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0ed68a56b7
This patch changes both the Input::Session interface and the skeleton
for the server-side implementation of this interface
('input/component.h').
The Input::Session interface offers a new 'sigh' function, which can be
called be the client to register a signal handler. The signal handler
gets notified on the arrival of new input. This alleviates the need to
poll for input events at the client side.
The server-side skeleton for implementing input services underwent a
redesign to make it more modular and robust. I.e., there are no
global functions needed at the server side and the event-queue
enable/disable mechanism is implemented at a central place (in the root
component) rather than inside each driver.
Fixes #46
78 lines
1.8 KiB
C++
78 lines
1.8 KiB
C++
/*
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* \brief Frontend of input service
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* \author Norman Feske
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* \date 2006-08-16
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*/
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/*
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* Copyright (C) 2006-2013 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 _INCLUDE__INPUT__COMPONENT_H_
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#define _INCLUDE__INPUT__COMPONENT_H_
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#include <base/env.h>
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#include <base/rpc_server.h>
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#include <os/attached_ram_dataspace.h>
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#include <os/ring_buffer.h>
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#include <root/component.h>
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#include <input_session/input_session.h>
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#include <input/event_queue.h>
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namespace Input { class Session_component; }
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class Input::Session_component : public Genode::Rpc_object<Input::Session>
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{
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private:
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Genode::Attached_ram_dataspace _ds { Genode::env()->ram_session(),
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Event_queue::QUEUE_SIZE*sizeof(Input::Event) };
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Event_queue _event_queue;
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public:
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/**
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* Return reference to event queue of the session
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*/
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Event_queue &event_queue() { return _event_queue; }
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/**
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* Submit input event to event queue
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*
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* \throw Input::Event_queue::Overflow
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*/
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void submit(Input::Event event) { _event_queue.add(event); }
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/******************************
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** Input::Session interface **
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******************************/
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Genode::Dataspace_capability dataspace() override { return _ds.cap(); }
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bool is_pending() const override { return !_event_queue.empty(); }
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int flush() override
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{
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Input::Event *dst = _ds.local_addr<Input::Event>();
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unsigned cnt = 0;
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for (; cnt < Event_queue::QUEUE_SIZE && !_event_queue.empty(); cnt++)
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*dst++ = _event_queue.get();
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return cnt;
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}
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void sigh(Genode::Signal_context_capability sigh) override
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{
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_event_queue.sigh(sigh);
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}
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};
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#endif /* _INCLUDE__INPUT__COMPONENT_H_ */
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