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

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Revision 280 - (show annotations) (download)
Thu Dec 23 12:02:12 2010 UTC (9 years, 7 months ago) by william
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re-commit (had local access denied errors when committing)
1 /*
2 * pthread_spin_destroy.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_destroy (pthread_spinlock_t * lock)
42 {
43 register pthread_spinlock_t s;
44 int result = 0;
45
46 if (lock == NULL || *lock == NULL)
47 {
48 return EINVAL;
49 }
50
51 if ((s = *lock) != PTHREAD_SPINLOCK_INITIALIZER)
52 {
53 if (s->interlock == PTW32_SPIN_USE_MUTEX)
54 {
55 result = pthread_mutex_destroy (&(s->u.mutex));
56 }
57 else if (PTW32_SPIN_UNLOCKED !=
58 _InterlockedCompareExchange(&(s->interlock), PTW32_OBJECT_INVALID, PTW32_SPIN_UNLOCKED))
59 {
60 result = EINVAL;
61 }
62
63 if (0 == result)
64 {
65 /*
66 * We are relying on the application to ensure that all other threads
67 * have finished with the spinlock before destroying it.
68 */
69 *lock = NULL;
70 (void) free (s);
71 }
72 }
73 else
74 {
75 /*
76 * See notes in ptw32_spinlock_check_need_init() above also.
77 */
78 EnterCriticalSection (&ptw32_spinlock_test_init_lock);
79
80 /*
81 * Check again.
82 */
83 if (*lock == PTHREAD_SPINLOCK_INITIALIZER)
84 {
85 /*
86 * This is all we need to do to destroy a statically
87 * initialised spinlock that has not yet been used (initialised).
88 * If we get to here, another thread
89 * waiting to initialise this mutex will get an EINVAL.
90 */
91 *lock = NULL;
92 }
93 else
94 {
95 /*
96 * The spinlock has been initialised while we were waiting
97 * so assume it's in use.
98 */
99 result = EBUSY;
100 }
101
102 LeaveCriticalSection (&ptw32_spinlock_test_init_lock);
103 }
104
105 return (result);
106 }

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