109 | @end table | |
2110 | ||
2111 | ||
2112 | ||
2113 | @node acc_wait_all | |
2114 | @section @code{acc_wait_all} -- Waits for completion of all asynchronous operations. | |
2115 | @table @asis | |
2116 | @item @emph{Description} | |
2117 | This function waits for the completion of all asynchronous operations. | |
2118 | ||
2119 | @item @emph{C/C++}: | |
2120 | @multitable @columnfractions .20 .80 | |
2121 | @item @emph{Prototype}: @tab @code{acc_wait_all(void);} | |
2122 | @end multitable | |
2123 | ||
2124 | @item @emph{Fortran}: | |
2125 | @multitable @columnfractions .20 .80 | |
2126 | @item @emph{Interface}: @tab @code{subroutine acc_wait_async()} | |
2127 | @end multitable | |
2128 | ||
2129 | @item @emph{Reference}: | |
2130 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2131 | 3.2.10. | |
2132 | @end table | |
2133 | ||
2134 | ||
2135 | ||
2136 | @node acc_wait_all_async | |
2137 | @section @code{acc_wait_all_async} -- Wait for completion of all asynchronous operations. | |
2138 | @table @asis | |
2139 | @item @emph{Description} | |
2140 | This function enqueues a wait operation on the queue @var{async} for any | |
2141 | and all asynchronous operations that have been previously enqueued on | |
2142 | any queue. | |
2143 | ||
2144 | @item @emph{C/C++}: | |
2145 | @multitable @columnfractions .20 .80 | |
2146 | @item @emph{Prototype}: @tab @code{acc_wait_all_async(int async);} | |
2147 | @end multitable | |
2148 | ||
2149 | @item @emph{Fortran}: | |
2150 | @multitable @columnfractions .20 .80 | |
2151 | @item @emph{Interface}: @tab @code{subroutine acc_wait_all_async(async)} | |
2152 | @item @tab @code{integer(acc_handle_kind) async} | |
2153 | @end multitable | |
2154 | ||
2155 | @item @emph{Reference}: | |
2156 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2157 | 3.2.11. | |
2158 | @end table | |
2159 | ||
2160 | ||
2161 | ||
2162 | @node acc_wait_async | |
2163 | @section @code{acc_wait_async} -- Wait for completion of asynchronous operations. | |
2164 | @table @asis | |
2165 | @item @emph{Description} | |
2166 | This function enqueues a wait operation on queue @var{async} for any and all | |
2167 | asynchronous operations enqueued on queue @var{arg}. | |
2168 | ||
2169 | @item @emph{C/C++}: | |
2170 | @multitable @columnfractions .20 .80 | |
2171 | @item @emph{Prototype}: @tab @code{acc_wait_async(int arg, int async);} | |
2172 | @end multitable | |
2173 | ||
2174 | @item @emph{Fortran}: | |
2175 | @multitable @columnfractions .20 .80 | |
2176 | @item @emph{Interface}: @tab @code{subroutine acc_wait_async(arg, async)} | |
2177 | @item @tab @code{integer(acc_handle_kind) arg, async} | |
2178 | @end multitable | |
2179 | ||
2180 | @item @emph{Reference}: | |
2181 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2182 | 3.2.9. | |
2183 | @end table | |
2184 | ||
2185 | ||
2186 | ||
2187 | @node acc_init | |
2188 | @section @code{acc_init} -- Initialize runtime for a specific device type. | |
2189 | @table @asis | |
2190 | @item @emph{Description} | |
2191 | This function initializes the runtime for the device type specified in | |
2192 | @var{devicetype}. | |
2193 | ||
2194 | @item @emph{C/C++}: | |
2195 | @multitable @columnfractions .20 .80 | |
2196 | @item @emph{Prototype}: @tab @code{acc_init(acc_device_t devicetype);} | |
2197 | @end multitable | |
2198 | ||
2199 | @item @emph{Fortran}: | |
2200 | @multitable @columnfractions .20 .80 | |
2201 | @item @emph{Interface}: @tab @code{subroutine acc_init(devicetype)} | |
2202 | @item @tab @code{integer(acc_device_kind) devicetype} | |
2203 | @end multitable | |
2204 | ||
2205 | @item @emph{Reference}: | |
2206 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2207 | 3.2.12. | |
2208 | @end table | |
2209 | ||
2210 | ||
2211 | ||
2212 | @node acc_shutdown | |
2213 | @section @code{acc_shutdown} -- Shuts down the runtime for a specific device type. | |
2214 | @table @asis | |
2215 | @item @emph{Description} | |
2216 | This function shuts down the runtime for the device type specified in | |
2217 | @var{devicetype}. | |
2218 | ||
2219 | @item @emph{C/C++}: | |
2220 | @multitable @columnfractions .20 .80 | |
2221 | @item @emph{Prototype}: @tab @code{acc_shutdown(acc_device_t devicetype);} | |
2222 | @end multitable | |
2223 | ||
2224 | @item @emph{Fortran}: | |
2225 | @multitable @columnfractions .20 .80 | |
2226 | @item @emph{Interface}: @tab @code{subroutine acc_shutdown(devicetype)} | |
2227 | @item @tab @code{integer(acc_device_kind) devicetype} | |
2228 | @end multitable | |
2229 | ||
2230 | @item @emph{Reference}: | |
2231 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2232 | 3.2.13. | |
2233 | @end table | |
2234 | ||
2235 | ||
2236 | ||
2237 | @node acc_on_device | |
2238 | @section @code{acc_on_device} -- Whether executing on a particular device | |
2239 | @table @asis | |
2240 | @item @emph{Description}: | |
2241 | This function returns whether the program is executing on a particular | |
2242 | device specified in @var{devicetype}. In C/C++ a non-zero value is | |
2243 | returned to indicate the device is execiting on the specified device type. | |
2244 | In Fortran, @code{true} will be returned. If the program is not executing | |
2245 | on the specified device type C/C++ will return a zero, while Fortran will | |
2246 | return @code{false}. | |
2247 | ||
2248 | @item @emph{C/C++}: | |
2249 | @multitable @columnfractions .20 .80 | |
2250 | @item @emph{Prototype}: @tab @code{acc_on_device(acc_device_t devicetype);} | |
2251 | @end multitable | |
2252 | ||
2253 | @item @emph{Fortran}: | |
2254 | @multitable @columnfractions .20 .80 | |
2255 | @item @emph{Interface}: @tab @code{function acc_on_device(devicetype)} | |
2256 | @item @tab @code{integer(acc_device_kind) devicetype} | |
2257 | @item @tab @code{logical acc_on_device} | |
2258 | @end multitable | |
2259 | ||
2260 | ||
2261 | @item @emph{Reference}: | |
2262 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2263 | 3.2.14. | |
2264 | @end table | |
2265 | ||
2266 | ||
2267 | ||
2268 | @node acc_malloc | |
2269 | @section @code{acc_malloc} -- Allocate device memory. | |
2270 | @table @asis | |
2271 | @item @emph{Description} | |
2272 | This function allocates @var{len} bytes of device memory. It returns | |
2273 | the device address of the allocated memory. | |
2274 | ||
2275 | @item @emph{C/C++}: | |
2276 | @multitable @columnfractions .20 .80 | |
2277 | @item @emph{Prototype}: @tab @code{d_void* acc_malloc(size_t len);} | |
2278 | @end multitable | |
2279 | ||
2280 | @item @emph{Reference}: | |
2281 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2282 | 3.2.15. | |
2283 | @end table | |
2284 | ||
2285 | ||
2286 | ||
2287 | @node acc_free | |
2288 | @section @code{acc_free} -- Free device memory. | |
2289 | @table @asis | |
2290 | @item @emph{Description} | |
2291 | Free previously allocated device memory at the device address @code{a}. | |
2292 | ||
2293 | @item @emph{C/C++}: | |
2294 | @multitable @columnfractions .20 .80 | |
2295 | @item @emph{Prototype}: @tab @code{acc_free(d_void *a);} | |
