barrier.h revision 297077 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2002 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#ifndef _BARRIER_H
28#define	_BARRIER_H
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32/*
33 * APIs for the barrier synchronization primitive.
34 */
35
36#ifdef illumos
37#include <synch.h>
38#else
39#include <semaphore.h>
40typedef sem_t	sema_t;
41#endif
42
43#ifdef __cplusplus
44extern "C" {
45#endif
46
47typedef struct barrier {
48	pthread_mutex_t bar_lock;	/* protects bar_numin */
49	int bar_numin;			/* current number of waiters */
50
51	sema_t bar_sem;			/* where everyone waits */
52	int bar_nthr;			/* # of waiters to trigger release */
53} barrier_t;
54
55extern void barrier_init(barrier_t *, int);
56extern int barrier_wait(barrier_t *);
57
58#ifdef __cplusplus
59}
60#endif
61
62#endif /* _BARRIER_H */
63