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a0884cf0 | 1 | /* Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc. |
953ff289 DN |
2 | Contributed by Richard Henderson <rth@redhat.com>. |
3 | ||
4 | This file is part of the GNU OpenMP Library (libgomp). | |
5 | ||
6 | Libgomp is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
13 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for | |
14 | more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with libgomp; see the file COPYING.LIB. If not, write to the | |
18 | Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
21 | /* As a special exception, if you link this library with other files, some | |
22 | of which are compiled with GCC, to produce an executable, this library | |
23 | does not by itself cause the resulting executable to be covered by the | |
24 | GNU General Public License. This exception does not however invalidate | |
25 | any other reasons why the executable file might be covered by the GNU | |
26 | General Public License. */ | |
27 | ||
28 | /* This file defines the OpenMP internal control variables, and arranges | |
29 | for them to be initialized from environment variables at startup. */ | |
30 | ||
31 | #include "libgomp.h" | |
32 | #include "libgomp_f.h" | |
89b3e3cd | 33 | #include <ctype.h> |
953ff289 DN |
34 | #include <stdlib.h> |
35 | #include <string.h> | |
d0d1b24d RH |
36 | #include <limits.h> |
37 | #include <errno.h> | |
953ff289 DN |
38 | |
39 | ||
d0d1b24d | 40 | unsigned long gomp_nthreads_var = 1; |
953ff289 DN |
41 | bool gomp_dyn_var = false; |
42 | bool gomp_nest_var = false; | |
43 | enum gomp_schedule_type gomp_run_sched_var = GFS_DYNAMIC; | |
d0d1b24d | 44 | unsigned long gomp_run_sched_chunk = 1; |
a0884cf0 JJ |
45 | unsigned short *gomp_cpu_affinity; |
46 | size_t gomp_cpu_affinity_len; | |
953ff289 DN |
47 | |
48 | /* Parse the OMP_SCHEDULE environment variable. */ | |
49 | ||
50 | static void | |
51 | parse_schedule (void) | |
52 | { | |
53 | char *env, *end; | |
6acf0b38 | 54 | unsigned long value; |
953ff289 DN |
55 | |
56 | env = getenv ("OMP_SCHEDULE"); | |
57 | if (env == NULL) | |
58 | return; | |
59 | ||
89b3e3cd JJ |
60 | while (isspace ((unsigned char) *env)) |
61 | ++env; | |
62 | if (strncasecmp (env, "static", 6) == 0) | |
953ff289 DN |
63 | { |
64 | gomp_run_sched_var = GFS_STATIC; | |
65 | env += 6; | |
66 | } | |
89b3e3cd | 67 | else if (strncasecmp (env, "dynamic", 7) == 0) |
953ff289 DN |
68 | { |
69 | gomp_run_sched_var = GFS_DYNAMIC; | |
70 | env += 7; | |
71 | } | |
89b3e3cd | 72 | else if (strncasecmp (env, "guided", 6) == 0) |
953ff289 DN |
73 | { |
74 | gomp_run_sched_var = GFS_GUIDED; | |
75 | env += 6; | |
76 | } | |
77 | else | |
78 | goto unknown; | |
79 | ||
89b3e3cd JJ |
80 | while (isspace ((unsigned char) *env)) |
81 | ++env; | |
953ff289 DN |
82 | if (*env == '\0') |
83 | return; | |
89b3e3cd | 84 | if (*env++ != ',') |
953ff289 | 85 | goto unknown; |
89b3e3cd JJ |
86 | while (isspace ((unsigned char) *env)) |
87 | ++env; | |
953ff289 | 88 | if (*env == '\0') |
953ff289 DN |
89 | goto invalid; |
90 | ||
6acf0b38 UB |
91 | errno = 0; |
92 | value = strtoul (env, &end, 10); | |
93 | if (errno) | |
94 | goto invalid; | |
95 | ||
89b3e3cd JJ |
96 | while (isspace ((unsigned char) *end)) |
97 | ++end; | |
953ff289 DN |
98 | if (*end != '\0') |
99 | goto invalid; | |
6acf0b38 UB |
100 | |
101 | gomp_run_sched_chunk = value; | |
953ff289 DN |
102 | return; |
103 | ||
104 | unknown: | |
105 | gomp_error ("Unknown value for environment variable OMP_SCHEDULE"); | |
106 | return; | |
107 | ||
108 | invalid: | |
109 | gomp_error ("Invalid value for chunk size in " | |