2296 | @end multitable | |
2297 | ||
2298 | @item @emph{Reference}: | |
2299 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2300 | 3.2.16. | |
2301 | @end table | |
2302 | ||
2303 | ||
2304 | ||
2305 | @node acc_copyin | |
2306 | @section @code{acc_copyin} -- Allocate device memory and copy host memory to it. | |
2307 | @table @asis | |
2308 | @item @emph{Description} | |
2309 | In C/C++, this function allocates @var{len} bytes of device memory | |
2310 | and maps it to the specified host address in @var{a}. The device | |
2311 | address of the newly allocated device memory is returned. | |
2312 | ||
2313 | In Fortran, two (2) forms are supported. In the first form, @var{a} specifies | |
2314 | a contiguous array section. The second form @var{a} specifies a | |
2315 | variable or array element and @var{len} specifies the length in bytes. | |
2316 | ||
2317 | @item @emph{C/C++}: | |
2318 | @multitable @columnfractions .20 .80 | |
2319 | @item @emph{Prototype}: @tab @code{void *acc_copyin(h_void *a, size_t len);} | |
2320 | @end multitable | |
2321 | ||
2322 | @item @emph{Fortran}: | |
2323 | @multitable @columnfractions .20 .80 | |
2324 | @item @emph{Interface}: @tab @code{subroutine acc_copyin(a)} | |
2325 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2326 | @item @emph{Interface}: @tab @code{subroutine acc_copyin(a, len)} | |
2327 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2328 | @item @tab @code{integer len} | |
2329 | @end multitable | |
2330 | ||
2331 | @item @emph{Reference}: | |
2332 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2333 | 3.2.17. | |
2334 | @end table | |
2335 | ||
2336 | ||
2337 | ||
2338 | @node acc_present_or_copyin | |
2339 | @section @code{acc_present_or_copyin} -- If the data is not present on the device, allocate device memory and copy from host memory. | |
2340 | @table @asis | |
2341 | @item @emph{Description} | |
2342 | This function tests if the host data specifed by @var{a} and of length | |
2343 | @var{len} is present or not. If it is not present, then device memory | |
2344 | will be allocated and the host memory copied. The device address of | |
2345 | the newly allocated device memory is returned. | |
2346 | ||
2347 | In Fortran, two (2) forms are supported. In the first form, @var{a} specifies | |
2348 | a contiguous array section. The second form @var{a} specifies a variable or | |
2349 | array element and @var{len} specifies the length in bytes. | |
2350 | ||
2351 | @item @emph{C/C++}: | |
2352 | @multitable @columnfractions .20 .80 | |
2353 | @item @emph{Prototype}: @tab @code{void *acc_present_or_copyin(h_void *a, size_t len);} | |
2354 | @item @emph{Prototype}: @tab @code{void *acc_pcopyin(h_void *a, size_t len);} | |
2355 | @end multitable | |
2356 | ||
2357 | @item @emph{Fortran}: | |
2358 | @multitable @columnfractions .20 .80 | |
2359 | @item @emph{Interface}: @tab @code{subroutine acc_present_or_copyin(a)} | |
2360 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2361 | @item @emph{Interface}: @tab @code{subroutine acc_present_or_copyin(a, len)} | |
2362 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2363 | @item @tab @code{integer len} | |
2364 | @item @emph{Interface}: @tab @code{subroutine acc_pcopyin(a)} | |
2365 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2366 | @item @emph{Interface}: @tab @code{subroutine acc_pcopyin(a, len)} | |
2367 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2368 | @item @tab @code{integer len} | |
2369 | @end multitable | |
2370 | ||
2371 | @item @emph{Reference}: | |
2372 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2373 | 3.2.18. | |
2374 | @end table | |
2375 | ||
2376 | ||
2377 | ||
2378 | @node acc_create | |
2379 | @section @code{acc_create} -- Allocate device memory and map it to host memory. | |
2380 | @table @asis | |
2381 | @item @emph{Description} | |
2382 | This function allocates device memory and maps it to host memory specified | |
2383 | by the host address @var{a} with a length of @var{len} bytes. In C/C++, | |
2384 | the function returns the device address of the allocated device memory. | |
2385 | ||
2386 | In Fortran, two (2) forms are supported. In the first form, @var{a} specifies | |
2387 | a contiguous array section. The second form @var{a} specifies a variable or | |
2388 | array element and @var{len} specifies the length in bytes. | |
2389 | ||
2390 | @item @emph{C/C++}: | |
2391 | @multitable @columnfractions .20 .80 | |
2392 | @item @emph{Prototype}: @tab @code{void *acc_create(h_void *a, size_t len);} | |
2393 | @end multitable | |
2394 | ||
2395 | @item @emph{Fortran}: | |
2396 | @multitable @columnfractions .20 .80 | |
2397 | @item @emph{Interface}: @tab @code{subroutine acc_create(a)} | |
2398 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2399 | @item @emph{Interface}: @tab @code{subroutine acc_create(a, len)} | |
2400 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2401 | @item @tab @code{integer len} | |
2402 | @end multitable | |
2403 | ||
2404 | @item @emph{Reference}: | |
2405 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2406 | 3.2.19. | |
2407 | @end table | |
2408 | ||
2409 | ||
2410 | ||
2411 | @node acc_present_or_create | |
2412 | @section @code{acc_present_or_create} -- If the data is not present on the device, allocate device memory and map it to host memory. | |
2413 | @table @asis | |
2414 | @item @emph{Description} | |
2415 | This function tests if the host data specifed by @var{a} and of length | |
2416 | @var{len} is present or not. If it is not present, then device memory | |
2417 | will be allocated and mapped to host memory. In C/C++, the device address | |
2418 | of the newly allocated device memory is returned. | |
2419 | ||
2420 | In Fortran, two (2) forms are supported. In the first form, @var{a} specifies | |
2421 | a contiguous array section. The second form @var{a} specifies a variable or | |
2422 | array element and @var{len} specifies the length in bytes. | |
2423 | ||
2424 | ||
2425 | @item @emph{C/C++}: | |
2426 | @multitable @columnfractions .20 .80 | |
2427 | @item @emph{Prototype}: @tab @code{void *acc_present_or_create(h_void *a, size_t len)} | |
2428 | @item @emph{Prototype}: @tab @code{void *acc_pcreate(h_void *a, size_t len)} | |
2429 | @end multitable | |
2430 | ||
2431 | @item @emph{Fortran}: | |
2432 | @multitable @columnfractions .20 .80 | |
2433 | @item @emph{Interface}: @tab @code{subroutine acc_present_or_create(a)} | |
2434 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2435 | @item @emph{Interface}: @tab @code{subroutine acc_present_or_create(a, len)} | |
2436 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2437 | @item @tab @code{integer len} | |
2438 | @item @emph{Interface}: @tab @code{subroutine acc_pcreate(a)} | |
2439 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2440 | @item @emph{Interface}: @tab @code{subroutine acc_pcreate(a, len)} | |
2441 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2442 | @item @tab @code{integer len} | |
