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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_BASE_REENTRANCY_CHECKER_H_
#define MEDIA_BASE_REENTRANCY_CHECKER_H_
#include "base/logging.h"
#include "base/macros.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "media/base/media_export.h"
// Asserts that a non-reentrant scope (which can span multiple methods) is not
// reentered.
//
// No-op and zero-sized when DCHECKs are disabled at build time.
//
// Failures are reported by LOG(FATAL):
// [...:FATAL:reentrancy_checker.cc(15)] Non-reentrant scope reentered
// #0 0x7f12ef2ee8dd base::debug::StackTrace::StackTrace()
// #1 0x7f12eefdffaa base::debug::StackTrace::StackTrace()
// #2 0x7f12ef051e0b logging::LogMessage::~LogMessage()
// #3 0x7f12edc8bfc6 media::NonReentrantScope::NonReentrantScope()
// #4 0x7f12edd93e41 MyClass::MyMethod()
//
// Usage:
// class MyClass {
// public:
// void MyMethod() {
// NON_REENTRANT_SCOPE(my_reentrancy_checker_);
// ...
// }
//
// private:
// REENTRANCY_CHECKER(my_reentrancy_checker_);
// };
#if DCHECK_IS_ON()
#define REENTRANCY_CHECKER(name) ::base::Lock name
#define NON_REENTRANT_SCOPE(name) ::media::NonReentrantScope name##scope(name)
#else // DCHECK_IS_ON()
#define REENTRANCY_CHECKER(name) static_assert(true, "")
#define NON_REENTRANT_SCOPE(name)
#endif // DCHECK_IS_ON()
namespace media {
// Implementation of NON_REENTRANT_SCOPE(). Do not use directly.
class SCOPED_LOCKABLE MEDIA_EXPORT NonReentrantScope {
public:
explicit NonReentrantScope(base::Lock& lock) EXCLUSIVE_LOCK_FUNCTION(lock);
~NonReentrantScope() UNLOCK_FUNCTION();
private:
base::Lock& lock_;
bool is_lock_holder_ = false;
DISALLOW_COPY_AND_ASSIGN(NonReentrantScope);
};
} // namespace media
#endif // MEDIA_BASE_REENTRANCY_CHECKER_H_
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