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