2443 | @end multitable | |
2444 | ||
2445 | @item @emph{Reference}: | |
2446 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2447 | 3.2.20. | |
2448 | @end table | |
2449 | ||
2450 | ||
2451 | ||
2452 | @node acc_copyout | |
2453 | @section @code{acc_copyout} -- Copy device memory to host memory. | |
2454 | @table @asis | |
2455 | @item @emph{Description} | |
2456 | This function copies mapped device memory to host memory which is specified | |
2457 | by host address @var{a} for a length @var{len} bytes in C/C++. | |
2458 | ||
2459 | In Fortran, two (2) forms are supported. In the first form, @var{a} specifies | |
2460 | a contiguous array section. The second form @var{a} specifies a variable or | |
2461 | array element and @var{len} specifies the length in bytes. | |
2462 | ||
2463 | @item @emph{C/C++}: | |
2464 | @multitable @columnfractions .20 .80 | |
2465 | @item @emph{Prototype}: @tab @code{acc_copyout(h_void *a, size_t len);} | |
2466 | @end multitable | |
2467 | ||
2468 | @item @emph{Fortran}: | |
2469 | @multitable @columnfractions .20 .80 | |
2470 | @item @emph{Interface}: @tab @code{subroutine acc_copyout(a)} | |
2471 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2472 | @item @emph{Interface}: @tab @code{subroutine acc_copyout(a, len)} | |
2473 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2474 | @item @tab @code{integer len} | |
2475 | @end multitable | |
2476 | ||
2477 | @item @emph{Reference}: | |
2478 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2479 | 3.2.21. | |
2480 | @end table | |
2481 | ||
2482 | ||
2483 | ||
2484 | @node acc_delete | |
2485 | @section @code{acc_delete} -- Free device memory. | |
2486 | @table @asis | |
2487 | @item @emph{Description} | |
2488 | This function frees previously allocated device memory specified by | |
2489 | the device address @var{a} and the length of @var{len} bytes. | |
2490 | ||
2491 | In Fortran, two (2) forms are supported. In the first form, @var{a} specifies | |
2492 | a contiguous array section. The second form @var{a} specifies a variable or | |
2493 | array element and @var{len} specifies the length in bytes. | |
2494 | ||
2495 | @item @emph{C/C++}: | |
2496 | @multitable @columnfractions .20 .80 | |
2497 | @item @emph{Prototype}: @tab @code{acc_delete(h_void *a, size_t len);} | |
2498 | @end multitable | |
2499 | ||
2500 | @item @emph{Fortran}: | |
2501 | @multitable @columnfractions .20 .80 | |
2502 | @item @emph{Interface}: @tab @code{subroutine acc_delete(a)} | |
2503 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2504 | @item @emph{Interface}: @tab @code{subroutine acc_delete(a, len)} | |
2505 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2506 | @item @tab @code{integer len} | |
2507 | @end multitable | |
2508 | ||
2509 | @item @emph{Reference}: | |
2510 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2511 | 3.2.22. | |
2512 | @end table | |
2513 | ||
2514 | ||
2515 | ||
2516 | @node acc_update_device | |
2517 | @section @code{acc_update_device} -- Update device memory from mapped host memory. | |
2518 | @table @asis | |
2519 | @item @emph{Description} | |
2520 | This function updates the device copy from the previously mapped host memory. | |
2521 | The host memory is specified with the host address @var{a} and a length of | |
2522 | @var{len} bytes. | |
2523 | ||
2524 | In Fortran, two (2) forms are supported. In the first form, @var{a} specifies | |
2525 | a contiguous array section. The second form @var{a} specifies a variable or | |
2526 | array element and @var{len} specifies the length in bytes. | |
2527 | ||
2528 | @item @emph{C/C++}: | |
2529 | @multitable @columnfractions .20 .80 | |
2530 | @item @emph{Prototype}: @tab @code{acc_update_device(h_void *a, size_t len);} | |
2531 | @end multitable | |
2532 | ||
2533 | @item @emph{Fortran}: | |
2534 | @multitable @columnfractions .20 .80 | |
2535 | @item @emph{Interface}: @tab @code{subroutine acc_update_device(a)} | |
2536 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2537 | @item @emph{Interface}: @tab @code{subroutine acc_update_device(a, len)} | |
2538 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2539 | @item @tab @code{integer len} | |
2540 | @end multitable | |
2541 | ||
2542 | @item @emph{Reference}: | |
2543 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2544 | 3.2.23. | |
2545 | @end table | |
2546 | ||
2547 | ||
2548 | ||
2549 | @node acc_update_self | |
2550 | @section @code{acc_update_self} -- Update host memory from mapped device memory. | |
2551 | @table @asis | |
2552 | @item @emph{Description} | |
2553 | This function updates the host copy from the previously mapped device memory. | |
2554 | The host memory is specified with the host address @var{a} and a length of | |
2555 | @var{len} bytes. | |
2556 | ||
2557 | In Fortran, two (2) forms are supported. In the first form, @var{a} specifies | |
2558 | a contiguous array section. The second form @var{a} specifies a variable or | |
2559 | array element and @var{len} specifies the length in bytes. | |
2560 | ||
2561 | @item @emph{C/C++}: | |
2562 | @multitable @columnfractions .20 .80 | |
2563 | @item @emph{Prototype}: @tab @code{acc_update_self(h_void *a, size_t len);} | |
2564 | @end multitable | |
2565 | ||
2566 | @item @emph{Fortran}: | |
2567 | @multitable @columnfractions .20 .80 | |
2568 | @item @emph{Interface}: @tab @code{subroutine acc_update_self(a)} | |
2569 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2570 | @item @emph{Interface}: @tab @code{subroutine acc_update_self(a, len)} | |
2571 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2572 | @item @tab @code{integer len} | |
2573 | @end multitable | |
2574 | ||
2575 | @item @emph{Reference}: | |
2576 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2577 | 3.2.24. | |
2578 | @end table | |
2579 | ||
2580 | ||
2581 | ||
2582 | @node acc_map_data | |
2583 | @section @code{acc_map_data} -- Map previously allocated device memory to host memory. | |
2584 | @table @asis | |
2585 | @item @emph{Description} | |
2586 | This function maps previously allocated device and host memory. The device | |
2587 | memory is specified with the device address @var{d}. The host memory is | |
2588 | specified with the host address @var{h} and a length of @var{len}. | |
2589 | ||
2590 | @item @emph{C/C++}: | |
2591 | @multitable @columnfractions .20 .80 | |
2592 | @item @emph{Prototype}: @tab @code{acc_map_data(h_void *h, d_void *d, size_t len);} | |
2593 | @end multitable | |
2594 | ||
2595 | @item @emph{Reference}: | |
2596 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2597 | 3.2.25. | |
2598 | @end table | |
2599 | ||
2600 | ||
2601 | ||
2602 | @node acc_unmap_data | |
2603 | @section @code{acc_unmap_data} -- Unmap device memory from host memory. | |
2604 | @table @asis | |
2605 | @item @emph{Description} | |
2606 | This function unmaps previously mapped device and host memory. The latter | |
2607 | specified by @var{h}. | |
2608 | ||
2609 | @item @emph{C/C++}: | |
2610 | @multitable @columnfractions .20 .80 | |
