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 "ThreadIdentifierDataPthreads.h"
36
37#include "Threading.h"
38
39#if OS(HURD)
40// PTHREAD_KEYS_MAX is not defined in bionic nor in Hurd, so explicitly define it here.
41#define PTHREAD_KEYS_MAX 1024
42#else
43#include <limits.h>
44#endif
45
46namespace WTF {
47
48pthread_key_t ThreadIdentifierData::m_key = PTHREAD_KEYS_MAX;
49
50void threadDidExit(ThreadIdentifier);
51
52ThreadIdentifierData::~ThreadIdentifierData()
53{
54    threadDidExit(m_identifier);
55}
56
57void ThreadIdentifierData::initializeOnce()
58{
59    if (pthread_key_create(&m_key, destruct))
60        CRASH();
61}
62
63ThreadIdentifier ThreadIdentifierData::identifier()
64{
65    ASSERT(m_key != PTHREAD_KEYS_MAX);
66    ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(pthread_getspecific(m_key));
67
68    return threadIdentifierData ? threadIdentifierData->m_identifier : 0;
69}
70
71void ThreadIdentifierData::initialize(ThreadIdentifier id)
72{
73    ASSERT(!identifier());
74    pthread_setspecific(m_key, new ThreadIdentifierData(id));
75}
76
77void ThreadIdentifierData::destruct(void* data)
78{
79    ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(data);
80    ASSERT(threadIdentifierData);
81
82    if (threadIdentifierData->m_isDestroyedOnce) {
83        delete threadIdentifierData;
84        return;
85    }
86
87    threadIdentifierData->m_isDestroyedOnce = true;
88    // Re-setting the value for key causes another destruct() call after all other thread-specific destructors were called.
89    pthread_setspecific(m_key, threadIdentifierData);
90}
91
92} // namespace WTF
93
94#endif // USE(PTHREADS)
95