// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_SEQUENCE_CHECKER_IMPL_H_
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#define BASE_SEQUENCE_CHECKER_IMPL_H_
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#include <memory>
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#include "base/base_export.h"
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#include "base/compiler_specific.h"
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#include "base/macros.h"
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#include "base/synchronization/lock.h"
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namespace base {
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// Real implementation of SequenceChecker for use in debug mode or for temporary
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// use in release mode (e.g. to CHECK on a threading issue seen only in the
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// wild).
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//
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// Note: You should almost always use the SequenceChecker class to get the right
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// version for your build configuration.
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class BASE_EXPORT SequenceCheckerImpl {
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public:
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SequenceCheckerImpl();
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~SequenceCheckerImpl();
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// Returns true if called in sequence with previous calls to this method and
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// the constructor.
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bool CalledOnValidSequence() const WARN_UNUSED_RESULT;
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// Unbinds the checker from the currently associated sequence. The checker
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// will be re-bound on the next call to CalledOnValidSequence().
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void DetachFromSequence();
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private:
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class Core;
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// Guards all variables below.
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mutable Lock lock_;
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mutable std::unique_ptr<Core> core_;
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DISALLOW_COPY_AND_ASSIGN(SequenceCheckerImpl);
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};
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} // namespace base
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#endif // BASE_SEQUENCE_CHECKER_IMPL_H_
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