2611 | @item @emph{Prototype}: @tab @code{acc_unmap_data(h_void *h);} | |
2612 | @end multitable | |
2613 | ||
2614 | @item @emph{Reference}: | |
2615 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2616 | 3.2.26. | |
2617 | @end table | |
2618 | ||
2619 | ||
2620 | ||
2621 | @node acc_deviceptr | |
2622 | @section @code{acc_deviceptr} -- Get device pointer associated with specific host address. | |
2623 | @table @asis | |
2624 | @item @emph{Description} | |
2625 | This function returns the device address that has been mapped to the | |
2626 | host address specified by @var{h}. | |
2627 | ||
2628 | @item @emph{C/C++}: | |
2629 | @multitable @columnfractions .20 .80 | |
2630 | @item @emph{Prototype}: @tab @code{void *acc_deviceptr(h_void *h);} | |
2631 | @end multitable | |
2632 | ||
2633 | @item @emph{Reference}: | |
2634 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2635 | 3.2.27. | |
2636 | @end table | |
2637 | ||
2638 | ||
2639 | ||
2640 | @node acc_hostptr | |
2641 | @section @code{acc_hostptr} -- Get host pointer associated with specific device address. | |
2642 | @table @asis | |
2643 | @item @emph{Description} | |
2644 | This function returns the host address that has been mapped to the | |
2645 | device address specified by @var{d}. | |
2646 | ||
2647 | @item @emph{C/C++}: | |
2648 | @multitable @columnfractions .20 .80 | |
2649 | @item @emph{Prototype}: @tab @code{void *acc_hostptr(d_void *d);} | |
2650 | @end multitable | |
2651 | ||
2652 | @item @emph{Reference}: | |
2653 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2654 | 3.2.28. | |
2655 | @end table | |
2656 | ||
2657 | ||
2658 | ||
2659 | @node acc_is_present | |
2660 | @section @code{acc_is_present} -- Indicate whether host variable / array is present on device. | |
2661 | @table @asis | |
2662 | @item @emph{Description} | |
2663 | This function indicates whether the specified host address in @var{a} and a | |
2664 | length of @var{len} bytes is present on the device. In C/C++, a non-zero | |
2665 | value is returned to indicate the presence of the mapped memory on the | |
2666 | device. A zero is returned to indicate the memory is not mapped on the | |
2667 | device. | |
2668 | ||
2669 | In Fortran, two (2) forms are supported. In the first form, @var{a} specifies | |
2670 | a contiguous array section. The second form @var{a} specifies a variable or | |
2671 | array element and @var{len} specifies the length in bytes. If the host | |
2672 | memory is mapped to device memory, then a @code{true} is returned. Otherwise, | |
2673 | a @code{false} is return to indicate the mapped memory is not present. | |
2674 | ||
2675 | @item @emph{C/C++}: | |
2676 | @multitable @columnfractions .20 .80 | |
2677 | @item @emph{Prototype}: @tab @code{int acc_is_present(h_void *a, size_t len);} | |
2678 | @end multitable | |
2679 | ||
2680 | @item @emph{Fortran}: | |
2681 | @multitable @columnfractions .20 .80 | |
2682 | @item @emph{Interface}: @tab @code{function acc_is_present(a)} | |
2683 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2684 | @item @tab @code{logical acc_is_present} | |
2685 | @item @emph{Interface}: @tab @code{function acc_is_present(a, len)} | |
2686 | @item @tab @code{type, dimension(:[,:]...) :: a} | |
2687 | @item @tab @code{integer len} | |
2688 | @item @tab @code{logical acc_is_present} | |
2689 | @end multitable | |
2690 | ||
2691 | @item @emph{Reference}: | |
2692 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2693 | 3.2.29. | |
2694 | @end table | |
2695 | ||
2696 | ||
2697 | ||
2698 | @node acc_memcpy_to_device | |
2699 | @section @code{acc_memcpy_to_device} -- Copy host memory to device memory. | |
2700 | @table @asis | |
2701 | @item @emph{Description} | |
2702 | This function copies host memory specified by host address of @var{src} to | |
2703 | device memory specified by the device address @var{dest} for a length of | |
2704 | @var{bytes} bytes. | |
2705 | ||
2706 | @item @emph{C/C++}: | |
2707 | @multitable @columnfractions .20 .80 | |
2708 | @item @emph{Prototype}: @tab @code{acc_memcpy_to_device(d_void *dest, h_void *src, size_t bytes);} | |
2709 | @end multitable | |
2710 | ||
2711 | @item @emph{Reference}: | |
2712 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2713 | 3.2.30. | |
2714 | @end table | |
2715 | ||
2716 | ||
2717 | ||
2718 | @node acc_memcpy_from_device | |
2719 | @section @code{acc_memcpy_from_device} -- Copy device memory to host memory. | |
2720 | @table @asis | |
2721 | @item @emph{Description} | |
2722 | This function copies host memory specified by host address of @var{src} from | |
2723 | device memory specified by the device address @var{dest} for a length of | |
2724 | @var{bytes} bytes. | |
2725 | ||
2726 | @item @emph{C/C++}: | |
2727 | @multitable @columnfractions .20 .80 | |
2728 | @item @emph{Prototype}: @tab @code{acc_memcpy_from_device(d_void *dest, h_void *src, size_t bytes);} | |
2729 | @end multitable | |
2730 | ||
2731 | @item @emph{Reference}: | |
2732 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2733 | 3.2.31. | |
2734 | @end table | |
2735 | ||
2736 | ||
2737 | ||
2738 | @node acc_get_current_cuda_device | |
2739 | @section @code{acc_get_current_cuda_device} -- Get CUDA device handle. | |
2740 | @table @asis | |
2741 | @item @emph{Description} | |
2742 | This function returns the CUDA device handle. This handle is the same | |
2743 | as used by the CUDA Runtime or Driver API's. | |
2744 | ||
2745 | @item @emph{C/C++}: | |
2746 | @multitable @columnfractions .20 .80 | |
2747 | @item @emph{Prototype}: @tab @code{void *acc_get_current_cuda_device(void);} | |
2748 | @end multitable | |
2749 | ||
2750 | @item @emph{Reference}: | |
2751 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2752 | A.2.1.1. | |
2753 | @end table | |
2754 | ||
2755 | ||
2756 | ||
2757 | @node acc_get_current_cuda_context | |
2758 | @section @code{acc_get_current_cuda_context} -- Get CUDA context handle. | |
2759 | @table @asis | |
2760 | @item @emph{Description} | |
2761 | This function returns the CUDA context handle. This handle is the same | |
2762 | as used by the CUDA Runtime or Driver API's. | |
2763 | ||
2764 | @item @emph{C/C++}: | |
2765 | @multitable @columnfractions .20 .80 | |
2766 | @item @emph{Prototype}: @tab @code{acc_get_current_cuda_context(void);} | |
2767 | @end multitable | |
2768 | ||
2769 | @item @emph{Reference}: | |
2770 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2771 | A.2.1.2. | |
2772 | @end table | |
2773 | ||
2774 | ||
2775 | ||
2776 | @node acc_get_cuda_stream | |
2777 | @section @code{acc_get_cuda_stream} -- Get CUDA stream handle. | |
2778 | @table @asis | |
2779 | @item @emph{Description} | |
2780 | This function returns the CUDA stream handle. This handle is the same | |
2781 | as used by the CUDA Runtime or Driver API's. | |
2782 | ||
2783 | @item @emph{C/C++}: | |
2784 | @multitable @columnfractions .20 .80 | |
2785 | @item @emph{Prototype}: @tab @code{acc_get_cuda_stream(void);} | |
2786 | @end multitable | |
2787 | ||
