| // 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 <memory> |
| |
| #include "base/base_export.h" |
| #include "base/compiler_specific.h" |
| #include "base/macros.h" |
| #include "base/synchronization/lock.h" |
| #include "base/thread_annotations.h" |
| |
| namespace base { |
| |
| // Real implementation of SequenceChecker for use in debug mode or for temporary |
| // use in release mode (e.g. to CHECK on a threading issue seen only in the |
| // wild). |
| // |
| // Note: You should almost always use the SequenceChecker class to get the right |
| // version for your build configuration. |
| class BASE_EXPORT SequenceCheckerImpl { |
| public: |
| SequenceCheckerImpl(); |
| ~SequenceCheckerImpl(); |
| |
| // Allow move construct/assign. This must be called on |other|'s associated |
| // sequence and assignment can only be made into a SequenceCheckerImpl which |
| // is detached or already associated with the current sequence. This isn't |
| // thread-safe (|this| and |other| shouldn't be in use while this move is |
| // performed). If the assignment was legal, the resulting SequenceCheckerImpl |
| // will be bound to the current sequence and |other| will be detached. |
| SequenceCheckerImpl(SequenceCheckerImpl&& other); |
| SequenceCheckerImpl& operator=(SequenceCheckerImpl&& other); |
| |
| // Returns true if called in sequence with previous calls to this method and |
| // the constructor. |
| bool CalledOnValidSequence() const WARN_UNUSED_RESULT; |
| |
| // Unbinds the checker from the currently associated sequence. The checker |
| // will be re-bound on the next call to CalledOnValidSequence(). |
| void DetachFromSequence(); |
| |
| private: |
| class Core; |
| |
| // Calls straight to ThreadLocalStorage::HasBeenDestroyed(). Exposed purely |
| // for 'friend' to work. |
| static bool HasThreadLocalStorageBeenDestroyed(); |
| |
| mutable Lock lock_; |
| mutable std::unique_ptr<Core> core_ GUARDED_BY(lock_); |
| |
| DISALLOW_COPY_AND_ASSIGN(SequenceCheckerImpl); |
| }; |
| |
| } // namespace base |
| |
| #endif // BASE_SEQUENCE_CHECKER_IMPL_H_ |