1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "base/thread_task_runner_handle.h"
7 #include "base/lazy_instance.h"
8 #include "base/single_thread_task_runner.h"
9 #include "base/threading/thread_local.h"
15 base::LazyInstance
<base::ThreadLocalPointer
<ThreadTaskRunnerHandle
> >
16 lazy_tls_ptr
= LAZY_INSTANCE_INITIALIZER
;
21 scoped_refptr
<SingleThreadTaskRunner
> ThreadTaskRunnerHandle::Get() {
22 ThreadTaskRunnerHandle
* current
= lazy_tls_ptr
.Pointer()->Get();
24 return current
->task_runner_
;
28 bool ThreadTaskRunnerHandle::IsSet() {
29 return lazy_tls_ptr
.Pointer()->Get() != NULL
;
32 ThreadTaskRunnerHandle::ThreadTaskRunnerHandle(
33 const scoped_refptr
<SingleThreadTaskRunner
>& task_runner
)
34 : task_runner_(task_runner
) {
35 DCHECK(task_runner_
->BelongsToCurrentThread());
36 DCHECK(!lazy_tls_ptr
.Pointer()->Get());
37 lazy_tls_ptr
.Pointer()->Set(this);
40 ThreadTaskRunnerHandle::~ThreadTaskRunnerHandle() {
41 DCHECK(task_runner_
->BelongsToCurrentThread());
42 DCHECK_EQ(lazy_tls_ptr
.Pointer()->Get(), this);
43 lazy_tls_ptr
.Pointer()->Set(NULL
);