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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/mac/libdispatch_task_runner.h"
#include "base/callback.h"
namespace base {
namespace mac {
LibDispatchTaskRunner::LibDispatchTaskRunner(const char* name)
: queue_(dispatch_queue_create(name, NULL)),
queue_finalized_(false, false) {
dispatch_set_context(queue_, this);
dispatch_set_finalizer_f(queue_, &LibDispatchTaskRunner::Finalizer);
}
bool LibDispatchTaskRunner::PostDelayedTask(
const tracked_objects::Location& from_here,
const Closure& task,
base::TimeDelta delay) {
if (!queue_)
return false;
// The block runtime would implicitly copy the reference, not the object
// it's referencing. Copy the closure into block storage so it's available
// to run.
__block const Closure task_copy = task;
void(^run_task)(void) = ^{
task_copy.Run();
};
int64 delay_nano =
delay.InMicroseconds() * base::Time::kNanosecondsPerMicrosecond;
if (delay_nano > 0) {
dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, delay_nano);
dispatch_after(time, queue_, run_task);
} else {
dispatch_async(queue_, run_task);
}
return true;
}
bool LibDispatchTaskRunner::RunsTasksOnCurrentThread() const {
return queue_ == dispatch_get_current_queue();
}
bool LibDispatchTaskRunner::PostNonNestableDelayedTask(
const tracked_objects::Location& from_here,
const Closure& task,
base::TimeDelta delay) {
return PostDelayedTask(from_here, task, delay);
}
void LibDispatchTaskRunner::Shutdown() {
dispatch_release(queue_);
queue_ = NULL;
queue_finalized_.Wait();
}
dispatch_queue_t LibDispatchTaskRunner::GetDispatchQueue() const {
return queue_;
}
LibDispatchTaskRunner::~LibDispatchTaskRunner() {
if (queue_) {
dispatch_set_context(queue_, NULL);
dispatch_set_finalizer_f(queue_, NULL);
dispatch_release(queue_);
}
}
void LibDispatchTaskRunner::Finalizer(void* context) {
LibDispatchTaskRunner* self = static_cast<LibDispatchTaskRunner*>(context);
self->queue_finalized_.Signal();
}
} // namespace mac
} // namespace base
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