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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 #ifndef ThreadIdentifierDataPthreads_h | |
32 #define ThreadIdentifierDataPthreads_h | |
33 | |
34 #include <wtf/Threading.h> | |
35 | |
36 namespace WTF { | |
37 | |
38 // Holds ThreadIdentifier in the thread-specific storage and employs pthreads-sp
ecific 2-pass destruction to reliably remove | |
39 // ThreadIdentifier from threadMap. It assumes regular ThreadSpecific types don'
t use multiple-pass destruction. | |
40 class ThreadIdentifierData { | |
41 WTF_MAKE_NONCOPYABLE(ThreadIdentifierData); | |
42 public: | |
43 ~ThreadIdentifierData(); | |
44 | |
45 // One time initialization for this class as a whole. | |
46 // This method must be called before initialize() and it is not thread-safe. | |
47 static void initializeOnce(); | |
48 | |
49 // Creates and puts an instance of ThreadIdentifierData into thread-specific
storage. | |
50 static void initialize(ThreadIdentifier identifier); | |
51 | |
52 // Returns 0 if thread-specific storage was not initialized. | |
53 static ThreadIdentifier identifier(); | |
54 | |
55 private: | |
56 ThreadIdentifierData(ThreadIdentifier identifier) | |
57 : m_identifier(identifier) | |
58 , m_isDestroyedOnce(false) | |
59 { | |
60 } | |
61 | |
62 // This thread-specific destructor is called 2 times when thread terminates: | |
63 // - first, when all the other thread-specific destructors are called, it si
mply remembers it was 'destroyed once' | |
64 // and re-sets itself into the thread-specific slot to make Pthreads to call
it again later. | |
65 // - second, after all thread-specific destructors were invoked, it gets cal
led again - this time, we remove the | |
66 // ThreadIdentifier from the threadMap, completing the cleanup. | |
67 static void destruct(void* data); | |
68 | |
69 ThreadIdentifier m_identifier; | |
70 bool m_isDestroyedOnce; | |
71 static pthread_key_t m_key; | |
72 }; | |
73 | |
74 } // namespace WTF | |
75 | |
76 #endif // ThreadIdentifierDataPthreads_h | |
77 | |
78 | |
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