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

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Revision 31 - (hide annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years ago) by william
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committing r3113 initial commit again...
1 william 31 /*
2     * pthread_rwlock_destroy.c
3     *
4     * Description:
5     * This translation unit implements read/write 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     int
40     pthread_rwlock_destroy (pthread_rwlock_t * rwlock)
41     {
42     pthread_rwlock_t rwl;
43     int result = 0, result1 = 0, result2 = 0;
44    
45     if (rwlock == NULL || *rwlock == NULL)
46     {
47     return EINVAL;
48     }
49    
50     if (*rwlock != PTHREAD_RWLOCK_INITIALIZER)
51     {
52     rwl = *rwlock;
53    
54     if (rwl->nMagic != PTW32_RWLOCK_MAGIC)
55     {
56     return EINVAL;
57     }
58    
59     if ((result = pthread_mutex_lock (&(rwl->mtxExclusiveAccess))) != 0)
60     {
61     return result;
62     }
63    
64     if ((result =
65     pthread_mutex_lock (&(rwl->mtxSharedAccessCompleted))) != 0)
66     {
67     (void) pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
68     return result;
69     }
70    
71     /*
72     * Check whether any threads own/wait for the lock (wait for ex.access);
73     * report "BUSY" if so.
74     */
75     if (rwl->nExclusiveAccessCount > 0
76     || rwl->nSharedAccessCount > rwl->nCompletedSharedAccessCount)
77     {
78     result = pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted));
79     result1 = pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
80     result2 = EBUSY;
81     }
82     else
83     {
84     rwl->nMagic = 0;
85    
86     if ((result =
87     pthread_mutex_unlock (&(rwl->mtxSharedAccessCompleted))) != 0)
88     {
89     pthread_mutex_unlock (&rwl->mtxExclusiveAccess);
90     return result;
91     }
92    
93     if ((result =
94     pthread_mutex_unlock (&(rwl->mtxExclusiveAccess))) != 0)
95     {
96     return result;
97     }
98    
99     *rwlock = NULL; /* Invalidate rwlock before anything else */
100     result = pthread_cond_destroy (&(rwl->cndSharedAccessCompleted));
101     result1 = pthread_mutex_destroy (&(rwl->mtxSharedAccessCompleted));
102     result2 = pthread_mutex_destroy (&(rwl->mtxExclusiveAccess));
103     (void) free (rwl);
104     }
105     }
106     else
107     {
108     /*
109     * See notes in ptw32_rwlock_check_need_init() above also.
110     */
111     EnterCriticalSection (&ptw32_rwlock_test_init_lock);
112    
113     /*
114     * Check again.
115     */
116     if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)
117     {
118     /*
119     * This is all we need to do to destroy a statically
120     * initialised rwlock that has not yet been used (initialised).
121     * If we get to here, another thread
122     * waiting to initialise this rwlock will get an EINVAL.
123     */
124     *rwlock = NULL;
125     }
126     else
127     {
128     /*
129     * The rwlock has been initialised while we were waiting
130     * so assume it's in use.
131     */
132     result = EBUSY;
133     }
134    
135     LeaveCriticalSection (&ptw32_rwlock_test_init_lock);
136     }
137    
138     return ((result != 0) ? result : ((result1 != 0) ? result1 : result2));
139     }

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