64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
// 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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#include "base/thread_annotations.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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// Note: This is only a check, not a "lock". It is marked "LOCKABLE" only in
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// order to support thread_annotations.h.
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class LOCKABLE BASE_EXPORT SequenceCheckerImpl {
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public:
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SequenceCheckerImpl();
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~SequenceCheckerImpl();
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// Allow move construct/assign. This must be called on |other|'s associated
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// sequence and assignment can only be made into a SequenceCheckerImpl which
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// is detached or already associated with the current sequence. This isn't
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// thread-safe (|this| and |other| shouldn't be in use while this move is
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// performed). If the assignment was legal, the resulting SequenceCheckerImpl
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// will be bound to the current sequence and |other| will be detached.
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SequenceCheckerImpl(SequenceCheckerImpl&& other);
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SequenceCheckerImpl& operator=(SequenceCheckerImpl&& other);
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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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// Calls straight to ThreadLocalStorage::HasBeenDestroyed(). Exposed purely
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// for 'friend' to work.
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static bool HasThreadLocalStorageBeenDestroyed();
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mutable Lock lock_;
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mutable std::unique_ptr<Core> core_ GUARDED_BY(lock_);
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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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