/[pcsx2_0.9.7]/trunk/3rdparty/w32pthreads/pthread_mutex_unlock.c
ViewVC logotype

Contents of /trunk/3rdparty/w32pthreads/pthread_mutex_unlock.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 280 - (show annotations) (download)
Thu Dec 23 12:02:12 2010 UTC (9 years, 7 months ago) by william
File MIME type: text/plain
File size: 2924 byte(s)
re-commit (had local access denied errors when committing)
1 /*
2 * pthread_mutex_unlock.c
3 *
4 * Description:
5 * This translation unit implements mutual exclusion (mutex) 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 INLINE int
41 pthread_mutex_unlock (pthread_mutex_t * mutex)
42 {
43 int result = 0;
44 pthread_mutex_t mx;
45
46 /*
47 * Let the system deal with invalid pointers.
48 */
49
50 mx = *mutex;
51
52 /*
53 * If the thread calling us holds the mutex then there is no
54 * race condition. If another thread holds the
55 * lock then we shouldn't be in here.
56 */
57 if (!ptw32_static_mutex_enable || (mx < PTHREAD_ERRORCHECK_MUTEX_INITIALIZER))
58 {
59 if (mx->kind == PTHREAD_MUTEX_NORMAL)
60 {
61 LONG idx;
62
63 idx = _InterlockedExchange (&mx->lock_idx, 0);
64 if (idx != 0)
65 {
66 if (idx < 0)
67 {
68 /*
69 * Someone may be waiting on that mutex.
70 */
71 if (SetEvent (mx->event) == 0)
72 {
73 result = EINVAL;
74 }
75 }
76 }
77 else
78 {
79 /*
80 * Was not locked (so can't be owned by us).
81 */
82 result = EPERM;
83 }
84 }
85 else
86 {
87 if (pthread_equal (mx->ownerThread, pthread_self ()))
88 {
89 if (mx->kind != PTHREAD_MUTEX_RECURSIVE
90 || 0 == --mx->recursive_count)
91 {
92 mx->ownerThread.p = NULL;
93
94 if (_InterlockedExchange (&mx->lock_idx, 0) < 0)
95 {
96 /* Someone may be waiting on that mutex */
97 if (SetEvent (mx->event) == 0)
98 {
99 result = EINVAL;
100 }
101 }
102 }
103 }
104 else
105 {
106 result = EPERM;
107 }
108 }
109 }
110 else
111 {
112 result = EINVAL;
113 }
114
115 return (result);
116 }

  ViewVC Help
Powered by ViewVC 1.1.22