genode/os/src/drivers/input/ps2/event_queue.h

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2011-12-22 15:19:25 +00:00
/*
* \brief Input event queue
* \author Norman Feske
* \date 2007-10-08
*/
/*
2012-01-03 14:35:05 +00:00
* Copyright (C) 2007-2012 Genode Labs GmbH
2011-12-22 15:19:25 +00:00
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _EVENT_QUEUE_H_
#define _EVENT_QUEUE_H_
#include <input/event.h>
#include <os/ring_buffer.h>
/**
* Input event queue
*
* We expect the client to fetch events circa each 10ms. The PS/2 driver queues
* up to 255 events, which should be enough. Normally, PS/2 generates not more
* than 16Kbit/s, which would correspond to ca. 66 mouse events per 10ms.
*/
class Event_queue
{
private:
bool _enabled;
Ring_buffer<Input::Event, 512> _ev_queue;
public:
Event_queue() : _enabled(false), _ev_queue() { }
void enable() { _enabled = true; }
void disable() { _enabled = false; }
void add(Input::Event e)
{
if (!_enabled) return;
try {
_ev_queue.add(e);
} catch (Ring_buffer<Input::Event, 512>::Overflow) {
PWRN("event buffer overflow");
}
}
Input::Event get()
{
if (_enabled)
return _ev_queue.get();
else
return Input::Event();
}
bool empty()
{
if (_enabled)
return _ev_queue.empty();
else
return true;
}
};
#endif /* _EVENT_QUEUE_H_ */