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 is the default implementation of a barrier synchronization mechanism
29   for libgomp.  This type is private to the library.  Note that we rely on
30   being able to adjust the barrier count while threads are blocked, so the
31   POSIX pthread_barrier_t won't work.  */
32
33#ifndef GOMP_BARRIER_H
34#define GOMP_BARRIER_H 1
35
36#include <pthread.h>
37
38typedef struct
39{
40  gomp_mutex_t mutex1;
41#ifndef HAVE_SYNC_BUILTINS
42  gomp_mutex_t mutex2;
43#endif
44  gomp_sem_t sem1;
45  gomp_sem_t sem2;
46  unsigned total;
47  unsigned arrived;
48} gomp_barrier_t;
49
50extern void gomp_barrier_init (gomp_barrier_t *, unsigned);
51extern void gomp_barrier_reinit (gomp_barrier_t *, unsigned);
52extern void gomp_barrier_destroy (gomp_barrier_t *);
53
54extern void gomp_barrier_wait (gomp_barrier_t *);
55extern void gomp_barrier_wait_end (gomp_barrier_t *, bool);
56
57static inline bool gomp_barrier_wait_start (gomp_barrier_t *bar)
58{
59  gomp_mutex_lock (&bar->mutex1);
60  return ++bar->arrived == bar->total;
61}
62
63#endif /* GOMP_BARRIER_H */
64