47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
// 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/thread_task_runner_handle.h"
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#include "base/lazy_instance.h"
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#include "base/single_thread_task_runner.h"
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#include "base/threading/thread_local.h"
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namespace base {
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namespace {
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base::LazyInstance<base::ThreadLocalPointer<ThreadTaskRunnerHandle> >
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lazy_tls_ptr = LAZY_INSTANCE_INITIALIZER;
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} // namespace
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// static
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scoped_refptr<SingleThreadTaskRunner> ThreadTaskRunnerHandle::Get() {
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ThreadTaskRunnerHandle* current = lazy_tls_ptr.Pointer()->Get();
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DCHECK(current);
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return current->task_runner_;
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}
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// static
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bool ThreadTaskRunnerHandle::IsSet() {
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return lazy_tls_ptr.Pointer()->Get() != NULL;
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}
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ThreadTaskRunnerHandle::ThreadTaskRunnerHandle(
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const scoped_refptr<SingleThreadTaskRunner>& task_runner)
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: task_runner_(task_runner) {
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DCHECK(task_runner_->BelongsToCurrentThread());
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DCHECK(!lazy_tls_ptr.Pointer()->Get());
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lazy_tls_ptr.Pointer()->Set(this);
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}
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ThreadTaskRunnerHandle::~ThreadTaskRunnerHandle() {
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DCHECK(task_runner_->BelongsToCurrentThread());
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DCHECK_EQ(lazy_tls_ptr.Pointer()->Get(), this);
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lazy_tls_ptr.Pointer()->Set(NULL);
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}
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} // namespace base
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