/[pcsx2_0.9.7]/trunk/3rdparty/w32pthreads/pthread_rwlock_unlock.c
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Contents of /trunk/3rdparty/w32pthreads/pthread_rwlock_unlock.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
File MIME type: text/plain
File size: 2571 byte(s)
committing r3113 initial commit again...
1 /*
2 * pthread_rwlock_unlock.c
3 *
4 * Description:
5 * This translation unit implements read/write lock 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_rwlock_unlock (pthread_rwlock_t * rwlock)
42 {
43 int result, result1;
44 pthread_rwlock_t rwl;
45
46 if (rwlock == NULL || *rwlock == NULL)
47 {
48 return (EINVAL);
49 }
50
51 if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)
52 {
53 /*
54 * Assume any race condition here is harmless.
55 */
56 return 0;
57 }
58
59 rwl = *rwlock;
60
61 if (rwl->nMagic != PTW32_RWLOCK_MAGIC)
62 {
63 return EINVAL;
64 }
65
66 if (rwl->nExclusiveAccessCount == 0)
67 {
68 if ((result =
69 pthread_mutex_lock (&(rwl->mtxSharedAccessCompleted))) != 0)
70 {
71 return result;
72 }
73
74 if (++rwl->nCompletedSharedAccessCount == 0)
75 {
76 result = pthread_cond_signal (&(rwl->cndSharedAccessCompleted));
77 }
78
79 result1 = pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted));
80 }
81 else
82 {
83 rwl->nExclusiveAccessCount--;
84
85 result = pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted));
86 result1 = pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
87
88 }
89
90 return ((result != 0) ? result : result1);
91 }

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