// 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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#include "base/logging.h"
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#include "base/memory/ptr_util.h"
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#include "base/sequence_token.h"
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#include "base/threading/thread_checker_impl.h"
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namespace base {
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class SequenceCheckerImpl::Core {
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public:
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Core() : sequence_token_(SequenceToken::GetForCurrentThread()) {}
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~Core() = default;
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bool CalledOnValidSequence() const {
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if (sequence_token_.IsValid())
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return sequence_token_ == SequenceToken::GetForCurrentThread();
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// SequenceChecker behaves as a ThreadChecker when it is not bound to a
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// valid sequence token.
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return thread_checker_.CalledOnValidThread();
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}
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private:
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SequenceToken sequence_token_;
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// Used when |sequence_token_| is invalid.
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ThreadCheckerImpl thread_checker_;
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};
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SequenceCheckerImpl::SequenceCheckerImpl() : core_(std::make_unique<Core>()) {}
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SequenceCheckerImpl::~SequenceCheckerImpl() = default;
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bool SequenceCheckerImpl::CalledOnValidSequence() const {
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AutoLock auto_lock(lock_);
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if (!core_)
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core_ = std::make_unique<Core>();
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return core_->CalledOnValidSequence();
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}
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void SequenceCheckerImpl::DetachFromSequence() {
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AutoLock auto_lock(lock_);
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core_.reset();
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}
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} // namespace base
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