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

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Revision 280 - (hide annotations) (download)
Thu Dec 23 12:02:12 2010 UTC (9 years, 1 month ago) by william
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1 william 31 /*
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 william 280 else if (PTW32_SPIN_UNLOCKED !=
58     _InterlockedCompareExchange(&(s->interlock), PTW32_OBJECT_INVALID, PTW32_SPIN_UNLOCKED))
59 william 31 {
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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