15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/thread_task_runner_handle.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/lazy_instance.h" 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/single_thread_task_runner.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/threading/thread_local.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace base { 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace { 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)base::LazyInstance<base::ThreadLocalPointer<ThreadTaskRunnerHandle> > 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) lazy_tls_ptr = LAZY_INSTANCE_INITIALIZER; 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// static 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)scoped_refptr<SingleThreadTaskRunner> ThreadTaskRunnerHandle::Get() { 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ThreadTaskRunnerHandle* current = lazy_tls_ptr.Pointer()->Get(); 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(current); 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return current->task_runner_; 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 27c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)// static 28c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)bool ThreadTaskRunnerHandle::IsSet() { 29c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) return lazy_tls_ptr.Pointer()->Get() != NULL; 30c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)} 31c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)ThreadTaskRunnerHandle::ThreadTaskRunnerHandle( 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<SingleThreadTaskRunner>& task_runner) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : task_runner_(task_runner) { 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(task_runner_->BelongsToCurrentThread()); 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!lazy_tls_ptr.Pointer()->Get()); 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) lazy_tls_ptr.Pointer()->Set(this); 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)ThreadTaskRunnerHandle::~ThreadTaskRunnerHandle() { 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(task_runner_->BelongsToCurrentThread()); 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(lazy_tls_ptr.Pointer()->Get(), this); 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) lazy_tls_ptr.Pointer()->Set(NULL); 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace base 47