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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.
#ifndef BASE_MAC_DISPATCH_SOURCE_MACH_H_
#define BASE_MAC_DISPATCH_SOURCE_MACH_H_
#include <dispatch/dispatch.h>
#include "base/base_export.h"
#include "base/macros.h"
namespace base {
// This class encapsulates a MACH_RECV dispatch source. When this object is
// destroyed, the source will be cancelled and it will wait for the source
// to stop executing work. The source can run on either a user-supplied queue,
// or it can create its own for the source.
class BASE_EXPORT DispatchSourceMach {
public:
// Creates a new dispatch source for the |port| and schedules it on a new
// queue that will be created with |name|. When a Mach message is received,
// the |event_handler| will be called.
DispatchSourceMach(const char* name,
mach_port_t port,
void (^event_handler)());
// Creates a new dispatch source with the same semantics as above, but rather
// than creating a new queue, it schedules the source on |queue|.
DispatchSourceMach(dispatch_queue_t queue,
mach_port_t port,
void (^event_handler)());
// Cancels the source and waits for it to become fully cancelled before
// releasing the source.
~DispatchSourceMach();
// Resumes the source. This must be called before any Mach messages will
// be received.
void Resume();
private:
// Cancels the source, after which this class will no longer receive Mach
// messages. Calling this more than once is a no-op.
void Cancel();
// The dispatch queue used to service the source_.
dispatch_queue_t queue_;
// A MACH_RECV dispatch source.
dispatch_source_t source_;
// Semaphore used to wait on the |source_|'s cancellation in the destructor.
dispatch_semaphore_t source_canceled_;
DISALLOW_COPY_AND_ASSIGN(DispatchSourceMach);
};
} // namespace base
#endif // BASE_MAC_DISPATCH_SOURCE_MACH_H_
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