82f014aa0b
BUG=1669 R=andrew@webrtc.org, fischman@webrtc.org, niklas.enbom@webrtc.org Review URL: https://webrtc-codereview.appspot.com/2032004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4719 4adac7df-926f-26a2-2b94-8c16560cd09d
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_LOW_LATENCY_EVENT_H_
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#define WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_LOW_LATENCY_EVENT_H_
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#include <errno.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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namespace webrtc {
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// Implementation of event for single waiter, single signal threads. Event
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// is sticky.
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class LowLatencyEvent {
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public:
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LowLatencyEvent();
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~LowLatencyEvent();
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// Readies the event. Must be called before signaling or waiting for event.
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// Returns true on success.
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bool Start();
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// Shuts down the event and releases threads calling WaitOnEvent. Once
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// stopped SignalEvent and WaitOnEvent will have no effect. Start can be
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// called to re-enable the event.
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// Returns true on success.
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bool Stop();
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// Releases thread calling WaitOnEvent in a sticky fashion.
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void SignalEvent(int event_id, int event_msg);
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// Waits until SignalEvent or Stop is called.
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void WaitOnEvent(int* event_id, int* event_msg);
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private:
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typedef int Handle;
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static const Handle kInvalidHandle;
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static const int kReadHandle;
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static const int kWriteHandle;
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// Closes the handle. Returns true on success.
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static bool Close(Handle* handle);
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// SignalEvent and WaitOnEvent are actually read/write to file descriptors.
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// Write is signal.
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void WriteFd(int message_id, int message);
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// Read is wait.
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void ReadFd(int* message_id, int* message);
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Handle handles_[2];
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_LOW_LATENCY_EVENT_H_
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