1 /*
2 * Copyright (C) 2009, 2011 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 "wtf/ThreadIdentifierDataPthreads.h"
36
37 #include "wtf/Assertions.h"
38 #include "wtf/WTF.h"
39
40 #if OS(ANDROID)
41 // PTHREAD_KEYS_MAX is not defined in bionic, so explicitly define it here.
42 #ifndef PTHREAD_KEYS_MAX
43 #define PTHREAD_KEYS_MAX 1024
44 #endif // PTHREAD_KEYS_MAX
45 #else
46 #include <limits.h>
47 #endif
48
49 namespace WTF {
50
51 pthread_key_t ThreadIdentifierData::m_key = PTHREAD_KEYS_MAX;
52
53 void threadDidExit(ThreadIdentifier);
54
~ThreadIdentifierData()55 ThreadIdentifierData::~ThreadIdentifierData()
56 {
57 threadDidExit(m_identifier);
58 }
59
initializeOnce()60 void ThreadIdentifierData::initializeOnce()
61 {
62 if (pthread_key_create(&m_key, destruct))
63 CRASH();
64 }
65
identifier()66 ThreadIdentifier ThreadIdentifierData::identifier()
67 {
68 ASSERT(m_key != PTHREAD_KEYS_MAX);
69 ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(pthread_getspecific(m_key));
70
71 return threadIdentifierData ? threadIdentifierData->m_identifier : 0;
72 }
73
initialize(ThreadIdentifier id)74 void ThreadIdentifierData::initialize(ThreadIdentifier id)
75 {
76 ASSERT(!identifier());
77 pthread_setspecific(m_key, new ThreadIdentifierData(id));
78 }
79
destruct(void * data)80 void ThreadIdentifierData::destruct(void* data)
81 {
82 if (isShutdown())
83 return;
84
85 ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(data);
86 ASSERT(threadIdentifierData);
87
88 if (threadIdentifierData->m_isDestroyedOnce) {
89 delete threadIdentifierData;
90 return;
91 }
92
93 threadIdentifierData->m_isDestroyedOnce = true;
94 // Re-setting the value for key causes another destruct() call after all other thread-specific destructors were called.
95 pthread_setspecific(m_key, threadIdentifierData);
96 }
97
98 } // namespace WTF
99
100 #endif // USE(PTHREADS)
101