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1 /* Copyright (C) 2005-2017 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 Offloading and Multi Processing Library
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5 (libgomp).
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6
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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
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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14 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 /* This file handles the SINGLE construct. */
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27
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28 #include "libgomp.h"
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29
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30
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31 /* This routine is called when first encountering a SINGLE construct that
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32 doesn't have a COPYPRIVATE clause. Returns true if this is the thread
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33 that should execute the clause. */
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34
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35 bool
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36 GOMP_single_start (void)
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37 {
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38 #ifdef HAVE_SYNC_BUILTINS
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39 struct gomp_thread *thr = gomp_thread ();
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40 struct gomp_team *team = thr->ts.team;
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41 unsigned long single_count;
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42
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43 if (__builtin_expect (team == NULL, 0))
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44 return true;
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45
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46 single_count = thr->ts.single_count++;
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47 return __sync_bool_compare_and_swap (&team->single_count, single_count,
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48 single_count + 1L);
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49 #else
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50 bool ret = gomp_work_share_start (false);
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51 if (ret)
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52 gomp_work_share_init_done ();
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53 gomp_work_share_end_nowait ();
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54 return ret;
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55 #endif
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56 }
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57
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58 /* This routine is called when first encountering a SINGLE construct that
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59 does have a COPYPRIVATE clause. Returns NULL if this is the thread
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60 that should execute the clause; otherwise the return value is pointer
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61 given to GOMP_single_copy_end by the thread that did execute the clause. */
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62
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63 void *
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64 GOMP_single_copy_start (void)
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65 {
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66 struct gomp_thread *thr = gomp_thread ();
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67
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68 bool first;
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69 void *ret;
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70
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71 first = gomp_work_share_start (false);
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72
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73 if (first)
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74 {
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75 gomp_work_share_init_done ();
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76 ret = NULL;
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77 }
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78 else
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79 {
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80 gomp_team_barrier_wait (&thr->ts.team->barrier);
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81
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82 ret = thr->ts.work_share->copyprivate;
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83 gomp_work_share_end_nowait ();
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84 }
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85
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86 return ret;
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87 }
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88
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89 /* This routine is called when the thread that entered a SINGLE construct
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90 with a COPYPRIVATE clause gets to the end of the construct. */
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91
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92 void
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93 GOMP_single_copy_end (void *data)
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94 {
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95 struct gomp_thread *thr = gomp_thread ();
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96 struct gomp_team *team = thr->ts.team;
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97
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98 if (team != NULL)
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99 {
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100 thr->ts.work_share->copyprivate = data;
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101 gomp_team_barrier_wait (&team->barrier);
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102 }
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103
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104 gomp_work_share_end_nowait ();
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105 }
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