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1 /* Copyright (C) 2005, 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 SINGLE 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 /* This routine is called when first encountering a SINGLE construct that
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31 doesn't have a COPYPRIVATE clause. Returns true if this is the thread
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32 that should execute the clause. */
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33
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34 bool
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35 GOMP_single_start (void)
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36 {
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37 #ifdef HAVE_SYNC_BUILTINS
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38 struct gomp_thread *thr = gomp_thread ();
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39 struct gomp_team *team = thr->ts.team;
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40 unsigned long single_count;
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41
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42 if (__builtin_expect (team == NULL, 0))
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43 return true;
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44
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45 single_count = thr->ts.single_count++;
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46 return __sync_bool_compare_and_swap (&team->single_count, single_count,
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47 single_count + 1L);
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48 #else
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49 bool ret = gomp_work_share_start (false);
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50 if (ret)
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51 gomp_work_share_init_done ();
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52 gomp_work_share_end_nowait ();
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53 return ret;
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54 #endif
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55 }
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56
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57 /* This routine is called when first encountering a SINGLE construct that
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58 does have a COPYPRIVATE clause. Returns NULL if this is the thread
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59 that should execute the clause; otherwise the return value is pointer
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60 given to GOMP_single_copy_end by the thread that did execute the clause. */
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61
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62 void *
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63 GOMP_single_copy_start (void)
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64 {
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65 struct gomp_thread *thr = gomp_thread ();
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66
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67 bool first;
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68 void *ret;
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69
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70 first = gomp_work_share_start (false);
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71
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72 if (first)
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73 {
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74 gomp_work_share_init_done ();
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75 ret = NULL;
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76 }
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77 else
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78 {
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79 gomp_team_barrier_wait (&thr->ts.team->barrier);
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80
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81 ret = thr->ts.work_share->copyprivate;
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82 gomp_work_share_end_nowait ();
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83 }
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84
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85 return ret;
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86 }
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87
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88 /* This routine is called when the thread that entered a SINGLE construct
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89 with a COPYPRIVATE clause gets to the end of the construct. */
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90
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91 void
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92 GOMP_single_copy_end (void *data)
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93 {
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94 struct gomp_thread *thr = gomp_thread ();
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95 struct gomp_team *team = thr->ts.team;
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96
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97 if (team != NULL)
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98 {
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99 thr->ts.work_share->copyprivate = data;
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100 gomp_team_barrier_wait (&team->barrier);
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101 }
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102
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103 gomp_work_share_end_nowait ();
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104 }
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