2788 | @item @emph{Reference}: | |
2789 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2790 | A.2.1.3. | |
2791 | @end table | |
2792 | ||
2793 | ||
2794 | ||
2795 | @node acc_set_cuda_stream | |
2796 | @section @code{acc_set_cuda_stream} -- Set CUDA stream handle. | |
2797 | @table @asis | |
2798 | @item @emph{Description} | |
2799 | This function associates the stream handle specified by @var{stream} with | |
2800 | the asynchronous value specified by @var{async}. | |
2801 | ||
2802 | @item @emph{C/C++}: | |
2803 | @multitable @columnfractions .20 .80 | |
2804 | @item @emph{Prototype}: @tab @code{acc_set_cuda_stream(int async void *stream);} | |
2805 | @end multitable | |
2806 | ||
2807 | @item @emph{Reference}: | |
2808 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2809 | A.2.1.4. | |
2810 | @end table | |
2811 | ||
2812 | ||
2813 | ||
2814 | @c --------------------------------------------------------------------- | |
2815 | @c OpenACC Environment Variables | |
2816 | @c --------------------------------------------------------------------- | |
2817 | ||
2818 | @node OpenACC Environment Variables | |
2819 | @chapter OpenACC Environment Variables | |
2820 | ||
2821 | The variables @env{ACC_DEVICE_TYPE} and @env{ACC_DEVICE_NUM} | |
2822 | are defined by section 4 of the OpenACC specification in version 2.0. | |
2823 | The variable @env{GCC_ACC_NOTIFY} is used for diagnostic purposes. | |
2824 | ||
2825 | @menu | |
2826 | * ACC_DEVICE_TYPE:: | |
2827 | * ACC_DEVICE_NUM:: | |
2828 | * GCC_ACC_NOTIFY:: | |
2829 | @end menu | |
2830 | ||
2831 | ||
2832 | ||
2833 | @node ACC_DEVICE_TYPE | |
2834 | @section @code{ACC_DEVICE_TYPE} | |
2835 | @table @asis | |
2836 | @item @emph{Reference}: | |
2837 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2838 | 4.1. | |
2839 | @end table | |
2840 | ||
2841 | ||
2842 | ||
2843 | @node ACC_DEVICE_NUM | |
2844 | @section @code{ACC_DEVICE_NUM} | |
2845 | @table @asis | |
2846 | @item @emph{Reference}: | |
2847 | @uref{http://www.openacc.org/, OpenACC specification v2.0}, section | |
2848 | 4.2. | |
2849 | @end table | |
2850 | ||
2851 | ||
2852 | ||
2853 | @node GCC_ACC_NOTIFY | |
2854 | @section @code{GCC_ACC_NOTIFY} | |
2855 | @table @asis | |
2856 | @item @emph{Description}: | |
2857 | Print debug information pertaining to the accelerator. | |
2858 | @end table | |
2859 | ||
2860 | ||
2861 | ||
2862 | @c --------------------------------------------------------------------- | |
2863 | @c CUDA Streams Usage | |
2864 | @c --------------------------------------------------------------------- | |
2865 | ||
2866 | @node CUDA Streams Usage | |
2867 | @chapter CUDA Streams Usage | |
2868 | ||
2869 | This applies to the @code{nvptx} plugin only. | |
2870 | ||
2871 | The library provides elements that perform asynchronous movement of | |
2872 | data and asynchronous operation of computing constructs. This | |
2873 | asynchronous functionality is implemented by making use of CUDA | |
2874 | streams@footnote{See "Stream Management" in "CUDA Driver API", | |
2875 | TRM-06703-001, Version 5.5, for additional information}. | |
2876 | ||
2877 | The primary means by that the asychronous functionality is accessed | |
2878 | is through the use of those OpenACC directives which make use of the | |
2879 | @code{async} and @code{wait} clauses. When the @code{async} clause is | |
2880 | first used with a directive, it creates a CUDA stream. If an | |
2881 | @code{async-argument} is used with the @code{async} clause, then the | |
2882 | stream is associated with the specified @code{async-argument}. | |
2883 | ||
2884 | Following the creation of an association between a CUDA stream and the | |
2885 | @code{async-argument} of an @code{async} clause, both the @code{wait} | |
2886 | clause and the @code{wait} directive can be used. When either the | |
2887 | clause or directive is used after stream creation, it creates a | |
2888 | rendezvous point whereby execution waits until all operations | |
2889 | associated with the @code{async-argument}, that is, stream, have | |
2890 | completed. | |
2891 | ||
2892 | Normally, the management of the streams that are created as a result of | |
2893 | using the @code{async} clause, is done without any intervention by the | |
2894 | caller. This implies the association between the @code{async-argument} | |
2895 | and the CUDA stream will be maintained for the lifetime of the program. | |
2896 | However, this association can be changed through the use of the library | |
2897 | function @code{acc_set_cuda_stream}. When the function | |
2898 | @code{acc_set_cuda_stream} is called, the CUDA stream that was | |
2899 | originally associated with the @code{async} clause will be destroyed. | |
2900 | Caution should be taken when changing the association as subsequent | |
2901 | references to the @code{async-argument} refer to a different | |
2902 | CUDA stream. | |
2903 | ||
2904 | ||
2905 | ||
2906 | @c --------------------------------------------------------------------- | |
2907 | @c OpenACC Library Interoperability | |
2908 | @c --------------------------------------------------------------------- | |
2909 | ||
2910 | @node OpenACC Library Interoperability | |
2911 | @chapter OpenACC Library Interoperability | |
2912 | ||
2913 | @section Introduction | |
2914 | ||
2915 | The OpenACC library uses the CUDA Driver API, and may interact with | |
2916 | programs that use the Runtime library directly, or another library | |
2917 | based on the Runtime library, e.g., CUBLAS@footnote{See section 2.26, | |
2918 | "Interactions with the CUDA Driver API" in | |
2919 | "CUDA Runtime API", Version 5.5, and section 2.27, "VDPAU | |
2920 | Interoperability", in "CUDA Driver API", TRM-06703-001, Version 5.5, | |
2921 | for additional information on library interoperability.}. | |
2922 | This chapter describes the use cases and what changes are | |
2923 | required in order to use both the OpenACC library and the CUBLAS and Runtime | |
2924 | libraries within a program. | |
2925 | ||
2926 | @section First invocation: NVIDIA CUBLAS library API | |
2927 | ||
2928 | In this first use case (see below), a function in the CUBLAS library is called | |
2929 | prior to any of the functions in the OpenACC library. More specifically, the | |
2930 | function @code{cublasCreate()}. | |
2931 | ||
2932 | When invoked, the function initializes the library and allocates the | |
2933 | hardware resources on the host and the device on behalf of the caller. Once | |
2934 | the initialization and allocation has completed, a handle is returned to the | |
2935 | caller. The OpenACC library also requires initialization and allocation of | |
2936 | hardware resources. Since the CUBLAS library has already allocated the | |
2937 | hardware resources for the device, all that is left to do is to initialize | |
2938 | the OpenACC library and acquire the hardware resources on the host. | |
2939 | ||
2940 | Prior to calling the OpenACC function that initializes the library and | |
