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

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Revision 280 - (show annotations) (download)
Thu Dec 23 12:02:12 2010 UTC (9 years, 2 months ago) by william
File MIME type: text/plain
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re-commit (had local access denied errors when committing)
1 /*
2 * pthread_mutex_lock.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 INLINE int
40 pthread_mutex_lock (pthread_mutex_t * mutex)
41 {
42 int result = 0;
43 pthread_mutex_t mx;
44
45 /*
46 * Let the system deal with invalid pointers.
47 */
48 if (*mutex == NULL)
49 {
50 return EINVAL;
51 }
52
53 /*
54 * We do a quick check to see if we need to do more work
55 * to initialise a static mutex. We check
56 * again inside the guarded section of ptw32_mutex_check_need_init()
57 * to avoid race conditions.
58 */
59 if (ptw32_static_mutex_enable && (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER))
60 {
61 if ((result = ptw32_mutex_check_need_init (mutex)) != 0)
62 {
63 return (result);
64 }
65 }
66
67 mx = *mutex;
68
69 if (mx->kind == PTHREAD_MUTEX_NORMAL)
70 {
71 if (_InterlockedExchange( &mx->lock_idx, 1) != 0)
72 {
73 while (_InterlockedExchange( &mx->lock_idx, -1) != 0)
74 {
75 if (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
76 {
77 result = EINVAL;
78 break;
79 }
80 }
81 }
82 }
83 else
84 {
85 pthread_t self = pthread_self();
86
87 if (_InterlockedCompareExchange(&mx->lock_idx, 1, 0) == 0)
88 {
89 mx->recursive_count = 1;
90 mx->ownerThread = self;
91 }
92 else
93 {
94 if (pthread_equal (mx->ownerThread, self))
95 {
96 if (mx->kind == PTHREAD_MUTEX_RECURSIVE)
97 {
98 mx->recursive_count++;
99 }
100 else
101 {
102 result = EDEADLK;
103 }
104 }
105 else
106 {
107 while (_InterlockedExchange(&mx->lock_idx, -1) != 0)
108 {
109 if (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
110 {
111 result = EINVAL;
112 break;
113 }
114 }
115
116 if (0 == result)
117 {
118 mx->recursive_count = 1;
119 mx->ownerThread = self;
120 }
121 }
122 }
123 }
124
125 return (result);
126 }

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