1 /*
2 * Copyright (C) 2009 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32
33 #if USE(PTHREADS)
34
35 #include "ThreadIdentifierDataPthreads.h"
36
37 #include "Threading.h"
38
39 namespace WTF {
40
41 pthread_key_t ThreadIdentifierData::m_key;
42
43 void clearPthreadHandleForIdentifier(ThreadIdentifier);
44
~ThreadIdentifierData()45 ThreadIdentifierData::~ThreadIdentifierData()
46 {
47 clearPthreadHandleForIdentifier(m_identifier);
48 }
49
identifier()50 ThreadIdentifier ThreadIdentifierData::identifier()
51 {
52 initializeKeyOnce();
53 ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(pthread_getspecific(m_key));
54
55 return threadIdentifierData ? threadIdentifierData->m_identifier : 0;
56 }
57
initialize(ThreadIdentifier id)58 void ThreadIdentifierData::initialize(ThreadIdentifier id)
59 {
60 ASSERT(!identifier());
61
62 initializeKeyOnce();
63 pthread_setspecific(m_key, new ThreadIdentifierData(id));
64 }
65
destruct(void * data)66 void ThreadIdentifierData::destruct(void* data)
67 {
68 ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(data);
69 ASSERT(threadIdentifierData);
70
71 if (threadIdentifierData->m_isDestroyedOnce) {
72 delete threadIdentifierData;
73 return;
74 }
75
76 threadIdentifierData->m_isDestroyedOnce = true;
77 // Re-setting the value for key causes another destruct() call after all other thread-specific destructors were called.
78 pthread_setspecific(m_key, threadIdentifierData);
79 }
80
initializeKeyOnceHelper()81 void ThreadIdentifierData::initializeKeyOnceHelper()
82 {
83 if (pthread_key_create(&m_key, destruct))
84 CRASH();
85 }
86
initializeKeyOnce()87 void ThreadIdentifierData::initializeKeyOnce()
88 {
89 static pthread_once_t onceControl = PTHREAD_ONCE_INIT;
90 if (pthread_once(&onceControl, initializeKeyOnceHelper))
91 CRASH();
92 }
93
94 } // namespace WTF
95
96 #endif // USE(PTHREADS)
97
98