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. 4 5#include "base/mac/libdispatch_task_runner.h" 6 7#include <stdint.h> 8 9#include "base/callback.h" 10 11namespace base { 12namespace mac { 13 14LibDispatchTaskRunner::LibDispatchTaskRunner(const char* name) 15 : queue_(dispatch_queue_create(name, NULL)), 16 queue_finalized_(false, false) { 17 dispatch_set_context(queue_, this); 18 dispatch_set_finalizer_f(queue_, &LibDispatchTaskRunner::Finalizer); 19} 20 21bool LibDispatchTaskRunner::PostDelayedTask( 22 const tracked_objects::Location& /* from_here */, 23 const Closure& task, 24 base::TimeDelta delay) { 25 if (!queue_) 26 return false; 27 28 // The block runtime would implicitly copy the reference, not the object 29 // it's referencing. Copy the closure into block storage so it's available 30 // to run. 31 __block const Closure task_copy = task; 32 void(^run_task)(void) = ^{ 33 task_copy.Run(); 34 }; 35 36 int64_t delay_nano = 37 delay.InMicroseconds() * base::Time::kNanosecondsPerMicrosecond; 38 if (delay_nano > 0) { 39 dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, delay_nano); 40 dispatch_after(time, queue_, run_task); 41 } else { 42 dispatch_async(queue_, run_task); 43 } 44 return true; 45} 46 47bool LibDispatchTaskRunner::RunsTasksOnCurrentThread() const { 48 return queue_ == dispatch_get_current_queue(); 49} 50 51bool LibDispatchTaskRunner::PostNonNestableDelayedTask( 52 const tracked_objects::Location& from_here, 53 const Closure& task, 54 base::TimeDelta delay) { 55 return PostDelayedTask(from_here, task, delay); 56} 57 58void LibDispatchTaskRunner::Shutdown() { 59 dispatch_release(queue_); 60 queue_ = NULL; 61 queue_finalized_.Wait(); 62} 63 64dispatch_queue_t LibDispatchTaskRunner::GetDispatchQueue() const { 65 return queue_; 66} 67 68LibDispatchTaskRunner::~LibDispatchTaskRunner() { 69 if (queue_) { 70 dispatch_set_context(queue_, NULL); 71 dispatch_set_finalizer_f(queue_, NULL); 72 dispatch_release(queue_); 73 } 74} 75 76void LibDispatchTaskRunner::Finalizer(void* context) { 77 LibDispatchTaskRunner* self = static_cast<LibDispatchTaskRunner*>(context); 78 self->queue_finalized_.Signal(); 79} 80 81} // namespace mac 82} // namespace base 83