2941 | allocate the host hardware resources, you need to acquire the device number | |
2942 | that was allocated during the call to @code{cublasCreate()}. The invoking of the | |
2943 | runtime library function @code{cudaGetDevice()} accomplishes this. Once | |
2944 | acquired, the device number is passed along with the device type as | |
2945 | parameters to the OpenACC library function @code{acc_set_device_num()}. | |
2946 | ||
2947 | Once the call to @code{acc_set_device_num()} has completed, the OpenACC | |
2948 | library uses the context that was created during the call to | |
2949 | @code{cublasCreate()}. In other words, both libraries will be sharing the | |
2950 | same context. | |
2951 | ||
2952 | @smallexample | |
2953 | /* Create the handle */ | |
2954 | s = cublasCreate(&h); | |
2955 | if (s != CUBLAS_STATUS_SUCCESS) | |
2956 | @{ | |
2957 | fprintf(stderr, "cublasCreate failed %d\n", s); | |
2958 | exit(EXIT_FAILURE); | |
2959 | @} | |
2960 | ||
2961 | /* Get the device number */ | |
2962 | e = cudaGetDevice(&dev); | |
2963 | if (e != cudaSuccess) | |
2964 | @{ | |
2965 | fprintf(stderr, "cudaGetDevice failed %d\n", e); | |
2966 | exit(EXIT_FAILURE); | |
2967 | @} | |
2968 | ||
2969 | /* Initialize OpenACC library and use device 'dev' */ | |
2970 | acc_set_device_num(dev, acc_device_nvidia); | |
2971 | ||
2972 | @end smallexample | |
2973 | @center Use Case 1 | |
2974 | ||
2975 | @section First invocation: OpenACC library API | |
2976 | ||
2977 | In this second use case (see below), a function in the OpenACC library is | |
2978 | called prior to any of the functions in the CUBLAS library. More specificially, | |
2979 | the function @code{acc_set_device_num()}. | |
2980 | ||
2981 | In the use case presented here, the function @code{acc_set_device_num()} | |
2982 | is used to both initialize the OpenACC library and allocate the hardware | |
2983 | resources on the host and the device. In the call to the function, the | |
2984 | call parameters specify which device to use and what device | |
2985 | type to use, i.e., @code{acc_device_nvidia}. It should be noted that this | |
2986 | is but one method to initialize the OpenACC library and allocate the | |
2987 | appropriate hardware resources. Other methods are available through the | |
2988 | use of environment variables and these will be discussed in the next section. | |
2989 | ||
2990 | Once the call to @code{acc_set_device_num()} has completed, other OpenACC | |
2991 | functions can be called as seen with multiple calls being made to | |
2992 | @code{acc_copyin()}. In addition, calls can be made to functions in the | |
2993 | CUBLAS library. In the use case a call to @code{cublasCreate()} is made | |
2994 | subsequent to the calls to @code{acc_copyin()}. | |
2995 | As seen in the previous use case, a call to @code{cublasCreate()} | |
2996 | initializes the CUBLAS library and allocates the hardware resources on the | |
2997 | host and the device. However, since the device has already been allocated, | |
2998 | @code{cublasCreate()} will only initialize the CUBLAS library and allocate | |
2999 | the appropriate hardware resources on the host. The context that was created | |
3000 | as part of the OpenACC initialization is shared with the CUBLAS library, | |
3001 | similarly to the first use case. | |
3002 | ||
3003 | @smallexample | |
3004 | dev = 0; | |
3005 | ||
3006 | acc_set_device_num(dev, acc_device_nvidia); | |
3007 | ||
3008 | /* Copy the first set to the device */ | |
3009 | d_X = acc_copyin(&h_X[0], N * sizeof (float)); | |
3010 | if (d_X == NULL) | |
3011 | @{ | |
3012 | fprintf(stderr, "copyin error h_X\n"); | |
3013 | exit(EXIT_FAILURE); | |
3014 | @} | |
3015 | ||
3016 | /* Copy the second set to the device */ | |
3017 | d_Y = acc_copyin(&h_Y1[0], N * sizeof (float)); | |
3018 | if (d_Y == NULL) | |
3019 | @{ | |
3020 | fprintf(stderr, "copyin error h_Y1\n"); | |
3021 | exit(EXIT_FAILURE); | |
3022 | @} | |
3023 | ||
3024 | /* Create the handle */ | |
3025 | s = cublasCreate(&h); | |
3026 | if (s != CUBLAS_STATUS_SUCCESS) | |
3027 | @{ | |
3028 | fprintf(stderr, "cublasCreate failed %d\n", s); | |
3029 | exit(EXIT_FAILURE); | |
3030 | @} | |
3031 | ||
3032 | /* Perform saxpy using CUBLAS library function */ | |
3033 | s = cublasSaxpy(h, N, &alpha, d_X, 1, d_Y, 1); | |
3034 | if (s != CUBLAS_STATUS_SUCCESS) | |
3035 | @{ | |
3036 | fprintf(stderr, "cublasSaxpy failed %d\n", s); | |
3037 | exit(EXIT_FAILURE); | |
3038 | @} | |
3039 | ||
3040 | /* Copy the results from the device */ | |
3041 | acc_memcpy_from_device(&h_Y1[0], d_Y, N * sizeof (float)); | |
3042 | ||
3043 | @end smallexample | |
3044 | @center Use Case 2 | |
3045 | ||
3046 | @section OpenACC library and environment variables | |
3047 | ||
3048 | There are two environment variables associated with the OpenACC library | |
3049 | that may be used to control the device type and device number: | |
3050 | @env{ACC_DEVICE_TYPE} and @env{ACC_DEVICE_NUM}, respecively. These two | |
3051 | environement variables can be used as an alternative to calling | |
3052 | @code{acc_set_device_num()}. As seen in the second use case, the device | |
3053 | type and device number were specified using @code{acc_set_device_num()}. | |
3054 | If however, the aforementioned environment variables were set, then the | |
3055 | call to @code{acc_set_device_num()} would not be required. | |
3056 | ||
3057 | ||
3058 | The use of the environment variables is only relevant when an OpenACC function | |
3059 | is called prior to a call to @code{cudaCreate()}. If @code{cudaCreate()} | |
3060 | is called prior to a call to an OpenACC function, then you must call | |
3061 | @code{acc_set_device_num()}@footnote{More complete information | |
3062 | about @env{ACC_DEVICE_TYPE} and @env{ACC_DEVICE_NUM} can be found in | |
3063 | sections 4.1 and 4.2 of the @uref{http://www.openacc.org/, OpenACC} | |
3064 | Application Programming Interface”, Version 2.0.} | |
3065 | ||
3066 | ||
3067 | ||
3721b9e1 DF |
3068 | @c --------------------------------------------------------------------- |
3069 | @c The libgomp ABI | |
3070 | @c --------------------------------------------------------------------- | |
3071 | ||
3072 | @node The libgomp ABI | |
3073 | @chapter The libgomp ABI | |
3074 | ||
3075 | The following sections present notes on the external ABI as | |
6a2ba183 | 3076 | presented by libgomp. Only maintainers should need them. |
3721b9e1 DF |
3077 | |
3078 | @menu | |
3079 | * Implementing MASTER construct:: | |
3080 | * Implementing CRITICAL construct:: | |
3081 | * Implementing ATOMIC construct:: | |
3082 | * Implementing FLUSH construct:: | |
3083 | * Implementing BARRIER construct:: | |
3084 | * Implementing THREADPRIVATE construct:: | |
3085 | * Implementing PRIVATE clause:: | |
3086 | * Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses:: | |
3087 | * Implementing REDUCTION clause:: | |
3088 | * Implementing PARALLEL construct:: | |
3089 | * Implementing FOR construct:: | |
3090 | * Implementing ORDERED construct:: | |
