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+/* Copyright (C) 2005 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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for
+ more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with libgomp; see the file COPYING.LIB. If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ MA 02110-1301, USA. */
+
+/* As a special exception, if you link this library with other files, some
+ of which are compiled with GCC, to produce an executable, this library
+ does not by itself cause the resulting executable to be covered by the
+ GNU General Public License. This exception does not however invalidate
+ any other reasons why the executable file might be covered by the GNU
+ General Public License. */
+
+/* This is the default implementation of a barrier synchronization mechanism
+ for libgomp. This type is private to the library. Note that we rely on
+ being able to adjust the barrier count while threads are blocked, so the
+ POSIX pthread_barrier_t won't work. */
+
+#ifndef GOMP_BARRIER_H
+#define GOMP_BARRIER_H 1
+
+#include <pthread.h>
+
+typedef struct
+{
+ gomp_mutex_t mutex1;
+#ifndef HAVE_SYNC_BUILTINS
+ gomp_mutex_t mutex2;
+#endif
+ gomp_sem_t sem1;
+ gomp_sem_t sem2;
+ unsigned total;
+ unsigned arrived;
+} gomp_barrier_t;
+
+extern void gomp_barrier_init (gomp_barrier_t *, unsigned);
+extern void gomp_barrier_reinit (gomp_barrier_t *, unsigned);
+extern void gomp_barrier_destroy (gomp_barrier_t *);
+
+extern void gomp_barrier_wait (gomp_barrier_t *);
+extern void gomp_barrier_wait_end (gomp_barrier_t *, bool);
+
+static inline bool gomp_barrier_wait_start (gomp_barrier_t *bar)
+{
+ gomp_mutex_lock (&bar->mutex1);
+ return ++bar->arrived == bar->total;
+}
+
+#endif /* GOMP_BARRIER_H */