1169695Skan/* Copyright (C) 2005 Free Software Foundation, Inc.
2169695Skan   Contributed by Richard Henderson <rth@redhat.com>.
3169695Skan
4169695Skan   This file is part of the GNU OpenMP Library (libgomp).
5169695Skan
6169695Skan   Libgomp is free software; you can redistribute it and/or modify it
7169695Skan   under the terms of the GNU Lesser General Public License as published by
8169695Skan   the Free Software Foundation; either version 2.1 of the License, or
9169695Skan   (at your option) any later version.
10169695Skan
11169695Skan   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
12169695Skan   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13169695Skan   FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
14169695Skan   more details.
15169695Skan
16169695Skan   You should have received a copy of the GNU Lesser General Public License
17169695Skan   along with libgomp; see the file COPYING.LIB.  If not, write to the
18169695Skan   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
19169695Skan   MA 02110-1301, USA.  */
20169695Skan
21169695Skan/* As a special exception, if you link this library with other files, some
22169695Skan   of which are compiled with GCC, to produce an executable, this library
23169695Skan   does not by itself cause the resulting executable to be covered by the
24169695Skan   GNU General Public License.  This exception does not however invalidate
25169695Skan   any other reasons why the executable file might be covered by the GNU
26169695Skan   General Public License.  */
27169695Skan
28169695Skan/* This is the default implementation of a barrier synchronization mechanism
29169695Skan   for libgomp.  This type is private to the library.  Note that we rely on
30169695Skan   being able to adjust the barrier count while threads are blocked, so the
31169695Skan   POSIX pthread_barrier_t won't work.  */
32169695Skan
33169695Skan#ifndef GOMP_BARRIER_H
34169695Skan#define GOMP_BARRIER_H 1
35169695Skan
36169695Skan#include <pthread.h>
37169695Skan
38169695Skantypedef struct
39169695Skan{
40169695Skan  gomp_mutex_t mutex1;
41169695Skan#ifndef HAVE_SYNC_BUILTINS
42169695Skan  gomp_mutex_t mutex2;
43169695Skan#endif
44169695Skan  gomp_sem_t sem1;
45169695Skan  gomp_sem_t sem2;
46169695Skan  unsigned total;
47169695Skan  unsigned arrived;
48169695Skan} gomp_barrier_t;
49169695Skan
50169695Skanextern void gomp_barrier_init (gomp_barrier_t *, unsigned);
51169695Skanextern void gomp_barrier_reinit (gomp_barrier_t *, unsigned);
52169695Skanextern void gomp_barrier_destroy (gomp_barrier_t *);
53169695Skan
54169695Skanextern void gomp_barrier_wait (gomp_barrier_t *);
55169695Skanextern void gomp_barrier_wait_end (gomp_barrier_t *, bool);
56169695Skan
57169695Skanstatic inline bool gomp_barrier_wait_start (gomp_barrier_t *bar)
58169695Skan{
59169695Skan  gomp_mutex_lock (&bar->mutex1);
60169695Skan  return ++bar->arrived == bar->total;
61169695Skan}
62169695Skan
63169695Skan#endif /* GOMP_BARRIER_H */
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