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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/thread_task_runner_handle.h"
#include "base/lazy_instance.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_local.h"
namespace base {
namespace {
base::LazyInstance<base::ThreadLocalPointer<ThreadTaskRunnerHandle> >
lazy_tls_ptr = LAZY_INSTANCE_INITIALIZER;
} // namespace
// static
scoped_refptr<SingleThreadTaskRunner> ThreadTaskRunnerHandle::Get() {
ThreadTaskRunnerHandle* current = lazy_tls_ptr.Pointer()->Get();
DCHECK(current);
return current->task_runner_;
}
// static
bool ThreadTaskRunnerHandle::IsSet() {
return lazy_tls_ptr.Pointer()->Get() != NULL;
}
ThreadTaskRunnerHandle::ThreadTaskRunnerHandle(
const scoped_refptr<SingleThreadTaskRunner>& task_runner)
: task_runner_(task_runner) {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK(!lazy_tls_ptr.Pointer()->Get());
lazy_tls_ptr.Pointer()->Set(this);
}
ThreadTaskRunnerHandle::~ThreadTaskRunnerHandle() {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK_EQ(lazy_tls_ptr.Pointer()->Get(), this);
lazy_tls_ptr.Pointer()->Set(NULL);
}
} // namespace base
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