/[pcsx2_0.9.7]/trunk/3rdparty/w32pthreads/pthread_mutex_trylock.c
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Contents of /trunk/3rdparty/w32pthreads/pthread_mutex_trylock.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: 2742 byte(s)
exported r3113 from ./upstream/trunk
1 /*
2 * pthread_mutex_trylock.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_trylock (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 /*
51 * We do a quick check to see if we need to do more work
52 * to initialise a static mutex. We check
53 * again inside the guarded section of ptw32_mutex_check_need_init()
54 * to avoid race conditions.
55 */
56 if (ptw32_static_mutex_enable && (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER))
57 {
58 if ((result = ptw32_mutex_check_need_init (mutex)) != 0)
59 {
60 return (result);
61 }
62 }
63
64 mx = *mutex;
65
66 if (0 == (LONG) PTW32_INTERLOCKED_COMPARE_EXCHANGE (
67 (PTW32_INTERLOCKED_LPLONG) &mx->lock_idx,
68 (PTW32_INTERLOCKED_LONG) 1,
69 (PTW32_INTERLOCKED_LONG) 0))
70 {
71 if (mx->kind != PTHREAD_MUTEX_NORMAL)
72 {
73 mx->recursive_count = 1;
74 mx->ownerThread = pthread_self ();
75 }
76 }
77 else
78 {
79 if (mx->kind == PTHREAD_MUTEX_RECURSIVE &&
80 pthread_equal (mx->ownerThread, pthread_self ()))
81 {
82 mx->recursive_count++;
83 }
84 else
85 {
86 result = EBUSY;
87 }
88 }
89
90 return (result);
91 }

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