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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 "wtf/Assertions.h"
#include "wtf/FastAllocBase.h"
#include "wtf/Locker.h"
#include "wtf/Noncopyable.h"
#include "wtf/WTFExport.h"
#if OS(WIN)
#include <windows.h>
#endif
#if USE(PTHREADS)
#include <pthread.h>
#endif
namespace WTF {
#if USE(PTHREADS)
struct PlatformMutex {
pthread_mutex_t m_internalMutex;
#if ENABLE(ASSERT)
size_t m_recursionCount;
#endif
};
typedef pthread_cond_t PlatformCondition;
#elif OS(WIN)
struct PlatformMutex {
CRITICAL_SECTION m_internalMutex;
size_t m_recursionCount;
};
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* PlatformCondition;
#endif
class WTF_EXPORT MutexBase {
WTF_MAKE_NONCOPYABLE(MutexBase); WTF_MAKE_FAST_ALLOCATED;
public:
~MutexBase();
void lock();
void unlock();
#if ENABLE(ASSERT)
bool locked() { return m_mutex.m_recursionCount > 0; }
#endif
public:
PlatformMutex& impl() { return m_mutex; }
protected:
MutexBase(bool recursive);
PlatformMutex m_mutex;
};
class WTF_EXPORT Mutex : public MutexBase {
public:
Mutex() : MutexBase(false) { }
bool tryLock();
};
class WTF_EXPORT RecursiveMutex : public MutexBase {
public:
RecursiveMutex() : MutexBase(true) { }
bool tryLock();
};
typedef Locker<MutexBase> MutexLocker;
class MutexTryLocker {
WTF_MAKE_NONCOPYABLE(MutexTryLocker);
public:
MutexTryLocker(Mutex& mutex) : m_mutex(mutex), m_locked(mutex.tryLock()) { }
~MutexTryLocker()
{
if (m_locked)
m_mutex.unlock();
}
bool locked() const { return m_locked; }
private:
Mutex& m_mutex;
bool m_locked;
};
class WTF_EXPORT ThreadCondition {
WTF_MAKE_NONCOPYABLE(ThreadCondition);
public:
ThreadCondition();
~ThreadCondition();
void wait(MutexBase&);
// 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(MutexBase&, double absoluteTime);
void signal();
void broadcast();
private:
PlatformCondition m_condition;
};
#if OS(WIN)
// The absoluteTime is in seconds, starting on January 1, 1970. The time is assumed to use the same time zone as WTF::currentTime().
// Returns an interval in milliseconds suitable for passing to one of the Win32 wait functions (e.g., ::WaitForSingleObject).
DWORD absoluteTimeToWaitTimeoutInterval(double absoluteTime);
#endif
} // namespace WTF
using WTF::MutexBase;
using WTF::Mutex;
using WTF::RecursiveMutex;
using WTF::MutexLocker;
using WTF::MutexTryLocker;
using WTF::ThreadCondition;
#if OS(WIN)
using WTF::absoluteTimeToWaitTimeoutInterval;
#endif
#endif // ThreadingPrimitives_h
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