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7adcbafe | 1 | /* Copyright (C) 2005-2022 Free Software Foundation, Inc. |
953ff289 DN |
2 | Contributed by Richard Henderson <rth@redhat.com>. |
3 | ||
f1f3453e TS |
4 | This file is part of the GNU Offloading and Multi Processing Library |
5 | (libgomp). | |
953ff289 DN |
6 | |
7 | Libgomp is free software; you can redistribute it and/or modify it | |
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8 | under the terms of the GNU General Public License as published by |
9 | the Free Software Foundation; either version 3, or (at your option) | |
10 | any later version. | |
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11 | |
12 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
748086b7 | 14 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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15 | more details. |
16 | ||
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17 | Under Section 7 of GPL version 3, you are granted additional |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
953ff289 DN |
25 | |
26 | /* This file handles the SECTIONS construct. */ | |
27 | ||
28 | #include "libgomp.h" | |
28567c40 | 29 | #include <string.h> |
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30 | |
31 | ||
28567c40 JJ |
32 | ialias_redirect (GOMP_taskgroup_reduction_register) |
33 | ||
953ff289 DN |
34 | /* Initialize the given work share construct from the given arguments. */ |
35 | ||
36 | static inline void | |
37 | gomp_sections_init (struct gomp_work_share *ws, unsigned count) | |
38 | { | |
39 | ws->sched = GFS_DYNAMIC; | |
40 | ws->chunk_size = 1; | |
5221d7a9 | 41 | ws->end = count + 1L; |
953ff289 DN |
42 | ws->incr = 1; |
43 | ws->next = 1; | |
5221d7a9 JJ |
44 | #ifdef HAVE_SYNC_BUILTINS |
45 | /* Prepare things to make each iteration faster. */ | |
46 | if (sizeof (long) > sizeof (unsigned)) | |
47 | ws->mode = 1; | |
48 | else | |
49 | { | |
50 | struct gomp_thread *thr = gomp_thread (); | |
51 | struct gomp_team *team = thr->ts.team; | |
52 | long nthreads = team ? team->nthreads : 1; | |
53 | ||
54 | ws->mode = ((nthreads | ws->end) | |
55 | < 1UL << (sizeof (long) * __CHAR_BIT__ / 2 - 1)); | |
56 | } | |
57 | #else | |
58 | ws->mode = 0; | |
59 | #endif | |
953ff289 DN |
60 | } |
61 | ||
62 | /* This routine is called when first encountering a sections construct | |
63 | that is not bound directly to a parallel construct. The first thread | |
64 | that arrives will create the work-share construct; subsequent threads | |
65 | will see the construct exists and allocate work from it. | |
66 | ||
67 | COUNT is the number of sections in this construct. | |
68 | ||
69 | Returns the 1-based section number for this thread to perform, or 0 if | |
70 | all work was assigned to other threads prior to this thread's arrival. */ | |
71 | ||
72 | unsigned | |
73 | GOMP_sections_start (unsigned count) | |
74 | { | |
75 | struct gomp_thread *thr = gomp_thread (); | |
76 | long s, e, ret; | |
77 | ||
28567c40 | 78 | if (gomp_work_share_start (0)) |
a68ab351 JJ |
79 | { |
80 | gomp_sections_init (thr->ts.work_share, count); | |
81 | gomp_work_share_init_done (); | |
82 | } | |
953ff289 | 83 | |
a68ab351 JJ |
84 | #ifdef HAVE_SYNC_BUILTINS |
85 | if (gomp_iter_dynamic_next (&s, &e)) | |
86 | ret = s; | |
87 | else | |
88 | ret = 0; | |
89 | #else | |
90 | gomp_mutex_lock (&thr->ts.work_share->lock); | |
953ff289 DN |
91 | if (gomp_iter_dynamic_next_locked (&s, &e)) |
92 | ret = s; | |
93 | else | |
94 | ret = 0; | |
953ff289 | 95 | gomp_mutex_unlock (&thr->ts.work_share->lock); |
a68ab351 | 96 | #endif |
953ff289 DN |
97 | |
98 | return ret; | |
99 | } | |
100 | ||
28567c40 JJ |
101 | unsigned |
102 | GOMP_sections2_start (unsigned count, uintptr_t *reductions, void **mem) | |
103 | { | |
104 | struct gomp_thread *thr = gomp_thread (); | |
105 | long s, e, ret; | |
106 | ||
107 | if (reductions) | |
108 | gomp_workshare_taskgroup_start (); | |
109 | if (gomp_work_share_start (0)) | |
110 | { | |
111 | gomp_sections_init (thr->ts.work_share, count); | |
112 | if (reductions) | |
113 | { | |
114 | GOMP_taskgroup_reduction_register (reductions); | |
115 | thr->task->taskgroup->workshare = true; | |
116 | thr->ts.work_share->task_reductions = reductions; | |
117 | } | |
118 | if (mem) | |
119 | { | |
120 | uintptr_t size = (uintptr_t) *mem; | |
fcfb8032 JJ |
121 | #define INLINE_ORDERED_TEAM_IDS_OFF \ |
122 | ((offsetof (struct gomp_work_share, inline_ordered_team_ids) \ | |
123 | + __alignof__ (long long) - 1) & ~(__alignof__ (long long) - 1)) | |
28567c40 | 124 | if (size > (sizeof (struct gomp_work_share) |
fcfb8032 JJ |
