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88 lines
1.7 KiB
C++
88 lines
1.7 KiB
C++
/*
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* \brief Input event queue
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* \author Norman Feske
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* \date 2007-10-08
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*/
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/*
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* Copyright (C) 2007-2014 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _EVENT_QUEUE_H_
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#define _EVENT_QUEUE_H_
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#include <base/signal.h>
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#include <input/event.h>
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#include <os/ring_buffer.h>
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namespace Input { class Event_queue; };
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class Input::Event_queue
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{
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public:
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/**
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* Input event queue
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*
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* We expect the client to fetch events circa each 10ms. The PS/2 driver
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* queues up to 255 events, which should be enough. Normally, PS/2
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* generates not more than 16Kbit/s, which would correspond to ca. 66 mouse
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* events per 10ms.
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*/
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enum { QUEUE_SIZE = 512U };
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typedef Genode::Ring_buffer<Input::Event, QUEUE_SIZE> Ring_buffer;
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private:
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Ring_buffer _queue;
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bool _enabled = false;
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Genode::Signal_context_capability _sigh;
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public:
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typedef Ring_buffer::Overflow Overflow;
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void enabled(bool enabled) { _enabled = enabled; }
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bool enabled() const { return _enabled; }
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void sigh(Genode::Signal_context_capability sigh) { _sigh = sigh; }
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void submit_signal()
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{
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if (_sigh.valid())
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Genode::Signal_transmitter(_sigh).submit();
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}
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/**
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* \throw Overflow
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*/
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void add(Input::Event ev, bool submit_signal_immediately = true)
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{
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if (!_enabled)
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return;
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_queue.add(ev);
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if (submit_signal_immediately)
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submit_signal();
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}
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Input::Event get() { return _queue.get(); }
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bool empty() const { return _queue.empty(); }
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int avail_capacity() const { return _queue.avail_capacity(); }
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void reset() { _queue.reset(); }
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};
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#endif /* _EVENT_QUEUE_H_ */
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