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comparison: security/sandbox/chromium/base/sequence_checker_impl.h
security/sandbox/chromium/base/sequence_checker_impl.h
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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BASE_SEQUENCE_CHECKER_IMPL_H_ | |
| 6 #define BASE_SEQUENCE_CHECKER_IMPL_H_ | |
| 7 | |
| 8 #include "base/base_export.h" | |
| 9 #include "base/basictypes.h" | |
| 10 #include "base/synchronization/lock.h" | |
| 11 #include "base/threading/sequenced_worker_pool.h" | |
| 12 #include "base/threading/thread_checker_impl.h" | |
| 13 | |
| 14 namespace base { | |
| 15 | |
| 16 // SequenceCheckerImpl is used to help verify that some methods of a | |
| 17 // class are called in sequence -- that is, called from the same | |
| 18 // SequencedTaskRunner. It is a generalization of ThreadChecker; in | |
| 19 // particular, it behaves exactly like ThreadChecker if constructed | |
| 20 // on a thread that is not part of a SequencedWorkerPool. | |
| 21 class BASE_EXPORT SequenceCheckerImpl { | |
| 22 public: | |
| 23 SequenceCheckerImpl(); | |
| 24 ~SequenceCheckerImpl(); | |
| 25 | |
| 26 // Returns whether the we are being called on the same sequence token | |
| 27 // as previous calls. If there is no associated sequence, then returns | |
| 28 // whether we are being called on the underlying ThreadChecker's thread. | |
| 29 bool CalledOnValidSequencedThread() const; | |
| 30 | |
| 31 // Unbinds the checker from the currently associated sequence. The | |
| 32 // checker will be re-bound on the next call to CalledOnValidSequence(). | |
| 33 void DetachFromSequence(); | |
| 34 | |
| 35 private: | |
| 36 void EnsureSequenceTokenAssigned() const; | |
| 37 | |
| 38 // Guards all variables below. | |
| 39 mutable Lock lock_; | |
| 40 | |
| 41 // Used if |sequence_token_| is not valid. | |
| 42 ThreadCheckerImpl thread_checker_; | |
| 43 mutable bool sequence_token_assigned_; | |
| 44 | |
| 45 mutable SequencedWorkerPool::SequenceToken sequence_token_; | |
| 46 | |
| 47 DISALLOW_COPY_AND_ASSIGN(SequenceCheckerImpl); | |
| 48 }; | |
| 49 | |
| 50 } // namespace base | |
| 51 | |
| 52 #endif // BASE_SEQUENCE_CHECKER_IMPL_H_ |
