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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 <atomic>
#include "base/check_op.h"
#include "base/gtest_prod_util.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/wtf_export.h"
namespace blink {
class DeferredTaskHandler;
}
namespace WTF {
// RecursiveMutex is deprecated AND WILL BE REMOVED.
// https://crbug.com/856641
class LOCKABLE WTF_EXPORT RecursiveMutex {
public:
// Overridden solely for the purpose of annotating them.
// The compiler is expected to optimize the calls away.
void lock() EXCLUSIVE_LOCK_FUNCTION();
void unlock() UNLOCK_FUNCTION();
void AssertAcquired() const ASSERT_EXCLUSIVE_LOCK() {
// TS_UNCHECKED_READ: Either we are the owner and then the value can be
// read, or we aren't, and we are guaranteed to not see our own thread ID.
DCHECK_EQ(TS_UNCHECKED_READ(owner_), base::PlatformThread::CurrentId());
}
bool TryLock() EXCLUSIVE_TRYLOCK_FUNCTION(true);
private:
// Private constructor to ensure that no new users appear. This class will be
// removed.
RecursiveMutex() = default;
void UpdateStateAfterLockAcquired(base::PlatformThreadId thread_id)
EXCLUSIVE_LOCKS_REQUIRED(lock_);
base::Lock lock_;
// Atomic only used to avoid load shearing.
std::atomic<base::PlatformThreadId> owner_ GUARDED_BY(lock_) =
base::kInvalidThreadId;
uint64_t lock_depth_ GUARDED_BY(lock_) = 0;
// DO NOT ADD any new caller.
friend class ::blink::DeferredTaskHandler;
FRIEND_TEST_ALL_PREFIXES(RecursiveMutexTest, LockUnlock);
FRIEND_TEST_ALL_PREFIXES(RecursiveMutexTest, LockUnlockRecursive);
FRIEND_TEST_ALL_PREFIXES(RecursiveMutexTest, LockUnlockThreads);
};
} // namespace WTF
using WTF::RecursiveMutex;
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_THREADING_PRIMITIVES_H_
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