110 | "environment variable OMP_SCHEDULE"); | |
953ff289 DN |
111 | return; |
112 | } | |
113 | ||
d0d1b24d | 114 | /* Parse an unsigned long environment varible. Return true if one was |
953ff289 DN |
115 | present and it was successfully parsed. */ |
116 | ||
117 | static bool | |
d0d1b24d | 118 | parse_unsigned_long (const char *name, unsigned long *pvalue) |
953ff289 DN |
119 | { |
120 | char *env, *end; | |
d0d1b24d | 121 | unsigned long value; |
953ff289 | 122 | |
d0d1b24d | 123 | env = getenv (name); |
953ff289 DN |
124 | if (env == NULL) |
125 | return false; | |
126 | ||
89b3e3cd JJ |
127 | while (isspace ((unsigned char) *env)) |
128 | ++env; | |
953ff289 DN |
129 | if (*env == '\0') |
130 | goto invalid; | |
131 | ||
6acf0b38 | 132 | errno = 0; |
d0d1b24d | 133 | value = strtoul (env, &end, 10); |
6acf0b38 UB |
134 | if (errno || (long) value <= 0) |
135 | goto invalid; | |
136 | ||
89b3e3cd JJ |
137 | while (isspace ((unsigned char) *end)) |
138 | ++end; | |
953ff289 DN |
139 | if (*end != '\0') |
140 | goto invalid; | |
d0d1b24d RH |
141 | |
142 | *pvalue = value; | |
953ff289 DN |
143 | return true; |
144 | ||
145 | invalid: | |
d0d1b24d | 146 | gomp_error ("Invalid value for environment variable %s", name); |
953ff289 DN |
147 | return false; |
148 | } | |
149 | ||
d0d1b24d | 150 | /* Parse a boolean value for environment variable NAME and store the |
953ff289 DN |
151 | result in VALUE. */ |
152 | ||
153 | static void | |
154 | parse_boolean (const char *name, bool *value) | |
155 | { | |
156 | const char *env; | |
157 | ||
158 | env = getenv (name); | |
159 | if (env == NULL) | |
160 | return; | |
161 | ||
89b3e3cd JJ |
162 | while (isspace ((unsigned char) *env)) |
163 | ++env; | |
164 | if (strncasecmp (env, "true", 4) == 0) | |
165 | { | |
166 | *value = true; | |
167 | env += 4; | |
168 | } | |
169 | else if (strncasecmp (env, "false", 5) == 0) | |
170 | { | |
171 | *value = false; | |
172 | env += 5; | |
173 | } | |
953ff289 | 174 | else |
89b3e3cd JJ |
175 | env = "X"; |
176 | while (isspace ((unsigned char) *env)) | |
177 | ++env; | |
178 | if (*env != '\0') | |
d0d1b24d | 179 | gomp_error ("Invalid value for environment variable %s", name); |
953ff289 DN |
180 | } |
181 | ||
a0884cf0 JJ |
182 | /* Parse the GOMP_CPU_AFFINITY environment varible. Return true if one was |
183 | present and it was successfully parsed. */ | |
184 | ||
185 | static bool | |
186 | parse_affinity (void) | |
187 | { | |
188 | char *env, *end; | |
189 | unsigned long cpu_beg, cpu_end, cpu_stride; | |
190 | unsigned short *cpus = NULL; | |
191 | size_t allocated = 0, used = 0, needed; | |
192 | ||
193 | env = getenv ("GOMP_CPU_AFFINITY"); | |
194 | if (env == NULL) | |
195 | return false; | |
196 | ||
197 | do | |
198 | { | |
199 | while (*env == ' ' || *env == '\t') | |
200 | env++; | |
201 | ||
202 | cpu_beg = strtoul (env, &end, 0); | |
203 | cpu_end = cpu_beg; | |
204 | cpu_stride = 1; | |
205 | if (env == end || cpu_beg >= 65536) | |
206 | goto invalid; | |
207 | ||
208 | env = end; | |
209 | if (*env == '-') | |
210 | { | |
211 | cpu_end = strtoul (++env, &end, 0); | |
212 | if (env == end || cpu_end >= 65536 || cpu_end < cpu_beg) | |
213 | goto invalid; | |
214 | ||
215 | env = end; | |
216 | if (*env == ':') | |
217 | { | |
218 | cpu_stride = strtoul (++env, &end, 0); | |
219 | if (env == end || cpu_stride == 0 || cpu_stride >= 65536) | |
220 | goto invalid; | |
221 | ||
222 | env = end; | |
223 | } | |
224 | } | |
225 | ||
226 | needed = (cpu_end - cpu_beg) / cpu_stride + 1; | |
227 | if (used + needed >= allocated) | |
228 | { | |
229 | unsigned short *new_cpus; | |
230 | ||
231 | if (allocated < 64) | |
