genode/repos/os/include/input/component.h
2019-01-30 13:49:54 +01:00

93 lines
2.0 KiB
C++

/*
* \brief Frontend of input service
* \author Norman Feske
* \date 2006-08-16
*/
/*
* Copyright (C) 2006-2017 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _INCLUDE__INPUT__COMPONENT_H_
#define _INCLUDE__INPUT__COMPONENT_H_
#include <base/env.h>
#include <base/rpc_server.h>
#include <base/attached_ram_dataspace.h>
#include <os/ring_buffer.h>
#include <root/component.h>
#include <input_session/input_session.h>
#include <input/event_queue.h>
namespace Input { class Session_component; }
class Input::Session_component : public Genode::Rpc_object<Input::Session>
{
private:
Genode::Attached_ram_dataspace _ds;
Event_queue _event_queue { };
public:
/**
* Constructor
*
* \param ram allocator for the session buffer
*/
Session_component(Genode::Env &env, Genode::Ram_allocator &ram)
:
_ds(ram, env.rm(), Event_queue::QUEUE_SIZE*sizeof(Input::Event))
{ }
/**
* Return reference to event queue of the session
*/
Event_queue &event_queue() { return _event_queue; }
/**
* Submit input event to event queue
*/
void submit(Input::Event event)
{
try {
_event_queue.add(event);
} catch (Input::Event_queue::Overflow) {
Genode::warning("input overflow - resetting queue");
_event_queue.reset();
}
}
/******************************
** Input::Session interface **
******************************/
Genode::Dataspace_capability dataspace() override { return _ds.cap(); }
bool pending() const override { return !_event_queue.empty(); }
int flush() override
{
Input::Event *dst = _ds.local_addr<Input::Event>();
unsigned cnt = 0;
for (; cnt < Event_queue::QUEUE_SIZE && !_event_queue.empty(); cnt++)
*dst++ = _event_queue.get();
return cnt;
}
void sigh(Genode::Signal_context_capability sigh) override
{
_event_queue.sigh(sigh);
}
};
#endif /* _INCLUDE__INPUT__COMPONENT_H_ */