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58 lines
1.7 KiB
58 lines
1.7 KiB
// Copyright (c) 2011 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/threading/thread_checker_impl.h"
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#include "base/threading/thread_task_runner_handle.h"
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namespace base {
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ThreadCheckerImpl::ThreadCheckerImpl() {
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AutoLock auto_lock(lock_);
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EnsureAssigned();
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}
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ThreadCheckerImpl::~ThreadCheckerImpl() = default;
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bool ThreadCheckerImpl::CalledOnValidThread() const {
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AutoLock auto_lock(lock_);
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EnsureAssigned();
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// Always return true when called from the task from which this
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// ThreadCheckerImpl was assigned to a thread.
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if (task_token_ == TaskToken::GetForCurrentThread())
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return true;
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// If this ThreadCheckerImpl is bound to a valid SequenceToken, it must be
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// equal to the current SequenceToken and there must be a registered
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// ThreadTaskRunnerHandle. Otherwise, the fact that the current task runs on
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// the thread to which this ThreadCheckerImpl is bound is fortuitous.
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if (sequence_token_.IsValid() &&
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(sequence_token_ != SequenceToken::GetForCurrentThread() ||
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!ThreadTaskRunnerHandle::IsSet())) {
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return false;
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}
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return thread_id_ == PlatformThread::CurrentRef();
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}
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void ThreadCheckerImpl::DetachFromThread() {
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AutoLock auto_lock(lock_);
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thread_id_ = PlatformThreadRef();
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task_token_ = TaskToken();
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sequence_token_ = SequenceToken();
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}
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void ThreadCheckerImpl::EnsureAssigned() const {
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lock_.AssertAcquired();
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if (!thread_id_.is_null())
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return;
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thread_id_ = PlatformThread::CurrentRef();
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task_token_ = TaskToken::GetForCurrentThread();
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sequence_token_ = SequenceToken::GetForCurrentThread();
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}
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} // namespace base
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