1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/security/sandbox/chromium/base/sequence_checker_impl.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,52 @@
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_IMPL_H_
1.9 +#define BASE_SEQUENCE_CHECKER_IMPL_H_
1.10 +
1.11 +#include "base/base_export.h"
1.12 +#include "base/basictypes.h"
1.13 +#include "base/synchronization/lock.h"
1.14 +#include "base/threading/sequenced_worker_pool.h"
1.15 +#include "base/threading/thread_checker_impl.h"
1.16 +
1.17 +namespace base {
1.18 +
1.19 +// SequenceCheckerImpl is used to help verify that some methods of a
1.20 +// class are called in sequence -- that is, called from the same
1.21 +// SequencedTaskRunner. It is a generalization of ThreadChecker; in
1.22 +// particular, it behaves exactly like ThreadChecker if constructed
1.23 +// on a thread that is not part of a SequencedWorkerPool.
1.24 +class BASE_EXPORT SequenceCheckerImpl {
1.25 + public:
1.26 + SequenceCheckerImpl();
1.27 + ~SequenceCheckerImpl();
1.28 +
1.29 + // Returns whether the we are being called on the same sequence token
1.30 + // as previous calls. If there is no associated sequence, then returns
1.31 + // whether we are being called on the underlying ThreadChecker's thread.
1.32 + bool CalledOnValidSequencedThread() const;
1.33 +
1.34 + // Unbinds the checker from the currently associated sequence. The
1.35 + // checker will be re-bound on the next call to CalledOnValidSequence().
1.36 + void DetachFromSequence();
1.37 +
1.38 + private:
1.39 + void EnsureSequenceTokenAssigned() const;
1.40 +
1.41 + // Guards all variables below.
1.42 + mutable Lock lock_;
1.43 +
1.44 + // Used if |sequence_token_| is not valid.
1.45 + ThreadCheckerImpl thread_checker_;
1.46 + mutable bool sequence_token_assigned_;
1.47 +
1.48 + mutable SequencedWorkerPool::SequenceToken sequence_token_;
1.49 +
1.50 + DISALLOW_COPY_AND_ASSIGN(SequenceCheckerImpl);
1.51 +};
1.52 +
1.53 +} // namespace base
1.54 +
1.55 +#endif // BASE_SEQUENCE_CHECKER_IMPL_H_
