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

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Revision 280 - (show annotations) (download)
Thu Dec 23 12:02:12 2010 UTC (9 years, 1 month ago) by william
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re-commit (had local access denied errors when committing)
1 /*
2 * pthread_spin_unlock.c
3 *
4 * Description:
5 * This translation unit implements spin 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_spin_unlock (pthread_spinlock_t * lock)
42 {
43 register pthread_spinlock_t s;
44
45 if (NULL == lock || NULL == *lock)
46 {
47 return (EINVAL);
48 }
49
50 s = *lock;
51
52 if (s == PTHREAD_SPINLOCK_INITIALIZER)
53 {
54 return EPERM;
55 }
56
57 switch ((long)
58 _InterlockedCompareExchange (&(s->interlock), PTW32_SPIN_UNLOCKED, PTW32_SPIN_LOCKED))
59 {
60 case PTW32_SPIN_LOCKED:
61 return 0;
62 case PTW32_SPIN_UNLOCKED:
63 return EPERM;
64 case PTW32_SPIN_USE_MUTEX:
65 return pthread_mutex_unlock (&(s->u.mutex));
66 }
67
68 return EINVAL;
69 }

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