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authorThe Android Open Source Project <initial-contribution@android.com>2008-10-21 07:00:00 -0700
committerThe Android Open Source Project <initial-contribution@android.com>2008-10-21 07:00:00 -0700
commit9364f22aed35e1a1e9d07c121510f80be3ab0502 (patch)
treed49911209b132da58d838efa852daf28d516df21 /JavaScriptCore/wtf/Threading.h
parent87eb0cb35bad8784770ebc807e6c982432e47107 (diff)
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Initial Contribution
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-/*
- * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
- * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.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.
- *
- *
- * Note: The implementations of InterlockedIncrement and InterlockedDecrement are based
- * on atomic_increment and atomic_exchange_and_add from the Boost C++ Library. The license
- * is virtually identical to the Apple license above but is included here for completeness.
- *
- * Boost Software License - Version 1.0 - August 17th, 2003
- *
- * Permission is hereby granted, free of charge, to any person or organization
- * obtaining a copy of the software and accompanying documentation covered by
- * this license (the "Software") to use, reproduce, display, distribute,
- * execute, and transmit the Software, and to prepare derivative works of the
- * Software, and to permit third-parties to whom the Software is furnished to
- * do so, all subject to the following:
- *
- * The copyright notices in the Software and this entire statement, including
- * the above license grant, this restriction and the following disclaimer,
- * must be included in all copies of the Software, in whole or in part, and
- * all derivative works of the Software, unless such copies or derivative
- * works are solely in the form of machine-executable object code generated by
- * a source language processor.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
- * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
- * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- */
-
-#ifndef Threading_h
-#define Threading_h
-
-#include <wtf/Assertions.h>
-#include <wtf/Locker.h>
-#include <wtf/Noncopyable.h>
-
-#if PLATFORM(WIN_OS)
-#include <windows.h>
-#elif PLATFORM(DARWIN)
-#include <libkern/OSAtomic.h>
-#elif COMPILER(GCC)
-#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 2))
-#include <ext/atomicity.h>
-#else
-#include <bits/atomicity.h>
-#endif
-#endif
-
-#if USE(PTHREADS)
-#include <pthread.h>
-#endif
-
-#if PLATFORM(GTK)
-typedef struct _GMutex GMutex;
-typedef struct _GCond GCond;
-#endif
-
-#if PLATFORM(QT)
-class QMutex;
-class QWaitCondition;
-#endif
-
-#include <stdint.h>
-
-namespace WTF {
-
-typedef uint32_t ThreadIdentifier;
-typedef void* (*ThreadFunction)(void* argument);
-
-// Returns 0 if thread creation failed
-ThreadIdentifier createThread(ThreadFunction, void*);
-ThreadIdentifier currentThread();
-int waitForThreadCompletion(ThreadIdentifier, void**);
-void detachThread(ThreadIdentifier);
-
-#if USE(PTHREADS)
-typedef pthread_mutex_t PlatformMutex;
-typedef pthread_cond_t PlatformCondition;
-#elif PLATFORM(GTK)
-typedef GMutex* PlatformMutex;
-typedef GCond* PlatformCondition;
-#elif PLATFORM(QT)
-typedef QMutex* PlatformMutex;
-typedef QWaitCondition* PlatformCondition;
-#elif PLATFORM(WIN_OS)
-struct PlatformMutex {
- CRITICAL_SECTION m_internalMutex;
- size_t m_recursionCount;
-};
-struct PlatformCondition {
- size_t m_timedOut;
- size_t m_blocked;
- size_t m_waitingForRemoval;
- HANDLE m_gate;
- HANDLE m_queue;
- HANDLE m_mutex;
-};
-#else
-typedef void* PlatformMutex;
-typedef void* PlatformCondition;
-#endif
-
-class Mutex : Noncopyable {
-public:
- Mutex();
- ~Mutex();
-
- void lock();
- bool tryLock();
- void unlock();
-
-public:
- PlatformMutex& impl() { return m_mutex; }
-private:
- PlatformMutex m_mutex;
-};
-
-typedef Locker<Mutex> MutexLocker;
-
-class ThreadCondition : Noncopyable {
-public:
- ThreadCondition();
- ~ThreadCondition();
-
- void wait(Mutex& mutex);
- void signal();
- void broadcast();
-
-private:
- PlatformCondition m_condition;
-};
-
-#if PLATFORM(WIN_OS) && !COMPILER(MSVC7)
-#define WTF_USE_LOCKFREE_THREADSAFESHARED 1
-
-inline void atomicIncrement(int volatile* addend) { InterlockedIncrement(reinterpret_cast<long volatile*>(addend)); }
-inline int atomicDecrement(int volatile* addend) { return InterlockedDecrement(reinterpret_cast<long volatile*>(addend)); }
-
-#elif PLATFORM(DARWIN)
-#define WTF_USE_LOCKFREE_THREADSAFESHARED 1
-
-inline void atomicIncrement(int volatile* addend) { OSAtomicIncrement32Barrier(const_cast<int*>(addend)); }
-inline int atomicDecrement(int volatile* addend) { return OSAtomicDecrement32Barrier(const_cast<int*>(addend)); }
-
-#elif COMPILER(GCC)
-#define WTF_USE_LOCKFREE_THREADSAFESHARED 1
-
-inline void atomicIncrement(int volatile* addend) { __gnu_cxx::__atomic_add(addend, 1); }
-inline int atomicDecrement(int volatile* addend) { return __gnu_cxx::__exchange_and_add(addend, -1) - 1; }
-
-#endif
-
-template<class T> class ThreadSafeShared : Noncopyable {
-public:
- ThreadSafeShared()
- : m_refCount(0)
- {
- }
-
- void ref()
- {
-#if USE(LOCKFREE_THREADSAFESHARED)
- atomicIncrement(&m_refCount);
-#else
- MutexLocker locker(m_mutex);
- ++m_refCount;
-#endif
- }
-
- void deref()
- {
-#if USE(LOCKFREE_THREADSAFESHARED)
- if (atomicDecrement(&m_refCount) <= 0)
-#else
- {
- MutexLocker locker(m_mutex);
- --m_refCount;
- }
- if (m_refCount <= 0)
-#endif
- delete static_cast<T*>(this);
- }
-
- bool hasOneRef()
- {
- return refCount() == 1;
- }
-
- int refCount() const
- {
-#if !USE(LOCKFREE_THREADSAFESHARED)
- MutexLocker locker(m_mutex);
-#endif
- return static_cast<int const volatile &>(m_refCount);
- }
-
-private:
- int m_refCount;
-#if !USE(LOCKFREE_THREADSAFESHARED)
- mutable Mutex m_mutex;
-#endif
-};
-
-void initializeThreading();
-
-#if !PLATFORM(GTK)
-inline void initializeThreading()
-{
-}
-#endif
-
-} // namespace WTF
-
-using WTF::Mutex;
-using WTF::MutexLocker;
-using WTF::ThreadCondition;
-using WTF::ThreadIdentifier;
-using WTF::ThreadSafeShared;
-
-using WTF::createThread;
-using WTF::currentThread;
-using WTF::detachThread;
-using WTF::initializeThreading;
-using WTF::waitForThreadCompletion;
-
-#endif // Threading_h