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49 lines
1.8 KiB
C++
49 lines
1.8 KiB
C++
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// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/mac/dispatch_source_mach.h"
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namespace base {
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DispatchSourceMach::DispatchSourceMach(const char* name,
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mach_port_t port,
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void (^event_handler)())
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// TODO(rsesek): Specify DISPATCH_QUEUE_SERIAL, in the 10.7 SDK. NULL
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// means the same thing but is not symbolically clear.
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: DispatchSourceMach(dispatch_queue_create(name, NULL),
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port,
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event_handler) {
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// Since the queue was created above in the delegated constructor, and it was
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// subsequently retained, release it here.
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dispatch_release(queue_);
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}
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DispatchSourceMach::DispatchSourceMach(dispatch_queue_t queue,
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mach_port_t port,
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void (^event_handler)())
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: queue_(queue, base::scoped_policy::RETAIN),
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source_(dispatch_source_create(DISPATCH_SOURCE_TYPE_MACH_RECV,
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port, 0, queue_)),
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source_canceled_(dispatch_semaphore_create(0)) {
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dispatch_source_set_event_handler(source_, event_handler);
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dispatch_source_set_cancel_handler(source_, ^{
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dispatch_semaphore_signal(source_canceled_);
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});
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}
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DispatchSourceMach::~DispatchSourceMach() {
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// Cancel the source and wait for the semaphore to be signaled. This will
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// ensure the source managed by this class is not used after it is freed.
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dispatch_source_cancel(source_);
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source_.reset();
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dispatch_semaphore_wait(source_canceled_, DISPATCH_TIME_FOREVER);
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}
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void DispatchSourceMach::Resume() {
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dispatch_resume(source_);
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}
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} // namespace base
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