1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/security/sandbox/chromium/base/sequence_checker.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,68 @@
1.4 +// Copyright (c) 2012 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#ifndef BASE_SEQUENCE_CHECKER_H_
1.9 +#define BASE_SEQUENCE_CHECKER_H_
1.10 +
1.11 +#include "base/memory/ref_counted.h"
1.12 +
1.13 +// See comments for the similar block in thread_checker.h.
1.14 +#if (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON))
1.15 +#define ENABLE_SEQUENCE_CHECKER 1
1.16 +#else
1.17 +#define ENABLE_SEQUENCE_CHECKER 0
1.18 +#endif
1.19 +
1.20 +#if ENABLE_SEQUENCE_CHECKER
1.21 +#include "base/sequence_checker_impl.h"
1.22 +#endif
1.23 +
1.24 +namespace base {
1.25 +
1.26 +class SequencedTaskRunner;
1.27 +
1.28 +// Do nothing implementation, for use in release mode.
1.29 +//
1.30 +// Note: You should almost always use the SequenceChecker class to get
1.31 +// the right version for your build configuration.
1.32 +class SequenceCheckerDoNothing {
1.33 + public:
1.34 + bool CalledOnValidSequencedThread() const {
1.35 + return true;
1.36 + }
1.37 +
1.38 + void DetachFromSequence() {}
1.39 +};
1.40 +
1.41 +// SequenceChecker is a helper class used to help verify that some
1.42 +// methods of a class are called in sequence -- that is, called from
1.43 +// the same SequencedTaskRunner. It is a generalization of
1.44 +// ThreadChecker; see comments in sequence_checker_impl.h for details.
1.45 +//
1.46 +// Example:
1.47 +// class MyClass {
1.48 +// public:
1.49 +// void Foo() {
1.50 +// DCHECK(sequence_checker_.CalledOnValidSequence());
1.51 +// ... (do stuff) ...
1.52 +// }
1.53 +//
1.54 +// private:
1.55 +// SequenceChecker sequence_checker_;
1.56 +// }
1.57 +//
1.58 +// In Release mode, CalledOnValidSequence will always return true.
1.59 +#if ENABLE_SEQUENCE_CHECKER
1.60 +class SequenceChecker : public SequenceCheckerImpl {
1.61 +};
1.62 +#else
1.63 +class SequenceChecker : public SequenceCheckerDoNothing {
1.64 +};
1.65 +#endif // ENABLE_SEQUENCE_CHECKER
1.66 +
1.67 +#undef ENABLE_SEQUENCE_CHECKER
1.68 +
1.69 +} // namespace base
1.70 +
1.71 +#endif // BASE_SEQUENCE_CHECKER_H_
