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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libgomp/single.c
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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 ();
+}