1 /* 2 * Copyright (C) 2009 Jian Li <jianli (at) chromium.org> 3 * Copyright (C) 2012 Patrick Gansterer <paroga (at) paroga.com> 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public License 16 * along with this library; see the file COPYING.LIB. If not, write to 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 * 20 */ 21 22 #include "config.h" 23 #include "ThreadSpecific.h" 24 25 #if OS(WINDOWS) 26 27 #include "StdLibExtras.h" 28 #include "ThreadingPrimitives.h" 29 #include "wtf/DoublyLinkedList.h" 30 31 namespace WTF { 32 33 static DoublyLinkedList<PlatformThreadSpecificKey>& destructorsList() 34 { 35 DEFINE_STATIC_LOCAL(DoublyLinkedList<PlatformThreadSpecificKey>, staticList, ()); 36 return staticList; 37 } 38 39 static Mutex& destructorsMutex() 40 { 41 DEFINE_STATIC_LOCAL(Mutex, staticMutex, ()); 42 return staticMutex; 43 } 44 45 class PlatformThreadSpecificKey : public DoublyLinkedListNode<PlatformThreadSpecificKey> { 46 public: 47 friend class DoublyLinkedListNode<PlatformThreadSpecificKey>; 48 49 PlatformThreadSpecificKey(void (*destructor)(void *)) 50 : m_destructor(destructor) 51 { 52 m_tlsKey = TlsAlloc(); 53 if (m_tlsKey == TLS_OUT_OF_INDEXES) 54 CRASH(); 55 } 56 57 ~PlatformThreadSpecificKey() 58 { 59 TlsFree(m_tlsKey); 60 } 61 62 void setValue(void* data) { TlsSetValue(m_tlsKey, data); } 63 void* value() { return TlsGetValue(m_tlsKey); } 64 65 void callDestructor() 66 { 67 if (void* data = value()) 68 m_destructor(data); 69 } 70 71 private: 72 void (*m_destructor)(void *); 73 DWORD m_tlsKey; 74 PlatformThreadSpecificKey* m_prev; 75 PlatformThreadSpecificKey* m_next; 76 }; 77 78 long& tlsKeyCount() 79 { 80 static long count; 81 return count; 82 } 83 84 DWORD* tlsKeys() 85 { 86 static DWORD keys[kMaxTlsKeySize]; 87 return keys; 88 } 89 90 void threadSpecificKeyCreate(ThreadSpecificKey* key, void (*destructor)(void *)) 91 { 92 *key = new PlatformThreadSpecificKey(destructor); 93 94 MutexLocker locker(destructorsMutex()); 95 destructorsList().push(*key); 96 } 97 98 void threadSpecificKeyDelete(ThreadSpecificKey key) 99 { 100 MutexLocker locker(destructorsMutex()); 101 destructorsList().remove(key); 102 delete key; 103 } 104 105 void threadSpecificSet(ThreadSpecificKey key, void* data) 106 { 107 key->setValue(data); 108 } 109 110 void* threadSpecificGet(ThreadSpecificKey key) 111 { 112 return key->value(); 113 } 114 115 void ThreadSpecificThreadExit() 116 { 117 for (long i = 0; i < tlsKeyCount(); i++) { 118 // The layout of ThreadSpecific<T>::Data does not depend on T. So we are safe to do the static cast to ThreadSpecific<int> in order to access its data member. 119 ThreadSpecific<int>::Data* data = static_cast<ThreadSpecific<int>::Data*>(TlsGetValue(tlsKeys()[i])); 120 if (data) 121 data->destructor(data); 122 } 123 124 MutexLocker locker(destructorsMutex()); 125 PlatformThreadSpecificKey* key = destructorsList().head(); 126 while (key) { 127 PlatformThreadSpecificKey* nextKey = key->next(); 128 key->callDestructor(); 129 key = nextKey; 130 } 131 } 132 133 } // namespace WTF 134 135 #endif // OS(WINDOWS) 136