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As timer sessions are not expected to be microseconds precise (because of RPC latency and scheduling), the session interface provided only a method 'elapsed_ms' although the back end of this method in the timer driver works with microseconds. However, in some cases it makes sense to have a method 'elapsed_us'. The values it returns might be milliseconds away from the "real" time but it allows you to work with delays smaller than a millisecond without getting a zero delta value. This commit is motivated by the need for fast bursts of calibration steps for the time interpolation in the new timer connection. Ref #2400
42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
/*
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* \brief Client-side timer session interface
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* \author Norman Feske
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* \author Markus Partheymueller
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* \date 2006-05-31
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*/
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/*
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* Copyright (C) 2006-2017 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 Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__TIMER_SESSION__CLIENT_H_
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#define _INCLUDE__TIMER_SESSION__CLIENT_H_
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#include <timer_session/capability.h>
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#include <base/rpc_client.h>
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namespace Timer { struct Session_client; }
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struct Timer::Session_client : Genode::Rpc_client<Session>
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{
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explicit Session_client(Session_capability session)
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: Genode::Rpc_client<Session>(session) { }
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void trigger_once(unsigned us) override { call<Rpc_trigger_once>(us); }
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void trigger_periodic(unsigned us) override { call<Rpc_trigger_periodic>(us); }
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void sigh(Signal_context_capability sigh) override { call<Rpc_sigh>(sigh); }
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unsigned long elapsed_ms() const override { return call<Rpc_elapsed_ms>(); }
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unsigned long elapsed_us() const override { return call<Rpc_elapsed_us>(); }
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};
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#endif /* _INCLUDE__TIMER_SESSION__CLIENT_H_ */
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