Index: Source/WTF/wtf/ThreadSpecific.h |
diff --git a/Source/WTF/wtf/ThreadSpecific.h b/Source/WTF/wtf/ThreadSpecific.h |
deleted file mode 100644 |
index 4ebece055799ea170defae59f2f9a7e288d7d816..0000000000000000000000000000000000000000 |
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-/* |
- * Copyright (C) 2008 Apple Inc. All rights reserved. |
- * Copyright (C) 2009 Jian Li <jianli@chromium.org> |
- * Copyright (C) 2012 Patrick Gansterer <paroga@paroga.com> |
- * |
- * Redistribution and use in source and binary forms, with or without |
- * modification, are permitted provided that the following conditions |
- * are met: |
- * |
- * 1. Redistributions of source code must retain the above copyright |
- * notice, this list of conditions and the following disclaimer. |
- * 2. Redistributions in binary form must reproduce the above copyright |
- * notice, this list of conditions and the following disclaimer in the |
- * documentation and/or other materials provided with the distribution. |
- * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
- * its contributors may be used to endorse or promote products derived |
- * from this software without specific prior written permission. |
- * |
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
- */ |
- |
-/* Thread local storage is implemented by using either pthread API or Windows |
- * native API. There is subtle semantic discrepancy for the cleanup function |
- * implementation as noted below: |
- * @ In pthread implementation, the destructor function will be called |
- * repeatedly if there is still non-NULL value associated with the function. |
- * @ In Windows native implementation, the destructor function will be called |
- * only once. |
- * This semantic discrepancy does not impose any problem because nowhere in |
- * WebKit the repeated call bahavior is utilized. |
- */ |
- |
-#ifndef WTF_ThreadSpecific_h |
-#define WTF_ThreadSpecific_h |
- |
-#include <wtf/Noncopyable.h> |
-#include <wtf/StdLibExtras.h> |
- |
-#if USE(PTHREADS) |
-#include <pthread.h> |
-#elif OS(WINDOWS) |
-#include <windows.h> |
-#endif |
- |
-namespace WTF { |
- |
-#if OS(WINDOWS) |
-// ThreadSpecificThreadExit should be called each time when a thread is detached. |
-// This is done automatically for threads created with WTF::createThread. |
-void ThreadSpecificThreadExit(); |
-#endif |
- |
-template<typename T> class ThreadSpecific { |
- WTF_MAKE_NONCOPYABLE(ThreadSpecific); |
-public: |
- ThreadSpecific(); |
- bool isSet(); // Useful as a fast check to see if this thread has set this value. |
- T* operator->(); |
- operator T*(); |
- T& operator*(); |
- |
-private: |
-#if OS(WINDOWS) |
- friend void ThreadSpecificThreadExit(); |
-#endif |
- |
- // Not implemented. It's technically possible to destroy a thread specific key, but one would need |
- // to make sure that all values have been destroyed already (usually, that all threads that used it |
- // have exited). It's unlikely that any user of this call will be in that situation - and having |
- // a destructor defined can be confusing, given that it has such strong pre-requisites to work correctly. |
- ~ThreadSpecific(); |
- |
- T* get(); |
- void set(T*); |
- void static destroy(void* ptr); |
- |
- struct Data { |
- WTF_MAKE_NONCOPYABLE(Data); |
- public: |
- Data(T* value, ThreadSpecific<T>* owner) : value(value), owner(owner) {} |
- |
- T* value; |
- ThreadSpecific<T>* owner; |
-#if OS(WINDOWS) |
- void (*destructor)(void*); |
-#endif |
- }; |
- |
-#if USE(PTHREADS) |
- pthread_key_t m_key; |
-#elif OS(WINDOWS) |
- int m_index; |
-#endif |
-}; |
- |
-#if USE(PTHREADS) |
- |
-typedef pthread_key_t ThreadSpecificKey; |
- |
-inline void threadSpecificKeyCreate(ThreadSpecificKey* key, void (*destructor)(void *)) |
-{ |
- int error = pthread_key_create(key, destructor); |
- if (error) |
- CRASH(); |
-} |
- |
-inline void threadSpecificKeyDelete(ThreadSpecificKey key) |
-{ |
- int error = pthread_key_delete(key); |
- if (error) |
- CRASH(); |
-} |
- |
-inline void threadSpecificSet(ThreadSpecificKey key, void* value) |
-{ |
- pthread_setspecific(key, value); |
-} |
- |
