1 /*
2 * pthread_barrier_init.c
3 *
4 * Description:
5 * This translation unit implements barrier primitives.
6 *
7 * --------------------------------------------------------------------------
8 *
9 * Pthreads-win32 - POSIX Threads Library for Win32
10 * Copyright(C) 1998 John E. Bossom
11 * Copyright(C) 1999,2005 Pthreads-win32 contributors
12 *
13 * Contact Email: rpj@callisto.canberra.edu.au
14 *
15 * The current list of contributors is contained
16 * in the file CONTRIBUTORS included with the source
17 * code distribution. The list can also be seen at the
18 * following World Wide Web location:
19 * http://sources.redhat.com/pthreads-win32/contributors.html
20 *
21 * This library is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU Lesser General Public
23 * License as published by the Free Software Foundation; either
24 * version 2 of the License, or (at your option) any later version.
25 *
26 * This library is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
29 * Lesser General Public License for more details.
30 *
31 * You should have received a copy of the GNU Lesser General Public
32 * License along with this library in the file COPYING.LIB;
33 * if not, write to the Free Software Foundation, Inc.,
34 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
35 */
36
37 #include "pthread.h"
38 #include "implement.h"
39
40
41 int
pthread_barrier_init(pthread_barrier_t * barrier,const pthread_barrierattr_t * attr,unsigned int count)42 pthread_barrier_init (pthread_barrier_t * barrier,
43 const pthread_barrierattr_t * attr, unsigned int count)
44 {
45 pthread_barrier_t b;
46
47 if (barrier == NULL || count == 0)
48 {
49 return EINVAL;
50 }
51
52 if (NULL != (b = (pthread_barrier_t) calloc (1, sizeof (*b))))
53 {
54 b->pshared = (attr != NULL && *attr != NULL
55 ? (*attr)->pshared : PTHREAD_PROCESS_PRIVATE);
56
57 b->nCurrentBarrierHeight = b->nInitialBarrierHeight = count;
58 b->lock = 0;
59
60 if (0 == sem_init (&(b->semBarrierBreeched), b->pshared, 0))
61 {
62 *barrier = b;
63 return 0;
64 }
65 (void) free (b);
66 }
67
68 return ENOMEM;
69 }
70