/[pcsx2_0.9.7]/trunk/3rdparty/w32pthreads/ptw32_spinlock_check_need_init.c
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Contents of /trunk/3rdparty/w32pthreads/ptw32_spinlock_check_need_init.c

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Revision 31 - (show annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (9 years, 11 months ago) by william
File MIME type: text/plain
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committing r3113 initial commit again...
1 /*
2 * ptw32_spinlock_check_need_init.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 INLINE int
41 ptw32_spinlock_check_need_init (pthread_spinlock_t * lock)
42 {
43 int result = 0;
44
45 /*
46 * The following guarded test is specifically for statically
47 * initialised spinlocks (via PTHREAD_SPINLOCK_INITIALIZER).
48 *
49 * Note that by not providing this synchronisation we risk
50 * introducing race conditions into applications which are
51 * correctly written.
52 */
53 EnterCriticalSection (&ptw32_spinlock_test_init_lock);
54
55 /*
56 * We got here possibly under race
57 * conditions. Check again inside the critical section
58 * and only initialise if the spinlock is valid (not been destroyed).
59 * If a static spinlock has been destroyed, the application can
60 * re-initialise it only by calling pthread_spin_init()
61 * explicitly.
62 */
63 if (*lock == PTHREAD_SPINLOCK_INITIALIZER)
64 {
65 result = pthread_spin_init (lock, PTHREAD_PROCESS_PRIVATE);
66 }
67 else if (*lock == NULL)
68 {
69 /*
70 * The spinlock has been destroyed while we were waiting to
71 * initialise it, so the operation that caused the
72 * auto-initialisation should fail.
73 */
74 result = EINVAL;
75 }
76
77 LeaveCriticalSection (&ptw32_spinlock_test_init_lock);
78
79 return (result);
80 }

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