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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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_THREADING_PRIMITIVES_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_THREADING_PRIMITIVES_H_
#include "base/macros.h"
#include "base/thread_annotations.h"
#include "build/build_config.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/assertions.h"
#include "third_party/blink/renderer/platform/wtf/locker.h"
#include "third_party/blink/renderer/platform/wtf/wtf_export.h"
#if defined(OS_WIN)
#include <windows.h>
#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
#include <pthread.h>
#endif
namespace WTF {
#if defined(OS_WIN)
struct PlatformMutex {
CRITICAL_SECTION internal_mutex_;
size_t recursion_count_;
};
typedef CONDITION_VARIABLE PlatformCondition;
#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
struct PlatformMutex {
pthread_mutex_t internal_mutex_;
#if DCHECK_IS_ON()
size_t recursion_count_;
#endif
};
typedef pthread_cond_t PlatformCondition;
#endif
class WTF_EXPORT MutexBase {
USING_FAST_MALLOC(MutexBase);
public:
~MutexBase();
void lock();
void unlock();
#if DCHECK_IS_ON()
// Deprecated in favour of AssertAcquired.
bool Locked() const { return mutex_.recursion_count_ > 0; }
void AssertAcquired() const { DCHECK(Locked()); }
#else
void AssertAcquired() const {}
#endif
public:
PlatformMutex& Impl() { return mutex_; }
protected:
MutexBase(bool recursive);
PlatformMutex mutex_;
DISALLOW_COPY_AND_ASSIGN(MutexBase);
};
class LOCKABLE WTF_EXPORT Mutex : public MutexBase {
public:
Mutex() : MutexBase(false) {}
bool TryLock() EXCLUSIVE_TRYLOCK_FUNCTION(true);
// Overridden solely for the purpose of annotating them.
// The compiler is expected to optimize the calls away.
void lock() EXCLUSIVE_LOCK_FUNCTION() { MutexBase::lock(); }
void unlock() UNLOCK_FUNCTION() { MutexBase::unlock(); }
void AssertAcquired() const ASSERT_EXCLUSIVE_LOCK() {
MutexBase::AssertAcquired();
}
};
// RecursiveMutex is deprecated AND WILL BE REMOVED.
// https://crbug.com/856641
class WTF_EXPORT RecursiveMutex : public MutexBase {
public:
RecursiveMutex() : MutexBase(true) {}
bool TryLock();
};
class SCOPED_LOCKABLE MutexLocker final {
STACK_ALLOCATED();
public:
MutexLocker(Mutex& mutex) EXCLUSIVE_LOCK_FUNCTION(mutex) : mutex_(mutex) {
mutex_.lock();
}
~MutexLocker() UNLOCK_FUNCTION() { mutex_.unlock(); }
private:
Mutex& mutex_;
DISALLOW_COPY_AND_ASSIGN(MutexLocker);
};
using RecursiveMutexLocker = Locker<RecursiveMutex>;
class MutexTryLocker final {
STACK_ALLOCATED();
public:
MutexTryLocker(Mutex& mutex) : mutex_(mutex), locked_(mutex.TryLock()) {}
~MutexTryLocker() {
if (locked_)
mutex_.unlock();
}
bool Locked() const { return locked_; }
private:
Mutex& mutex_;
bool locked_;
DISALLOW_COPY_AND_ASSIGN(MutexTryLocker);
};
class WTF_EXPORT ThreadCondition final {
USING_FAST_MALLOC(ThreadCondition); // Only HeapTest.cpp requires.
public:
ThreadCondition();
~ThreadCondition();
void Wait(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 absolute_time);
void Signal();
void Broadcast();
private:
PlatformCondition condition_;
DISALLOW_COPY_AND_ASSIGN(ThreadCondition);
};
} // namespace WTF
using WTF::MutexBase;
using WTF::Mutex;
using WTF::RecursiveMutex;
using WTF::MutexLocker;
using WTF::MutexTryLocker;
using WTF::RecursiveMutexLocker;
using WTF::ThreadCondition;
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_THREADING_PRIMITIVES_H_
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