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1 /* Copyright (C) 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
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2 Contributed by Richard Henderson <rth@redhat.com>.
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3
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4 This file is part of the GNU OpenMP Library (libgomp).
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5
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6 Libgomp is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* This file handles the SECTIONS construct. */
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26
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27 #include "libgomp.h"
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28
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29
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30 /* Initialize the given work share construct from the given arguments. */
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31
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32 static inline void
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33 gomp_sections_init (struct gomp_work_share *ws, unsigned count)
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34 {
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35 ws->sched = GFS_DYNAMIC;
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36 ws->chunk_size = 1;
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37 ws->end = count + 1;
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38 ws->incr = 1;
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39 ws->next = 1;
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40 }
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41
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42 /* This routine is called when first encountering a sections construct
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43 that is not bound directly to a parallel construct. The first thread
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44 that arrives will create the work-share construct; subsequent threads
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45 will see the construct exists and allocate work from it.
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46
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47 COUNT is the number of sections in this construct.
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48
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49 Returns the 1-based section number for this thread to perform, or 0 if
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50 all work was assigned to other threads prior to this thread's arrival. */
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51
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52 unsigned
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53 GOMP_sections_start (unsigned count)
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54 {
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55 struct gomp_thread *thr = gomp_thread ();
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56 long s, e, ret;
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57
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58 if (gomp_work_share_start (false))
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59 {
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60 gomp_sections_init (thr->ts.work_share, count);
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61 gomp_work_share_init_done ();
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62 }
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63
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64 #ifdef HAVE_SYNC_BUILTINS
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65 if (gomp_iter_dynamic_next (&s, &e))
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66 ret = s;
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67 else
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68 ret = 0;
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69 #else
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70 gomp_mutex_lock (&thr->ts.work_share->lock);
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71 if (gomp_iter_dynamic_next_locked (&s, &e))
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72 ret = s;
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73 else
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74 ret = 0;
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75 gomp_mutex_unlock (&thr->ts.work_share->lock);
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76 #endif
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77
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78 return ret;
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79 }
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80
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81 /* This routine is called when the thread completes processing of the
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82 section currently assigned to it. If the work-share construct is
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83 bound directly to a parallel construct, then the construct may have
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84 been set up before the parallel. In which case, this may be the
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85 first iteration for the thread.
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86
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87 Returns the 1-based section number for this thread to perform, or 0 if
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88 all work was assigned to other threads prior to this thread's arrival. */
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89
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90 unsigned
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91 GOMP_sections_next (void)
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92 {
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93 long s, e, ret;
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94
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95 #ifdef HAVE_SYNC_BUILTINS
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96 if (gomp_iter_dynamic_next (&s, &e))
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97 ret = s;
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98 else
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99 ret = 0;
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100 #else
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101 struct gomp_thread *thr = gomp_thread ();
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102
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103 gomp_mutex_lock (&thr->ts.work_share->lock);
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104 if (gomp_iter_dynamic_next_locked (&s, &e))
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105 ret = s;
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106 else
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107 ret = 0;
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108 gomp_mutex_unlock (&thr->ts.work_share->lock);
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109 #endif
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110
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111 return ret;
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112 }
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113
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114 /* This routine pre-initializes a work-share construct to avoid one
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115 synchronization once we get into the loop. */
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116
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117 void
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118 GOMP_parallel_sections_start (void (*fn) (void *), void *data,
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119 unsigned num_threads, unsigned count)
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120 {
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121 struct gomp_team *team;
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122
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123 num_threads = gomp_resolve_num_threads (num_threads, count);
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124 team = gomp_new_team (num_threads);
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125 gomp_sections_init (&team->work_shares[0], count);
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126 gomp_team_start (fn, data, num_threads, team);
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127 }
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128
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129 /* The GOMP_section_end* routines are called after the thread is told
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130 that all sections are complete. This first version synchronizes
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131 all threads; the nowait version does not. */
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132
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133 void
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134 GOMP_sections_end (void)
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135 {
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136 gomp_work_share_end ();
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137 }
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138
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139 void
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140 GOMP_sections_end_nowait (void)
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141 {
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142 gomp_work_share_end_nowait ();
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143 }
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