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a7b3072cc2
This patch supplements each existing connection type with an new constructor that is meant to replace the original one. The new one takes a reference to the component's environment as argument and thereby does not rely on the presence of the globally accessible 'env()' interface. The original constructors are marked as deprecated. Once we have completely abolished the use of the global 'env()', we will remove them. Fixes #1960
113 lines
2.7 KiB
C++
113 lines
2.7 KiB
C++
/*
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* \brief Connection to timer service
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* \author Norman Feske
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* \date 2008-08-22
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*/
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/*
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* Copyright (C) 2008-2013 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__TIMER_SESSION__CONNECTION_H_
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#define _INCLUDE__TIMER_SESSION__CONNECTION_H_
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#include <timer_session/client.h>
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#include <base/connection.h>
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namespace Timer { class Connection; }
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class Timer::Connection : public Genode::Connection<Session>, public Session_client
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{
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private:
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Genode::Lock _lock;
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Genode::Signal_receiver _sig_rec;
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Genode::Signal_context _default_sigh_ctx;
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Genode::Signal_context_capability
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_default_sigh_cap = _sig_rec.manage(&_default_sigh_ctx);
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Genode::Signal_context_capability _custom_sigh_cap;
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public:
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/**
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* Constructor
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*/
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Connection(Genode::Env &env)
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:
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Genode::Connection<Session>(env, session(env.parent(), "ram_quota=8K")),
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Session_client(cap())
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{
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/* register default signal handler */
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Session_client::sigh(_default_sigh_cap);
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}
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/**
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* Constructor
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*
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* \noapi
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* \deprecated Use the constructor with 'Env &' as first
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* argument instead
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*/
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Connection()
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:
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Genode::Connection<Session>(session("ram_quota=8K")),
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Session_client(cap())
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{
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/* register default signal handler */
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Session_client::sigh(_default_sigh_cap);
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}
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~Connection() { _sig_rec.dissolve(&_default_sigh_ctx); }
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/*
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* Intercept 'sigh' to keep track of customized signal handlers
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*/
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void sigh(Signal_context_capability sigh)
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{
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_custom_sigh_cap = sigh;
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Session_client::sigh(_custom_sigh_cap);
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}
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void usleep(unsigned us)
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{
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/*
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* Omit the interaction with the timer driver for the corner case
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* of not sleeping at all. This corner case may be triggered when
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* polling is combined with sleeping (as some device drivers do).
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* If we passed the sleep operation to the timer driver, the
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* timer would apply its policy about a minimum sleep time to
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* the sleep operation, which is not desired when polling.
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*/
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if (us == 0)
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return;
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/* serialize sleep calls issued by different threads */
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Genode::Lock::Guard guard(_lock);
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/* temporarily install to the default signal handler */
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if (_custom_sigh_cap.valid())
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Session_client::sigh(_default_sigh_cap);
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/* trigger timeout at default signal handler */
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trigger_once(us);
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_sig_rec.wait_for_signal();
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/* revert custom signal handler if registered */
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if (_custom_sigh_cap.valid())
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Session_client::sigh(_custom_sigh_cap);
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}
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void msleep(unsigned ms)
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{
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usleep(1000*ms);
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}
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};
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#endif /* _INCLUDE__TIMER_SESSION__CONNECTION_H_ */
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