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// Copyright 2014 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/dispatch_source_mach.h"
namespace base {
DispatchSourceMach::DispatchSourceMach(const char* name,
mach_port_t port,
void (^event_handler)())
// TODO(rsesek): Specify DISPATCH_QUEUE_SERIAL, in the 10.7 SDK. NULL
// means the same thing but is not symbolically clear.
: DispatchSourceMach(dispatch_queue_create(name, NULL),
port,
event_handler) {
// Since the queue was created above in the delegated constructor, and it was
// subsequently retained, release it here.
dispatch_release(queue_);
}
DispatchSourceMach::DispatchSourceMach(dispatch_queue_t queue,
mach_port_t port,
void (^event_handler)())
: queue_(queue),
source_(dispatch_source_create(DISPATCH_SOURCE_TYPE_MACH_RECV,
port, 0, queue_)),
source_canceled_(dispatch_semaphore_create(0)) {
dispatch_retain(queue);
dispatch_source_set_event_handler(source_, event_handler);
dispatch_source_set_cancel_handler(source_, ^{
dispatch_semaphore_signal(source_canceled_);
});
}
DispatchSourceMach::~DispatchSourceMach() {
Cancel();
}
void DispatchSourceMach::Resume() {
dispatch_resume(source_);
}
void DispatchSourceMach::Cancel() {
if (source_) {
dispatch_source_cancel(source_);
dispatch_release(source_);
source_ = NULL;
dispatch_semaphore_wait(source_canceled_, DISPATCH_TIME_FOREVER);
dispatch_release(source_canceled_);
source_canceled_ = NULL;
}
if (queue_) {
dispatch_release(queue_);
queue_ = NULL;
}
}
} // namespace base
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