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 <memory> 9 10 #include "base/base_export.h" 11 #include "base/compiler_specific.h" 12 #include "base/macros.h" 13 #include "base/synchronization/lock.h" 14 15 namespace base { 16 17 // Real implementation of SequenceChecker for use in debug mode or for temporary 18 // use in release mode (e.g. to CHECK on a threading issue seen only in the 19 // wild). 20 // 21 // Note: You should almost always use the SequenceChecker class to get the right 22 // version for your build configuration. 23 class BASE_EXPORT SequenceCheckerImpl { 24 public: 25 SequenceCheckerImpl(); 26 ~SequenceCheckerImpl(); 27 28 // Returns true if called in sequence with previous calls to this method and 29 // the constructor. 30 bool CalledOnValidSequence() const WARN_UNUSED_RESULT; 31 32 // Unbinds the checker from the currently associated sequence. The checker 33 // will be re-bound on the next call to CalledOnValidSequence(). 34 void DetachFromSequence(); 35 36 private: 37 class Core; 38 39 // Guards all variables below. 40 mutable Lock lock_; 41 mutable std::unique_ptr<Core> core_; 42 43 DISALLOW_COPY_AND_ASSIGN(SequenceCheckerImpl); 44 }; 45 46 } // namespace base 47 48 #endif // BASE_SEQUENCE_CHECKER_IMPL_H_ 49
