/[pcsx2_0.9.7]/trunk/3rdparty/w32pthreads/pthread_key_delete.c
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Contents of /trunk/3rdparty/w32pthreads/pthread_key_delete.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
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committing r3113 initial commit again...
1 /*
2 * pthread_key_delete.c
3 *
4 * Description:
5 * POSIX thread functions which implement thread-specific data (TSD).
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_key_delete (pthread_key_t key)
42 /*
43 * ------------------------------------------------------
44 * DOCPUBLIC
45 * This function deletes a thread-specific data key. This
46 * does not change the value of the thread specific data key
47 * for any thread and does not run the key's destructor
48 * in any thread so it should be used with caution.
49 *
50 * PARAMETERS
51 * key
52 * pointer to an instance of pthread_key_t
53 *
54 *
55 * DESCRIPTION
56 * This function deletes a thread-specific data key. This
57 * does not change the value of the thread specific data key
58 * for any thread and does not run the key's destructor
59 * in any thread so it should be used with caution.
60 *
61 * RESULTS
62 * 0 successfully deleted the key,
63 * EINVAL key is invalid,
64 *
65 * ------------------------------------------------------
66 */
67 {
68 int result = 0;
69
70 if (key != NULL)
71 {
72 if (key->threads != NULL &&
73 key->destructor != NULL &&
74 pthread_mutex_lock (&(key->keyLock)) == 0)
75 {
76 ThreadKeyAssoc *assoc;
77 /*
78 * Run through all Thread<-->Key associations
79 * for this key.
80 *
81 * While we hold at least one of the locks guarding
82 * the assoc, we know that the assoc pointed to by
83 * key->threads is valid.
84 */
85 while ((assoc = (ThreadKeyAssoc *) key->threads) != NULL)
86 {
87 ptw32_thread_t * thread = assoc->thread;
88
89 if (assoc == NULL)
90 {
91 /* Finished */
92 break;
93 }
94
95 if (pthread_mutex_lock (&(thread->threadLock)) == 0)
96 {
97 /*
98 * Since we are starting at the head of the key's threads
99 * chain, this will also point key->threads at the next assoc.
100 * While we hold key->keyLock, no other thread can insert
101 * a new assoc via pthread_setspecific.
102 */
103 ptw32_tkAssocDestroy (assoc);
104 (void) pthread_mutex_unlock (&(thread->threadLock));
105 }
106 else
107 {
108 /* Thread or lock is no longer valid? */
109 ptw32_tkAssocDestroy (assoc);
110 }
111 }
112 pthread_mutex_unlock (&(key->keyLock));
113 }
114
115 TlsFree (key->key);
116 if (key->destructor != NULL)
117 {
118 /* A thread could be holding the keyLock */
119 while (EBUSY == pthread_mutex_destroy (&(key->keyLock)))
120 {
121 Sleep(1); // Ugly.
122 }
123 }
124
125 #if defined( _DEBUG )
126 memset ((char *) key, 0, sizeof (*key));
127 #endif
128 free (key);
129 }
130
131 return (result);
132 }

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