1 /* Copyright (C) 2005 Free Software Foundation, Inc. 2 Contributed by Richard Henderson <rth@redhat.com>. 3 4 This file is part of the GNU OpenMP Library (libgomp). 5 6 Libgomp is free software; you can redistribute it and/or modify it 7 under the terms of the GNU Lesser General Public License as published by 8 the Free Software Foundation; either version 2.1 of the License, or 9 (at your option) any later version. 10 11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 13 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for 14 more details. 15 16 You should have received a copy of the GNU Lesser General Public License 17 along with libgomp; see the file COPYING.LIB. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21 /* As a special exception, if you link this library with other files, some 22 of which are compiled with GCC, to produce an executable, this library 23 does not by itself cause the resulting executable to be covered by the 24 GNU General Public License. This exception does not however invalidate 25 any other reasons why the executable file might be covered by the GNU 26 General Public License. */ 27 28 /* This file handles the SINGLE construct. */ 29 30 #include "libgomp.h" 31 32 33 /* This routine is called when first encountering a SINGLE construct that 34 doesn't have a COPYPRIVATE clause. Returns true if this is the thread 35 that should execute the clause. */ 36 37 bool 38 GOMP_single_start (void) 39 { 40 bool ret = gomp_work_share_start (false); 41 gomp_mutex_unlock (&gomp_thread ()->ts.work_share->lock); 42 gomp_work_share_end_nowait (); 43 return ret; 44 } 45 46 /* This routine is called when first encountering a SINGLE construct that 47 does have a COPYPRIVATE clause. Returns NULL if this is the thread 48 that should execute the clause; otherwise the return value is pointer 49 given to GOMP_single_copy_end by the thread that did execute the clause. */ 50 51 void * 52 GOMP_single_copy_start (void) 53 { 54 struct gomp_thread *thr = gomp_thread (); 55 56 bool first; 57 void *ret; 58 59 first = gomp_work_share_start (false); 60 gomp_mutex_unlock (&thr->ts.work_share->lock); 61 62 if (first) 63 ret = NULL; 64 else 65 { 66 gomp_barrier_wait (&thr->ts.team->barrier); 67 68 ret = thr->ts.work_share->copyprivate; 69 gomp_work_share_end_nowait (); 70 } 71 72 return ret; 73 } 74 75 /* This routine is called when the thread that entered a SINGLE construct 76 with a COPYPRIVATE clause gets to the end of the construct. */ 77 78 void 79 GOMP_single_copy_end (void *data) 80 { 81 struct gomp_thread *thr = gomp_thread (); 82 struct gomp_team *team = thr->ts.team; 83 84 if (team != NULL) 85 { 86 thr->ts.work_share->copyprivate = data; 87 gomp_barrier_wait (&team->barrier); 88 } 89 90 gomp_work_share_end_nowait (); 91 } 92