3091 | * Implementing SECTIONS construct:: | |
3092 | * Implementing SINGLE construct:: | |
cdf6119d | 3093 | * Implementing OpenACC's PARALLEL construct:: |
3721b9e1 DF |
3094 | @end menu |
3095 | ||
3096 | ||
3097 | @node Implementing MASTER construct | |
3098 | @section Implementing MASTER construct | |
3099 | ||
3100 | @smallexample | |
3101 | if (omp_get_thread_num () == 0) | |
3102 | block | |
3103 | @end smallexample | |
3104 | ||
3105 | Alternately, we generate two copies of the parallel subfunction | |
3106 | and only include this in the version run by the master thread. | |
6a2ba183 | 3107 | Surely this is not worthwhile though... |
3721b9e1 DF |
3108 | |
3109 | ||
3110 | ||
3111 | @node Implementing CRITICAL construct | |
3112 | @section Implementing CRITICAL construct | |
3113 | ||
3114 | Without a specified name, | |
3115 | ||
3116 | @smallexample | |
3117 | void GOMP_critical_start (void); | |
3118 | void GOMP_critical_end (void); | |
3119 | @end smallexample | |
3120 | ||
3121 | so that we don't get COPY relocations from libgomp to the main | |
3122 | application. | |
3123 | ||
3124 | With a specified name, use omp_set_lock and omp_unset_lock with | |
3125 | name being transformed into a variable declared like | |
3126 | ||
3127 | @smallexample | |
3128 | omp_lock_t gomp_critical_user_<name> __attribute__((common)) | |
3129 | @end smallexample | |
3130 | ||
3131 | Ideally the ABI would specify that all zero is a valid unlocked | |
6a2ba183 | 3132 | state, and so we wouldn't need to initialize this at |
3721b9e1 DF |
3133 | startup. |
3134 | ||
3135 | ||
3136 | ||
3137 | @node Implementing ATOMIC construct | |
3138 | @section Implementing ATOMIC construct | |
3139 | ||
3140 | The target should implement the @code{__sync} builtins. | |
3141 | ||
3142 | Failing that we could add | |
3143 | ||
3144 | @smallexample | |
3145 | void GOMP_atomic_enter (void) | |
3146 | void GOMP_atomic_exit (void) | |
3147 | @end smallexample | |
3148 | ||
3149 | which reuses the regular lock code, but with yet another lock | |
3150 | object private to the library. | |
3151 | ||
3152 | ||
3153 | ||
3154 | @node Implementing FLUSH construct | |
3155 | @section Implementing FLUSH construct | |
3156 | ||
3157 | Expands to the @code{__sync_synchronize} builtin. | |
3158 | ||
3159 | ||
3160 | ||
3161 | @node Implementing BARRIER construct | |
3162 | @section Implementing BARRIER construct | |
3163 | ||
3164 | @smallexample | |
3165 | void GOMP_barrier (void) | |
3166 | @end smallexample | |
3167 | ||
3168 | ||
3169 | @node Implementing THREADPRIVATE construct | |
3170 | @section Implementing THREADPRIVATE construct | |
3171 | ||
3172 | In _most_ cases we can map this directly to @code{__thread}. Except | |
3173 | that OMP allows constructors for C++ objects. We can either | |
3174 | refuse to support this (how often is it used?) or we can | |
3175 | implement something akin to .ctors. | |
3176 | ||
3177 | Even more ideally, this ctor feature is handled by extensions | |
3178 | to the main pthreads library. Failing that, we can have a set | |
3179 | of entry points to register ctor functions to be called. | |
3180 | ||
3181 | ||
3182 | ||
3183 | @node Implementing PRIVATE clause | |
3184 | @section Implementing PRIVATE clause | |
3185 | ||
3186 | In association with a PARALLEL, or within the lexical extent | |
3187 | of a PARALLEL block, the variable becomes a local variable in | |
3188 | the parallel subfunction. | |
3189 | ||
3190 | In association with FOR or SECTIONS blocks, create a new | |
3191 | automatic variable within the current function. This preserves | |
3192 | the semantic of new variable creation. | |
3193 | ||
3194 | ||
3195 | ||
3196 | @node Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses | |
3197 | @section Implementing FIRSTPRIVATE LASTPRIVATE COPYIN and COPYPRIVATE clauses | |
3198 | ||
6a2ba183 AH |
3199 | This seems simple enough for PARALLEL blocks. Create a private |
3200 | struct for communicating between the parent and subfunction. | |
3721b9e1 DF |
3201 | In the parent, copy in values for scalar and "small" structs; |
3202 | copy in addresses for others TREE_ADDRESSABLE types. In the | |
3203 | subfunction, copy the value into the local variable. | |
3204 | ||
6a2ba183 AH |
3205 | It is not clear what to do with bare FOR or SECTION blocks. |
3206 | The only thing I can figure is that we do something like: | |
3721b9e1 DF |
3207 | |
3208 | @smallexample | |
3209 | #pragma omp for firstprivate(x) lastprivate(y) | |
3210 | for (int i = 0; i < n; ++i) | |
3211 | body; | |
3212 | @end smallexample | |
3213 | ||
3214 | which becomes | |
3215 | ||
3216 | @smallexample | |
3217 | @{ | |
3218 | int x = x, y; | |
3219 | ||
3220 | // for stuff | |
3221 | ||
3222 | if (i == n) | |
3223 | y = y; | |
3224 | @} | |
3225 | @end smallexample | |
3226 | ||
3227 | where the "x=x" and "y=y" assignments actually have different | |
3228 | uids for the two variables, i.e. not something you could write | |
3229 | directly in C. Presumably this only makes sense if the "outer" | |
3230 | x and y are global variables. | |
3231 | ||
3232 | COPYPRIVATE would work the same way, except the structure | |
3233 | broadcast would have to happen via SINGLE machinery instead. | |
3234 | ||
3235 | ||
3236 | ||
3237 | @node Implementing REDUCTION clause | |
3238 | @section Implementing REDUCTION clause | |
3239 | ||
3240 | The private struct mentioned in the previous section should have | |
3241 | a pointer to an array of the type of the variable, indexed by the | |
3242 | thread's @var{team_id}. The thread stores its final value into the | |
6a2ba183 | 3243 | array, and after the barrier, the master thread iterates over the |
3721b9e1 DF |
3244 | array to collect the values. |
3245 | ||
3246 | ||
3247 | @node Implementing PARALLEL construct | |
3248 | @section Implementing PARALLEL construct | |
3249 | ||
3250 | @smallexample | |
3251 | #pragma omp parallel | |
3252 | @{ | |
3253 | body; | |
3254 | @} | |
3255 | @end smallexample | |
3256 | ||
3257 | becomes | |
3258 | ||
3259 | @smallexample | |
3260 | void subfunction (void *data) | |
3261 | @{ | |
3262 | use data; | |
3263 | body; | |
3264 | @} | |
3265 | ||
3266 | setup data; | |
3267 | GOMP_parallel_start (subfunction, &data, num_threads); | |
3268 | subfunction (&data); | |
3269 | GOMP_parallel_end (); | |
3270 | @end smallexample | |
3271 | ||
3272 | @smallexample | |
3273 | void GOMP_parallel_start (void (*fn)(void *), void *data, unsigned num_threads) | |
3274 | @end smallexample | |
3275 | ||
3276 | The @var{FN} argument is the subfunction to be run in parallel. | |
3277 | ||
3278 | The @var{DATA} argument is a pointer to a structure used to | |
3279 | communicate data in and out of the subfunction, as discussed | |
f1b0882e | 3280 | above with respect to FIRSTPRIVATE et al. |
3721b9e1 DF |
3281 | |
3282 | The @var{NUM_THREADS} argument is 1 if an IF clause is present | |
3283 | and false, or the value of the NUM_THREADS clause, if | |
3284 | present, or 0. | |
3285 | ||
