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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc2/] [libgomp/] [single.c] - Rev 384
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/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc. Contributed by Richard Henderson <rth@redhat.com>. This file is part of the GNU OpenMP Library (libgomp). Libgomp is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ /* This file handles the SINGLE construct. */ #include "libgomp.h" /* This routine is called when first encountering a SINGLE construct that doesn't have a COPYPRIVATE clause. Returns true if this is the thread that should execute the clause. */ bool GOMP_single_start (void) { #ifdef HAVE_SYNC_BUILTINS struct gomp_thread *thr = gomp_thread (); struct gomp_team *team = thr->ts.team; unsigned long single_count; if (__builtin_expect (team == NULL, 0)) return true; single_count = thr->ts.single_count++; return __sync_bool_compare_and_swap (&team->single_count, single_count, single_count + 1L); #else bool ret = gomp_work_share_start (false); if (ret) gomp_work_share_init_done (); gomp_work_share_end_nowait (); return ret; #endif } /* This routine is called when first encountering a SINGLE construct that does have a COPYPRIVATE clause. Returns NULL if this is the thread that should execute the clause; otherwise the return value is pointer given to GOMP_single_copy_end by the thread that did execute the clause. */ void * GOMP_single_copy_start (void) { struct gomp_thread *thr = gomp_thread (); bool first; void *ret; first = gomp_work_share_start (false); if (first) { gomp_work_share_init_done (); ret = NULL; } else { gomp_team_barrier_wait (&thr->ts.team->barrier); ret = thr->ts.work_share->copyprivate; gomp_work_share_end_nowait (); } return ret; } /* This routine is called when the thread that entered a SINGLE construct with a COPYPRIVATE clause gets to the end of the construct. */ void GOMP_single_copy_end (void *data) { struct gomp_thread *thr = gomp_thread (); struct gomp_team *team = thr->ts.team; if (team != NULL) { thr->ts.work_share->copyprivate = data; gomp_team_barrier_wait (&team->barrier); } gomp_work_share_end_nowait (); }