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// Copyright (c) 2012 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 BASE_SEQUENCE_CHECKER_IMPL_H_
#define BASE_SEQUENCE_CHECKER_IMPL_H_
#include "base/base_export.h"
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread_checker_impl.h"
namespace base {
class SequencedTaskRunner;
// SequenceCheckerImpl is used to help verify that some methods of a
// class are called in sequence -- that is, called from the same
// SequencedTaskRunner. It is a generalization of ThreadChecker; in
// particular, it behaves exactly like ThreadChecker if its passed a
// NULL SequencedTaskRunner.
class BASE_EXPORT SequenceCheckerImpl {
public:
// |sequenced_task_runner| can be NULL. In that case, this object
// behaves exactly like a ThreadChecker bound to the current thread,
// i.e. CalledOnValidSequence() behaves like CalledOnValidThread().
explicit SequenceCheckerImpl(
const scoped_refptr<SequencedTaskRunner>& sequenced_task_runner);
~SequenceCheckerImpl();
// Returns whether the we are being called on the underyling
// SequencedTaskRunner. If we're not bound to a
// |sequenced_task_runner|, returns whether we are being called on
// the underlying ThreadChecker's thread.
bool CalledOnValidSequence() const;
// Changes the underyling SequencedTaskRunner.
// |sequenced_task_runner| can be NULL. In that case, this object
// behaves exactly like a ThreadChecker that has been detached from
// its thread, i.e. we will be bound to the thread on which we next
// call CalledOnValidSequence().
void ChangeSequence(
const scoped_refptr<SequencedTaskRunner>& sequenced_task_runner);
private:
// Guards all variables below.
mutable Lock lock_;
scoped_refptr<SequencedTaskRunner> sequenced_task_runner_;
// Used if |sequenced_task_runner_| is NULL.
ThreadCheckerImpl thread_checker_;
DISALLOW_COPY_AND_ASSIGN(SequenceCheckerImpl);
};
} // namespace base
#endif // BASE_SEQUENCE_CHECKER_IMPL_H_
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