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/mac/libdispatch_task_runner.h"
7 #include "base/callback.h"
12 LibDispatchTaskRunner::LibDispatchTaskRunner(const char* name)
13 : queue_(dispatch_queue_create(name, NULL)),
14 queue_finalized_(false, false) {
15 dispatch_set_context(queue_, this);
16 dispatch_set_finalizer_f(queue_, &LibDispatchTaskRunner::Finalizer);
19 bool LibDispatchTaskRunner::PostDelayedTask(
20 const tracked_objects::Location& from_here,
22 base::TimeDelta delay) {
26 // The block runtime would implicitly copy the reference, not the object
27 // it's referencing. Copy the closure into block storage so it's available
29 __block const Closure task_copy = task;
30 void(^run_task)(void) = ^{
35 delay.InMicroseconds() * base::Time::kNanosecondsPerMicrosecond;
37 dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, delay_nano);
38 dispatch_after(time, queue_, run_task);
40 dispatch_async(queue_, run_task);
45 bool LibDispatchTaskRunner::RunsTasksOnCurrentThread() const {
46 return queue_ == dispatch_get_current_queue();
49 bool LibDispatchTaskRunner::PostNonNestableDelayedTask(
50 const tracked_objects::Location& from_here,
52 base::TimeDelta delay) {
53 return PostDelayedTask(from_here, task, delay);
56 void LibDispatchTaskRunner::Shutdown() {
57 dispatch_release(queue_);
59 queue_finalized_.Wait();
62 dispatch_queue_t LibDispatchTaskRunner::GetDispatchQueue() const {
66 LibDispatchTaskRunner::~LibDispatchTaskRunner() {
68 dispatch_set_context(queue_, NULL);
69 dispatch_set_finalizer_f(queue_, NULL);
70 dispatch_release(queue_);
74 void LibDispatchTaskRunner::Finalizer(void* context) {
75 LibDispatchTaskRunner* self = static_cast<LibDispatchTaskRunner*>(context);
76 self->queue_finalized_.Signal();