/[pcsx2_0.9.7]/trunk/3rdparty/w32pthreads/pthread_barrier_init.c
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Contents of /trunk/3rdparty/w32pthreads/pthread_barrier_init.c

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Revision 31 - (show annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (9 years, 11 months ago) by william
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committing r3113 initial commit again...
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 "ptw32pch.h"
38
39
40 int
41 pthread_barrier_init (pthread_barrier_t * barrier,
42 const pthread_barrierattr_t * attr, unsigned int count)
43 {
44 pthread_barrier_t b;
45
46 if (barrier == NULL || count == 0)
47 {
48 return EINVAL;
49 }
50
51 if (NULL != (b = (pthread_barrier_t) calloc (1, sizeof (*b))))
52 {
53 b->pshared = (attr != NULL && *attr != NULL
54 ? (*attr)->pshared : PTHREAD_PROCESS_PRIVATE);
55
56 b->nCurrentBarrierHeight = b->nInitialBarrierHeight = count;
57 b->iStep = 0;
58
59 /*
60 * Two semaphores are used in the same way as two stepping
61 * stones might be used in crossing a stream. Once all
62 * threads are safely on one stone, the other stone can
63 * be moved ahead, and the threads can start moving to it.
64 * If some threads decide to eat their lunch before moving
65 * then the other threads have to wait.
66 */
67 if (0 == sem_init (&(b->semBarrierBreeched[0]), b->pshared, 0))
68 {
69 if (0 == sem_init (&(b->semBarrierBreeched[1]), b->pshared, 0))
70 {
71 *barrier = b;
72 return 0;
73 }
74 (void) sem_destroy (&(b->semBarrierBreeched[0]));
75 }
76 (void) free (b);
77 }
78
79 return ENOMEM;
80 }

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