3286 | The function needs to create the appropriate number of | |
3287 | threads and/or launch them from the dock. It needs to | |
3288 | create the team structure and assign team ids. | |
3289 | ||
3290 | @smallexample | |
3291 | void GOMP_parallel_end (void) | |
3292 | @end smallexample | |
3293 | ||
3294 | Tears down the team and returns us to the previous @code{omp_in_parallel()} state. | |
3295 | ||
3296 | ||
3297 | ||
3298 | @node Implementing FOR construct | |
3299 | @section Implementing FOR construct | |
3300 | ||
3301 | @smallexample | |
3302 | #pragma omp parallel for | |
3303 | for (i = lb; i <= ub; i++) | |
3304 | body; | |
3305 | @end smallexample | |
3306 | ||
3307 | becomes | |
3308 | ||
3309 | @smallexample | |
3310 | void subfunction (void *data) | |
3311 | @{ | |
3312 | long _s0, _e0; | |
3313 | while (GOMP_loop_static_next (&_s0, &_e0)) | |
3314 | @{ | |
3315 | long _e1 = _e0, i; | |
3316 | for (i = _s0; i < _e1; i++) | |
3317 | body; | |
3318 | @} | |
3319 | GOMP_loop_end_nowait (); | |
3320 | @} | |
3321 | ||
3322 | GOMP_parallel_loop_static (subfunction, NULL, 0, lb, ub+1, 1, 0); | |
3323 | subfunction (NULL); | |
3324 | GOMP_parallel_end (); | |
3325 | @end smallexample | |
3326 | ||
3327 | @smallexample | |
3328 | #pragma omp for schedule(runtime) | |
3329 | for (i = 0; i < n; i++) | |
3330 | body; | |
3331 | @end smallexample | |
3332 | ||
3333 | becomes | |
3334 | ||
3335 | @smallexample | |
3336 | @{ | |
3337 | long i, _s0, _e0; | |
3338 | if (GOMP_loop_runtime_start (0, n, 1, &_s0, &_e0)) | |
3339 | do @{ | |
3340 | long _e1 = _e0; | |
3341 | for (i = _s0, i < _e0; i++) | |
3342 | body; | |
3343 | @} while (GOMP_loop_runtime_next (&_s0, _&e0)); | |
3344 | GOMP_loop_end (); | |
3345 | @} | |
3346 | @end smallexample | |
3347 | ||
6a2ba183 | 3348 | Note that while it looks like there is trickiness to propagating |
3721b9e1 DF |
3349 | a non-constant STEP, there isn't really. We're explicitly allowed |
3350 | to evaluate it as many times as we want, and any variables involved | |
3351 | should automatically be handled as PRIVATE or SHARED like any other | |
3352 | variables. So the expression should remain evaluable in the | |
3353 | subfunction. We can also pull it into a local variable if we like, | |
3354 | but since its supposed to remain unchanged, we can also not if we like. | |
3355 | ||
3356 | If we have SCHEDULE(STATIC), and no ORDERED, then we ought to be | |
3357 | able to get away with no work-sharing context at all, since we can | |
3358 | simply perform the arithmetic directly in each thread to divide up | |
3359 | the iterations. Which would mean that we wouldn't need to call any | |
3360 | of these routines. | |
3361 | ||
3362 | There are separate routines for handling loops with an ORDERED | |
3363 | clause. Bookkeeping for that is non-trivial... | |
3364 | ||
3365 | ||
3366 | ||
3367 | @node Implementing ORDERED construct | |
3368 | @section Implementing ORDERED construct | |
3369 | ||
3370 | @smallexample | |
3371 | void GOMP_ordered_start (void) | |
3372 | void GOMP_ordered_end (void) | |
3373 | @end smallexample | |
3374 | ||
3375 | ||
3376 | ||
3377 | @node Implementing SECTIONS construct | |
3378 | @section Implementing SECTIONS construct | |
3379 | ||
3380 | A block as | |
3381 | ||
3382 | @smallexample | |
3383 | #pragma omp sections | |
3384 | @{ | |
3385 | #pragma omp section | |
3386 | stmt1; | |
3387 | #pragma omp section | |
3388 | stmt2; | |
3389 | #pragma omp section | |
3390 | stmt3; | |
3391 | @} | |
3392 | @end smallexample | |
3393 | ||
3394 | becomes | |
3395 | ||
3396 | @smallexample | |
3397 | for (i = GOMP_sections_start (3); i != 0; i = GOMP_sections_next ()) | |
3398 | switch (i) | |
3399 | @{ | |
3400 | case 1: | |
3401 | stmt1; | |
3402 | break; | |
3403 | case 2: | |
3404 | stmt2; | |
3405 | break; | |
3406 | case 3: | |
3407 | stmt3; | |
3408 | break; | |
3409 | @} | |
3410 | GOMP_barrier (); | |
3411 | @end smallexample | |
3412 | ||
3413 | ||
3414 | @node Implementing SINGLE construct | |
3415 | @section Implementing SINGLE construct | |
3416 | ||
3417 | A block like | |
3418 | ||
3419 | @smallexample | |
3420 | #pragma omp single | |
3421 | @{ | |
3422 | body; | |
3423 | @} | |
3424 | @end smallexample | |
3425 | ||
3426 | becomes | |
3427 | ||
3428 | @smallexample | |
3429 | if (GOMP_single_start ()) | |
3430 | body; | |
3431 | GOMP_barrier (); | |
3432 | @end smallexample | |
3433 | ||
3434 | while | |
3435 | ||
3436 | @smallexample | |
3437 | #pragma omp single copyprivate(x) | |
3438 | body; | |
3439 | @end smallexample | |
3440 | ||
3441 | becomes | |
3442 | ||
3443 | @smallexample | |
3444 | datap = GOMP_single_copy_start (); | |
3445 | if (datap == NULL) | |
3446 | @{ | |
3447 | body; | |
3448 | data.x = x; | |
3449 | GOMP_single_copy_end (&data); | |
3450 | @} | |
3451 | else | |
3452 | x = datap->x; | |
3453 | GOMP_barrier (); | |
3454 | @end smallexample | |
3455 | ||
3456 | ||
3457 | ||
cdf6119d JN |
3458 | @node Implementing OpenACC's PARALLEL construct |
3459 | @section Implementing OpenACC's PARALLEL construct | |
3460 | ||
3461 | @smallexample | |
3462 | void GOACC_parallel () | |
3463 | @end smallexample | |
3464 | ||
3465 | ||
3466 | ||
3721b9e1 | 3467 | @c --------------------------------------------------------------------- |
f1f3453e | 3468 | @c Reporting Bugs |
3721b9e1 DF |
3469 | @c --------------------------------------------------------------------- |
3470 | ||
3471 | @node Reporting Bugs | |
3472 | @chapter Reporting Bugs | |
3473 | ||
f1f3453e TS |
3474 | Bugs in the GNU Offloading and Multi Processing Runtime Library should |
3475 | be reported via @uref{http://gcc.gnu.org/bugzilla/, Bugzilla}. Please add | |
41dbbb37 TS |
3476 | "openacc", or "openmp", or both to the keywords field in the bug |
3477 | report, as appropriate. | |
3721b9e1 DF |
3478 | |
3479 | ||
3480 | ||
3481 | @c --------------------------------------------------------------------- | |
3482 | @c GNU General Public License | |
3483 | @c --------------------------------------------------------------------- | |
3484 | ||
e6fdc918 | 3485 | @include gpl_v3.texi |
3721b9e1 DF |
3486 | |
3487 | ||
3488 | ||
3489 | @c --------------------------------------------------------------------- | |
3490 | @c GNU Free Documentation License | |
3491 | @c --------------------------------------------------------------------- | |
3492 | ||
3493 | @include fdl.texi | |
3494 | ||
3495 | ||
3496 | ||
3497 | @c --------------------------------------------------------------------- | |
3498 | @c Funding Free Software | |
3499 | @c --------------------------------------------------------------------- | |
3500 | ||
3501 | @include funding.texi | |
3502 | ||
3503 | @c --------------------------------------------------------------------- | |
3504 | @c Index | |
3505 | @c --------------------------------------------------------------------- | |
3506 | ||
3d3949df SL |
3507 | @node Library Index |
3508 | @unnumbered Library Index | |
3721b9e1 DF |
3509 | |
3510 | @printindex cp | |
3511 | ||
3512 | @bye |