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/*
* Copyright (C) 2007, 2008, 2010 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.
*
*/
#ifndef ThreadingPrimitives_h
#define ThreadingPrimitives_h
#include "Platform.h"
#include <wtf/Assertions.h>
#include <wtf/FastAllocBase.h>
#include <wtf/Locker.h>
#include <wtf/Noncopyable.h>
#if OS(WINDOWS)
#include <windows.h>
#endif
#if USE(PTHREADS)
#include <pthread.h>
#elif PLATFORM(GTK)
#include "GOwnPtr.h"
#endif
#if PLATFORM(QT)
#include <qglobal.h>
QT_BEGIN_NAMESPACE
class QMutex;
class QWaitCondition;
QT_END_NAMESPACE
#endif
namespace WTF {
#if USE(PTHREADS)
typedef pthread_mutex_t PlatformMutex;
#if HAVE(PTHREAD_RWLOCK)
typedef pthread_rwlock_t PlatformReadWriteLock;
#else
typedef void* PlatformReadWriteLock;
#endif
typedef pthread_cond_t PlatformCondition;
#elif PLATFORM(GTK)
typedef GOwnPtr<GMutex> PlatformMutex;
typedef void* PlatformReadWriteLock; // FIXME: Implement.
typedef GOwnPtr<GCond> PlatformCondition;
#elif PLATFORM(QT)
typedef QT_PREPEND_NAMESPACE(QMutex)* PlatformMutex;
typedef void* PlatformReadWriteLock; // FIXME: Implement.
typedef QT_PREPEND_NAMESPACE(QWaitCondition)* PlatformCondition;
#elif OS(WINDOWS)
struct PlatformMutex {
CRITICAL_SECTION m_internalMutex;
size_t m_recursionCount;
};
typedef void* PlatformReadWriteLock; // FIXME: Implement.
struct PlatformCondition {
size_t m_waitersGone;
size_t m_waitersBlocked;
size_t m_waitersToUnblock;
HANDLE m_blockLock;
HANDLE m_blockQueue;
HANDLE m_unblockLock;
bool timedWait(PlatformMutex&, DWORD durationMilliseconds);
void signal(bool unblockAll);
};
#else
typedef void* PlatformMutex;
typedef void* PlatformReadWriteLock;
typedef void* PlatformCondition;
#endif
class Mutex {
WTF_MAKE_NONCOPYABLE(Mutex); WTF_MAKE_FAST_ALLOCATED;
public:
Mutex();
~Mutex();
void lock();
bool tryLock();
void unlock();
public:
PlatformMutex& impl() { return m_mutex; }
private:
PlatformMutex m_mutex;
};
typedef Locker<Mutex> MutexLocker;
class ReadWriteLock {
WTF_MAKE_NONCOPYABLE(ReadWriteLock);
public:
ReadWriteLock();
~ReadWriteLock();
void readLock();
bool tryReadLock();
void writeLock();
bool tryWriteLock();
void unlock();
private:
PlatformReadWriteLock m_readWriteLock;
};
class ThreadCondition {
WTF_MAKE_NONCOPYABLE(ThreadCondition);
public:
ThreadCondition();
~ThreadCondition();
void wait(Mutex& mutex);
// Returns true if the condition was signaled before absoluteTime, false if the absoluteTime was reached or is in the past.
// The absoluteTime is in seconds, starting on January 1, 1970. The time is assumed to use the same time zone as WTF::currentTime().
bool timedWait(Mutex&, double absoluteTime);
void signal();
void broadcast();
private:
PlatformCondition m_condition;
};
} // namespace WTF
using WTF::Mutex;
using WTF::MutexLocker;
using WTF::ThreadCondition;
#endif // ThreadingPrimitives_h
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