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4254cb04e1
Instead of using msleep to sleep periodically, and then increase jiffies counter in the alarm scheduler implementation of the timed semaphore use the 'trigger_periodic' call introduced by the change of the timer session interface into an asynchronous one. Thereby, we can reduce the necessary IPC communication with the timer service effectively. Ref #35
83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
/*
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* \brief Timer session interface
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* \author Norman Feske
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* \author Markus Partheymueller
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* \date 2006-08-15
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*/
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/*
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* Copyright (C) 2006-2013 Genode Labs GmbH
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* Copyright (C) 2012 Intel Corporation
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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__TIMER_SESSION__TIMER_SESSION_H_
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#define _INCLUDE__TIMER_SESSION__TIMER_SESSION_H_
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#include <base/signal.h>
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#include <session/session.h>
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namespace Timer {
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using namespace Genode;
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struct Session : Genode::Session
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{
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static const char *service_name() { return "Timer"; }
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virtual ~Session() { }
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/**
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* Program single timeout (relative from now in microseconds)
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*/
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virtual void trigger_once(unsigned us) = 0;
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/**
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* Program periodic timeout (in microseconds)
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*
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* The first period will be triggered after 'us' at the latest,
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* but it might be triggered earlier as well.
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*/
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virtual void trigger_periodic(unsigned us) = 0;
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/**
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* Register timeout signal handler
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*/
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virtual void sigh(Signal_context_capability sigh) = 0;
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/**
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* Return number of elapsed milliseconds since session creation
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*/
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virtual unsigned long elapsed_ms() const = 0;
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/**
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* Client-side convenience function for sleeping the specified number
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* of milliseconds
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*/
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virtual void msleep(unsigned ms) = 0;
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/**
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* Client-side convenience function for sleeping the specified number
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* of microseconds
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*/
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virtual void usleep(unsigned us) = 0;
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/*********************
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** RPC declaration **
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*********************/
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GENODE_RPC(Rpc_trigger_once, void, trigger_once, unsigned);
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GENODE_RPC(Rpc_trigger_periodic, void, trigger_periodic, unsigned);
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GENODE_RPC(Rpc_sigh, void, sigh, Genode::Signal_context_capability);
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GENODE_RPC(Rpc_elapsed_ms, unsigned long, elapsed_ms);
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GENODE_RPC_INTERFACE(Rpc_trigger_once, Rpc_trigger_periodic,
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Rpc_sigh, Rpc_elapsed_ms);
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};
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}
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#endif /* _INCLUDE__TIMER_SESSION__TIMER_SESSION_H_ */
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