125 | - INLINE_ORDERED_TEAM_IDS_OFF)) |
126 | *mem | |
127 | = (void *) (thr->ts.work_share->ordered_team_ids | |
128 | = gomp_malloc_cleared (size)); | |
28567c40 | 129 | else |
fcfb8032 JJ |
130 | *mem = memset (((char *) thr->ts.work_share) |
131 | + INLINE_ORDERED_TEAM_IDS_OFF, '\0', size); | |
28567c40 JJ |
132 | } |
133 | gomp_work_share_init_done (); | |
134 | } | |
135 | else | |
136 | { | |
137 | if (reductions) | |
138 | { | |
139 | uintptr_t *first_reductions = thr->ts.work_share->task_reductions; | |
140 | gomp_workshare_task_reduction_register (reductions, | |
141 | first_reductions); | |
142 | } | |
143 | if (mem) | |
fcfb8032 JJ |
144 | { |
145 | if ((offsetof (struct gomp_work_share, inline_ordered_team_ids) | |
146 | & (__alignof__ (long long) - 1)) == 0) | |
147 | *mem = (void *) thr->ts.work_share->ordered_team_ids; | |
148 | else | |
149 | { | |
150 | uintptr_t p = (uintptr_t) thr->ts.work_share->ordered_team_ids; | |
151 | p += __alignof__ (long long) - 1; | |
152 | p &= ~(__alignof__ (long long) - 1); | |
153 | *mem = (void *) p; | |
154 | } | |
155 | } | |
28567c40 JJ |
156 | } |
157 | ||
158 | #ifdef HAVE_SYNC_BUILTINS | |
159 | if (gomp_iter_dynamic_next (&s, &e)) | |
160 | ret = s; | |
161 | else | |
162 | ret = 0; | |
163 | #else | |
164 | gomp_mutex_lock (&thr->ts.work_share->lock); | |
165 | if (gomp_iter_dynamic_next_locked (&s, &e)) | |
166 | ret = s; | |
167 | else | |
168 | ret = 0; | |
169 | gomp_mutex_unlock (&thr->ts.work_share->lock); | |
170 | #endif | |
171 | ||
172 | return ret; | |
173 | } | |
174 | ||
953ff289 DN |
175 | /* This routine is called when the thread completes processing of the |
176 | section currently assigned to it. If the work-share construct is | |
177 | bound directly to a parallel construct, then the construct may have | |
178 | been set up before the parallel. In which case, this may be the | |
179 | first iteration for the thread. | |
180 | ||
181 | Returns the 1-based section number for this thread to perform, or 0 if | |
182 | all work was assigned to other threads prior to this thread's arrival. */ | |
183 | ||
184 | unsigned | |
185 | GOMP_sections_next (void) | |
186 | { | |
953ff289 DN |
187 | long s, e, ret; |
188 | ||
a68ab351 JJ |
189 | #ifdef HAVE_SYNC_BUILTINS |
190 | if (gomp_iter_dynamic_next (&s, &e)) | |
191 | ret = s; | |
192 | else | |
193 | ret = 0; | |
194 | #else | |
195 | struct gomp_thread *thr = gomp_thread (); | |
196 | ||
953ff289 DN |
197 | gomp_mutex_lock (&thr->ts.work_share->lock); |
198 | if (gomp_iter_dynamic_next_locked (&s, &e)) | |
199 | ret = s; | |
200 | else | |
201 | ret = 0; | |
202 | gomp_mutex_unlock (&thr->ts.work_share->lock); | |
a68ab351 | 203 | #endif |
953ff289 DN |
204 | |
205 | return ret; | |
206 | } | |
207 | ||
208 | /* This routine pre-initializes a work-share construct to avoid one | |
209 | synchronization once we get into the loop. */ | |
210 | ||
211 | void | |
212 | GOMP_parallel_sections_start (void (*fn) (void *), void *data, | |
213 | unsigned num_threads, unsigned count) | |
214 | { | |
a68ab351 | 215 | struct gomp_team *team; |
953ff289 | 216 | |
a68ab351 JJ |
217 | num_threads = gomp_resolve_num_threads (num_threads, count); |
218 | team = gomp_new_team (num_threads); | |
219 | gomp_sections_init (&team->work_shares[0], count); | |
28567c40 | 220 | gomp_team_start (fn, data, num_threads, 0, team, NULL); |
acf0174b JJ |
221 | } |
222 | ||
223 | ialias_redirect (GOMP_parallel_end) | |
224 | ||
225 | void | |
226 | GOMP_parallel_sections (void (*fn) (void *), void *data, | |
227 | unsigned num_threads, unsigned count, unsigned flags) | |
228 | { | |
229 | struct gomp_team *team; | |
230 | ||
231 | num_threads = gomp_resolve_num_threads (num_threads, count); | |
232 | team = gomp_new_team (num_threads); | |
233 | gomp_sections_init (&team->work_shares[0], count); | |
28567c40 | 234 | gomp_team_start (fn, data, num_threads, flags, team, NULL); |
acf0174b JJ |
235 | fn (data); |
236 | GOMP_parallel_end (); | |
953ff289 DN |
237 | } |
238 | ||
239 | /* The GOMP_section_end* routines are called after the thread is told | |
acf0174b | 240 | that all sections are complete. The first two versions synchronize |
953ff289 DN |
241 | all threads; the nowait version does not. */ |
242 | ||
243 | void | |
244 | GOMP_sections_end (void) | |
245 | { | |
246 | gomp_work_share_end (); | |
247 | } | |
248 | ||
acf0174b JJ |
249 | bool |
250 | GOMP_sections_end_cancel (void) | |
251 | { | |
252 | return gomp_work_share_end_cancel (); | |
253 | } | |
254 | ||
953ff289 DN |
255 | void |
256 | GOMP_sections_end_nowait (void) | |
257 | { | |
258 | gomp_work_share_end_nowait (); | |
259 | } |