232 | allocated = 64; | |
233 | if (allocated > needed) | |
234 | allocated <<= 1; | |
235 | else | |
236 | allocated += 2 * needed; | |
237 | new_cpus = realloc (cpus, allocated * sizeof (unsigned short)); | |
238 | if (new_cpus == NULL) | |
239 | { | |
240 | free (cpus); | |
241 | gomp_error ("not enough memory to store GOMP_CPU_AFFINITY list"); | |
242 | return false; | |
243 | } | |
244 | ||
245 | cpus = new_cpus; | |
246 | } | |
247 | ||
248 | while (needed--) | |
249 | { | |
250 | cpus[used++] = cpu_beg; | |
251 | cpu_beg += cpu_stride; | |
252 | } | |
253 | ||
254 | while (*env == ' ' || *env == '\t') | |
255 | env++; | |
256 | ||
257 | if (*env == ',') | |
258 | env++; | |
259 | else if (*env == '\0') | |
260 | break; | |
261 | } | |
262 | while (1); | |
263 | ||
264 | gomp_cpu_affinity = cpus; | |
265 | gomp_cpu_affinity_len = used; | |
266 | return true; | |
267 | ||
268 | invalid: | |
269 | gomp_error ("Invalid value for enviroment variable GOMP_CPU_AFFINITY"); | |
270 | return false; | |
271 | } | |
272 | ||
953ff289 DN |
273 | static void __attribute__((constructor)) |
274 | initialize_env (void) | |
275 | { | |
d0d1b24d RH |
276 | unsigned long stacksize; |
277 | ||
953ff289 DN |
278 | /* Do a compile time check that mkomp_h.pl did good job. */ |
279 | omp_check_defines (); | |
280 | ||
281 | parse_schedule (); | |
282 | parse_boolean ("OMP_DYNAMIC", &gomp_dyn_var); | |
283 | parse_boolean ("OMP_NESTED", &gomp_nest_var); | |
d0d1b24d | 284 | if (!parse_unsigned_long ("OMP_NUM_THREADS", &gomp_nthreads_var)) |
953ff289 | 285 | gomp_init_num_threads (); |
a0884cf0 JJ |
286 | if (parse_affinity ()) |
287 | gomp_init_affinity (); | |
d0d1b24d RH |
288 | |
289 | /* Not strictly environment related, but ordering constructors is tricky. */ | |
290 | pthread_attr_init (&gomp_thread_attr); | |
291 | pthread_attr_setdetachstate (&gomp_thread_attr, PTHREAD_CREATE_DETACHED); | |
292 | ||
c3b11a40 | 293 | if (parse_unsigned_long ("GOMP_STACKSIZE", &stacksize)) |
d0d1b24d | 294 | { |
c3b11a40 RH |
295 | int err; |
296 | ||
d0d1b24d | 297 | stacksize *= 1024; |
c3b11a40 RH |
298 | err = pthread_attr_setstacksize (&gomp_thread_attr, stacksize); |
299 | ||
300 | #ifdef PTHREAD_STACK_MIN | |
301 | if (err == EINVAL) | |
d0d1b24d | 302 | { |
c3b11a40 RH |
303 | if (stacksize < PTHREAD_STACK_MIN) |
304 | gomp_error ("Stack size less than minimum of %luk", | |
305 | PTHREAD_STACK_MIN / 1024ul | |
306 | + (PTHREAD_STACK_MIN % 1024 != 0)); | |
307 | else | |
d0d1b24d | 308 | gomp_error ("Stack size larger than system limit"); |
d0d1b24d | 309 | } |
c3b11a40 RH |
310 | else |
311 | #endif | |
312 | if (err != 0) | |
313 | gomp_error ("Stack size change failed: %s", strerror (err)); | |
d0d1b24d | 314 | } |
953ff289 DN |
315 | } |
316 | ||
317 | \f | |
318 | /* The public OpenMP API routines that access these variables. */ | |
319 | ||
320 | void | |
321 | omp_set_num_threads (int n) | |
322 | { | |
62bd6216 | 323 | gomp_nthreads_var = (n > 0 ? n : 1); |
953ff289 DN |
324 | } |
325 | ||
326 | void | |
327 | omp_set_dynamic (int val) | |
328 | { | |
329 | gomp_dyn_var = val; | |
330 | } | |
331 | ||
332 | int | |
333 | omp_get_dynamic (void) | |
334 | { | |
335 | return gomp_dyn_var; | |
336 | } | |
337 | ||
338 | void | |
339 | omp_set_nested (int val) | |
340 | { | |
341 | gomp_nest_var = val; | |
342 | } | |
343 | ||
344 | int | |
345 | omp_get_nested (void) | |
346 | { | |
347 | return gomp_nest_var; | |
348 | } | |
349 | ||
350 | ialias (omp_set_dynamic) | |
351 | ialias (omp_set_nested) | |
352 | ialias (omp_set_num_threads) | |
353 | ialias (omp_get_dynamic) | |
354 | ialias (omp_get_nested) |