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f1717362 | 1 | /* Copyright (C) 2005-2016 Free Software Foundation, Inc. |
1e8e9920 | 2 | Contributed by Richard Henderson <rth@redhat.com>. |
3 | ||
c35c9a62 | 4 | This file is part of the GNU Offloading and Multi Processing Library |
5 | (libgomp). | |
1e8e9920 | 6 | |
7 | Libgomp is free software; you can redistribute it and/or modify it | |
6bc9506f | 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. | |
1e8e9920 | 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 | |
6bc9506f | 14 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
1e8e9920 | 15 | more details. |
16 | ||
6bc9506f | 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/>. */ | |
1e8e9920 | 25 | |
26 | /* This file handles the SECTIONS construct. */ | |
27 | ||
28 | #include "libgomp.h" | |
29 | ||
30 | ||
31 | /* Initialize the given work share construct from the given arguments. */ | |
32 | ||
33 | static inline void | |
34 | gomp_sections_init (struct gomp_work_share *ws, unsigned count) | |
35 | { | |
36 | ws->sched = GFS_DYNAMIC; | |
37 | ws->chunk_size = 1; | |
c3e85a57 | 38 | ws->end = count + 1L; |
1e8e9920 | 39 | ws->incr = 1; |
40 | ws->next = 1; | |
c3e85a57 | 41 | #ifdef HAVE_SYNC_BUILTINS |
42 | /* Prepare things to make each iteration faster. */ | |
43 | if (sizeof (long) > sizeof (unsigned)) | |
44 | ws->mode = 1; | |
45 | else | |
46 | { | |
47 | struct gomp_thread *thr = gomp_thread (); | |
48 | struct gomp_team *team = thr->ts.team; | |
49 | long nthreads = team ? team->nthreads : 1; | |
50 | ||
51 | ws->mode = ((nthreads | ws->end) | |
52 | < 1UL << (sizeof (long) * __CHAR_BIT__ / 2 - 1)); | |
53 | } | |
54 | #else | |
55 | ws->mode = 0; | |
56 | #endif | |
1e8e9920 | 57 | } |
58 | ||
59 | /* This routine is called when first encountering a sections construct | |
60 | that is not bound directly to a parallel construct. The first thread | |
61 | that arrives will create the work-share construct; subsequent threads | |
62 | will see the construct exists and allocate work from it. | |
63 | ||
64 | COUNT is the number of sections in this construct. | |
65 | ||
66 | Returns the 1-based section number for this thread to perform, or 0 if | |
67 | all work was assigned to other threads prior to this thread's arrival. */ | |
68 | ||
69 | unsigned | |
70 | GOMP_sections_start (unsigned count) | |
71 | { | |
72 | struct gomp_thread *thr = gomp_thread (); | |
73 | long s, e, ret; | |
74 | ||
75 | if (gomp_work_share_start (false)) | |
fd6481cf | 76 | { |
77 | gomp_sections_init (thr->ts.work_share, count); | |
78 | gomp_work_share_init_done (); | |
79 | } | |
1e8e9920 | 80 | |
fd6481cf | 81 | #ifdef HAVE_SYNC_BUILTINS |
82 | if (gomp_iter_dynamic_next (&s, &e)) | |
83 | ret = s; | |
84 | else | |
85 | ret = 0; | |
86 | #else | |
87 | gomp_mutex_lock (&thr->ts.work_share->lock); | |
1e8e9920 | 88 | if (gomp_iter_dynamic_next_locked (&s, &e)) |
89 | ret = s; | |
90 | else | |
91 | ret = 0; | |
1e8e9920 | 92 | gomp_mutex_unlock (&thr->ts.work_share->lock); |
fd6481cf | 93 | #endif |
1e8e9920 | 94 | |
95 | return ret; | |
96 | } | |
97 | ||
98 | /* This routine is called when the thread completes processing of the | |
99 | section currently assigned to it. If the work-share construct is | |
100 | bound directly to a parallel construct, then the construct may have | |
101 | been set up before the parallel. In which case, this may be the | |
102 | first iteration for the thread. | |
103 | ||
104 | Returns the 1-based section number for this thread to perform, or 0 if | |
105 | all work was assigned to other threads prior to this thread's arrival. */ | |
106 | ||
107 | unsigned | |
108 | GOMP_sections_next (void) | |
109 | { | |
1e8e9920 | 110 | long s, e, ret; |
111 | ||
fd6481cf | 112 | #ifdef HAVE_SYNC_BUILTINS |
113 | if (gomp_iter_dynamic_next (&s, &e)) | |
114 | ret = s; | |
115 | else | |
116 | ret = 0; | |
117 | #else | |
118 | struct gomp_thread *thr = gomp_thread (); | |
119 | ||
1e8e9920 | 120 | gomp_mutex_lock (&thr->ts.work_share->lock); |
121 | if (gomp_iter_dynamic_next_locked (&s, &e)) | |
122 | ret = s; | |
123 | else | |
124 | ret = 0; | |
125 | gomp_mutex_unlock (&thr->ts.work_share->lock); | |
fd6481cf | 126 | #endif |
1e8e9920 | 127 | |
128 | return ret; | |
129 | } | |
130 | ||
131 | /* This routine pre-initializes a work-share construct to avoid one | |
132 | synchronization once we get into the loop. */ | |
133 | ||
134 | void | |
135 | GOMP_parallel_sections_start (void (*fn) (void *), void *data, | |
136 | unsigned num_threads, unsigned count) | |
137 | { | |
fd6481cf | 138 | struct gomp_team *team; |
1e8e9920 | 139 | |
fd6481cf | 140 | num_threads = gomp_resolve_num_threads (num_threads, count); |
141 | team = gomp_new_team (num_threads); | |
142 | gomp_sections_init (&team->work_shares[0], count); | |
bc7bff74 | 143 | gomp_team_start (fn, data, num_threads, 0, team); |
144 | } | |
145 | ||
146 | ialias_redirect (GOMP_parallel_end) | |
147 | ||
148 | void | |
149 | GOMP_parallel_sections (void (*fn) (void *), void *data, | |
150 | unsigned num_threads, unsigned count, unsigned flags) | |
151 | { | |
152 | struct gomp_team *team; | |
153 | ||
154 | num_threads = gomp_resolve_num_threads (num_threads, count); | |
155 | team = gomp_new_team (num_threads); | |
156 | gomp_sections_init (&team->work_shares[0], count); | |
157 | gomp_team_start (fn, data, num_threads, flags, team); | |
158 | fn (data); | |
159 | GOMP_parallel_end (); | |
1e8e9920 | 160 | } |
161 | ||
162 | /* The GOMP_section_end* routines are called after the thread is told | |
bc7bff74 | 163 | that all sections are complete. The first two versions synchronize |
1e8e9920 | 164 | all threads; the nowait version does not. */ |
165 | ||
166 | void | |
167 | GOMP_sections_end (void) | |
168 | { | |
169 | gomp_work_share_end (); | |
170 | } | |
171 | ||
bc7bff74 | 172 | bool |
173 | GOMP_sections_end_cancel (void) | |
174 | { | |
175 | return gomp_work_share_end_cancel (); | |
176 | } | |
177 | ||
1e8e9920 | 178 | void |
179 | GOMP_sections_end_nowait (void) | |
180 | { | |
181 | gomp_work_share_end_nowait (); | |
182 | } |