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 "base/callback.h" 8 9 namespace base { 10 namespace mac { 11 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); 17 } 18 19 bool LibDispatchTaskRunner::PostDelayedTask( 20 const tracked_objects::Location& from_here, 21 const Closure& task, 22 base::TimeDelta delay) { 23 if (!queue_) 24 return false; 25 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 28 // to run. 29 __block const Closure task_copy = task; 30 void(^run_task)(void) = ^{ 31 task_copy.Run(); 32 }; 33 34 int64 delay_nano = 35 delay.InMicroseconds() * base::Time::kNanosecondsPerMicrosecond; 36 if (delay_nano > 0) { 37 dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, delay_nano); 38 dispatch_after(time, queue_, run_task); 39 } else { 40 dispatch_async(queue_, run_task); 41 } 42 return true; 43 } 44 45 bool LibDispatchTaskRunner::RunsTasksOnCurrentThread() const { 46 return queue_ == dispatch_get_current_queue(); 47 } 48 49 bool LibDispatchTaskRunner::PostNonNestableDelayedTask( 50 const tracked_objects::Location& from_here, 51 const Closure& task, 52 base::TimeDelta delay) { 53 return PostDelayedTask(from_here, task, delay); 54 } 55 56 void LibDispatchTaskRunner::Shutdown() { 57 dispatch_release(queue_); 58 queue_ = NULL; 59 queue_finalized_.Wait(); 60 } 61 62 dispatch_queue_t LibDispatchTaskRunner::GetDispatchQueue() const { 63 return queue_; 64 } 65 66 LibDispatchTaskRunner::~LibDispatchTaskRunner() { 67 if (queue_) { 68 dispatch_set_context(queue_, NULL); 69 dispatch_set_finalizer_f(queue_, NULL); 70 dispatch_release(queue_); 71 } 72 } 73 74 void LibDispatchTaskRunner::Finalizer(void* context) { 75 LibDispatchTaskRunner* self = static_cast<LibDispatchTaskRunner*>(context); 76 self->queue_finalized_.Signal(); 77 } 78 79 } // namespace mac 80 } // namespace base 81
