47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/sequence_checker_impl.h"
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namespace base {
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SequenceCheckerImpl::SequenceCheckerImpl()
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: sequence_token_assigned_(false) {
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AutoLock auto_lock(lock_);
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EnsureSequenceTokenAssigned();
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}
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SequenceCheckerImpl::~SequenceCheckerImpl() {}
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bool SequenceCheckerImpl::CalledOnValidSequencedThread() const {
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AutoLock auto_lock(lock_);
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EnsureSequenceTokenAssigned();
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// If this thread is not associated with a SequencedWorkerPool,
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// SequenceChecker behaves as a ThreadChecker. See header for details.
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if (!sequence_token_.IsValid())
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return thread_checker_.CalledOnValidThread();
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return sequence_token_.Equals(
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SequencedWorkerPool::GetSequenceTokenForCurrentThread());
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}
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void SequenceCheckerImpl::DetachFromSequence() {
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AutoLock auto_lock(lock_);
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thread_checker_.DetachFromThread();
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sequence_token_assigned_ = false;
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sequence_token_ = SequencedWorkerPool::SequenceToken();
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}
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void SequenceCheckerImpl::EnsureSequenceTokenAssigned() const {
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lock_.AssertAcquired();
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if (sequence_token_assigned_)
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return;
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sequence_token_assigned_ = true;
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sequence_token_ = SequencedWorkerPool::GetSequenceTokenForCurrentThread();
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}
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} // namespace base
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