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

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Revision 10 - (show annotations) (download)
Mon Sep 6 11:40:06 2010 UTC (9 years, 5 months ago) by william
File MIME type: text/plain
File size: 3729 byte(s)
exported r3113 from ./upstream/trunk
1 /*
2 * pthread_rwlock_timedwrlock.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 int
40 pthread_rwlock_timedwrlock (pthread_rwlock_t * rwlock,
41 const struct timespec *abstime)
42 {
43 int result;
44 pthread_rwlock_t rwl;
45
46 if (rwlock == NULL || *rwlock == NULL)
47 {
48 return EINVAL;
49 }
50
51 /*
52 * We do a quick check to see if we need to do more work
53 * to initialise a static rwlock. We check
54 * again inside the guarded section of ptw32_rwlock_check_need_init()
55 * to avoid race conditions.
56 */
57 if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)
58 {
59 result = ptw32_rwlock_check_need_init (rwlock);
60
61 if (result != 0 && result != EBUSY)
62 {
63 return result;
64 }
65 }
66
67 rwl = *rwlock;
68
69 if (rwl->nMagic != PTW32_RWLOCK_MAGIC)
70 {
71 return EINVAL;
72 }
73
74 if ((result =
75 pthread_mutex_timedlock (&(rwl->mtxExclusiveAccess), abstime)) != 0)
76 {
77 return result;
78 }
79
80 if ((result =
81 pthread_mutex_timedlock (&(rwl->mtxSharedAccessCompleted),
82 abstime)) != 0)
83 {
84 (void) pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
85 return result;
86 }
87
88 if (rwl->nExclusiveAccessCount == 0)
89 {
90 if (rwl->nCompletedSharedAccessCount > 0)
91 {
92 rwl->nSharedAccessCount -= rwl->nCompletedSharedAccessCount;
93 rwl->nCompletedSharedAccessCount = 0;
94 }
95
96 if (rwl->nSharedAccessCount > 0)
97 {
98 rwl->nCompletedSharedAccessCount = -rwl->nSharedAccessCount;
99
100 /*
101 * This routine may be a cancelation point
102 * according to POSIX 1003.1j section 18.1.2.
103 */
104 #ifdef _MSC_VER
105 #pragma inline_depth(0)
106 #endif
107 pthread_cleanup_push (ptw32_rwlock_cancelwrwait, (void *) rwl);
108
109 do
110 {
111 result =
112 pthread_cond_timedwait (&(rwl->cndSharedAccessCompleted),
113 &(rwl->mtxSharedAccessCompleted),
114 abstime);
115 }
116 while (result == 0 && rwl->nCompletedSharedAccessCount < 0);
117
118 pthread_cleanup_pop ((result != 0) ? 1 : 0);
119 #ifdef _MSC_VER
120 #pragma inline_depth()
121 #endif
122
123 if (result == 0)
124 {
125 rwl->nSharedAccessCount = 0;
126 }
127 }
128 }
129
130 if (result == 0)
131 {
132 rwl->nExclusiveAccessCount++;
133 }
134
135 return result;
136 }

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