-inline void* threadSpecificGet(ThreadSpecificKey key) |
-{ |
- return pthread_getspecific(key); |
-} |
- |
-template<typename T> |
-inline ThreadSpecific<T>::ThreadSpecific() |
-{ |
- int error = pthread_key_create(&m_key, destroy); |
- if (error) |
- CRASH(); |
-} |
- |
-template<typename T> |
-inline T* ThreadSpecific<T>::get() |
-{ |
- Data* data = static_cast<Data*>(pthread_getspecific(m_key)); |
- return data ? data->value : 0; |
-} |
- |
-template<typename T> |
-inline void ThreadSpecific<T>::set(T* ptr) |
-{ |
- ASSERT(!get()); |
- pthread_setspecific(m_key, new Data(ptr, this)); |
-} |
- |
-#elif OS(WINDOWS) |
- |
-// TLS_OUT_OF_INDEXES is not defined on WinCE. |
-#ifndef TLS_OUT_OF_INDEXES |
-#define TLS_OUT_OF_INDEXES 0xffffffff |
-#endif |
- |
-// The maximum number of TLS keys that can be created. For simplification, we assume that: |
-// 1) Once the instance of ThreadSpecific<> is created, it will not be destructed until the program dies. |
-// 2) We do not need to hold many instances of ThreadSpecific<> data. This fixed number should be far enough. |
-const int kMaxTlsKeySize = 256; |
- |
-WTF_EXPORT_PRIVATE long& tlsKeyCount(); |
-WTF_EXPORT_PRIVATE DWORD* tlsKeys(); |
- |
-class PlatformThreadSpecificKey; |
-typedef PlatformThreadSpecificKey* ThreadSpecificKey; |
- |
-void threadSpecificKeyCreate(ThreadSpecificKey*, void (*)(void *)); |
-void threadSpecificKeyDelete(ThreadSpecificKey); |
-void threadSpecificSet(ThreadSpecificKey, void*); |
-void* threadSpecificGet(ThreadSpecificKey); |
- |
-template<typename T> |
-inline ThreadSpecific<T>::ThreadSpecific() |
- : m_index(-1) |
-{ |
- DWORD tlsKey = TlsAlloc(); |
- if (tlsKey == TLS_OUT_OF_INDEXES) |
- CRASH(); |
- |
- m_index = InterlockedIncrement(&tlsKeyCount()) - 1; |
- if (m_index >= kMaxTlsKeySize) |
- CRASH(); |
- tlsKeys()[m_index] = tlsKey; |
-} |
- |
-template<typename T> |
-inline ThreadSpecific<T>::~ThreadSpecific() |
-{ |
- // Does not invoke destructor functions. They will be called from ThreadSpecificThreadExit when the thread is detached. |
- TlsFree(tlsKeys()[m_index]); |
-} |
- |
-template<typename T> |
-inline T* ThreadSpecific<T>::get() |
-{ |
- Data* data = static_cast<Data*>(TlsGetValue(tlsKeys()[m_index])); |
- return data ? data->value : 0; |
-} |
- |
-template<typename T> |
-inline void ThreadSpecific<T>::set(T* ptr) |
-{ |
- ASSERT(!get()); |
- Data* data = new Data(ptr, this); |
- data->destructor = &ThreadSpecific<T>::destroy; |
- TlsSetValue(tlsKeys()[m_index], data); |
-} |
- |
-#else |
-#error ThreadSpecific is not implemented for this platform. |
-#endif |
- |
-template<typename T> |
-inline void ThreadSpecific<T>::destroy(void* ptr) |
-{ |
- Data* data = static_cast<Data*>(ptr); |
- |
-#if USE(PTHREADS) |
- // We want get() to keep working while data destructor works, because it can be called indirectly by the destructor. |
- // Some pthreads implementations zero out the pointer before calling destroy(), so we temporarily reset it. |
- pthread_setspecific(data->owner->m_key, ptr); |
-#endif |
- |
- data->value->~T(); |
- fastFree(data->value); |
- |
-#if USE(PTHREADS) |
- pthread_setspecific(data->owner->m_key, 0); |
-#elif OS(WINDOWS) |
- TlsSetValue(tlsKeys()[data->owner->m_index], 0); |
-#else |
-#error ThreadSpecific is not implemented for this platform. |
-#endif |
- |
- delete data; |
-} |
- |
-template<typename T> |
-inline bool ThreadSpecific<T>::isSet() |
-{ |
- return !!get(); |
-} |
- |
-template<typename T> |
-inline ThreadSpecific<T>::operator T*() |
-{ |
- T* ptr = static_cast<T*>(get()); |
- if (!ptr) { |
- // Set up thread-specific value's memory pointer before invoking constructor, in case any function it calls |
- // needs to access the value, to avoid recursion. |
- ptr = static_cast<T*>(fastZeroedMalloc(sizeof(T))); |
- set(ptr); |
- new (NotNull, ptr) T; |
- } |
- return ptr; |
-} |
- |
-template<typename T> |
-inline T* ThreadSpecific<T>::operator->() |
-{ |
- return operator T*(); |
-} |
- |
-template<typename T> |
-inline T& ThreadSpecific<T>::operator*() |
-{ |
- return *operator T*(); |
-} |
- |
-} // namespace WTF |
- |
-#endif // WTF_ThreadSpecific_h |