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59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
// 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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#ifndef BASE_MAC_DISPATCH_SOURCE_MACH_H_
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#define BASE_MAC_DISPATCH_SOURCE_MACH_H_
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#include <dispatch/dispatch.h>
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#include "base/base_export.h"
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#include "base/mac/scoped_dispatch_object.h"
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#include "base/macros.h"
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namespace base {
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// This class encapsulates a MACH_RECV dispatch source. When this object is
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// destroyed, the source will be cancelled and it will wait for the source
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// to stop executing work. The source can run on either a user-supplied queue,
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// or it can create its own for the source.
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class BASE_EXPORT DispatchSourceMach {
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public:
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// Creates a new dispatch source for the |port| and schedules it on a new
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// queue that will be created with |name|. When a Mach message is received,
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// the |event_handler| will be called.
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DispatchSourceMach(const char* name,
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mach_port_t port,
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void (^event_handler)());
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// Creates a new dispatch source with the same semantics as above, but rather
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// than creating a new queue, it schedules the source on |queue|.
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DispatchSourceMach(dispatch_queue_t queue,
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mach_port_t port,
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void (^event_handler)());
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// Cancels the source and waits for it to become fully cancelled before
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// releasing the source.
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~DispatchSourceMach();
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// Resumes the source. This must be called before any Mach messages will
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// be received.
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void Resume();
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private:
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// The dispatch queue used to service the source_.
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ScopedDispatchObject<dispatch_queue_t> queue_;
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// A MACH_RECV dispatch source.
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ScopedDispatchObject<dispatch_source_t> source_;
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// Semaphore used to wait on the |source_|'s cancellation in the destructor.
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ScopedDispatchObject<dispatch_semaphore_t> source_canceled_;
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DISALLOW_COPY_AND_ASSIGN(DispatchSourceMach);
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};
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} // namespace base
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#endif // BASE_MAC_DISPATCH_SOURCE_MACH_H_
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