6d837c9e26
This patch extends the 'Parent::session()' and 'Root::session()' functions with an additional 'affinity' parameter, which is inteded to express the preferred affinity of the new session. For CPU sessions provided by core, the values will be used to select the set of CPUs assigned to the CPU session. For other services, the session affinity information can be utilized to optimize the locality of the server thread with the client. For example, to enable the IRQ session to route an IRQ to the CPU core on which the corresponding device driver (the IRQ client) is running.
65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
/*
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* \brief Root component for singleton services
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* \author Norman Feske
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* \date 2012-10-05
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*
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* Many components, in particular device drivers, support only one client
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* at a time. In this case, one single session may be created right at the
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* start of the program and handed out via the 'Root::session' function.
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*/
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/*
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* Copyright (C) 2012-2013 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__OS__STATIC_ROOT_H_
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#define _INCLUDE__OS__STATIC_ROOT_H_
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/* Genode includes */
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#include <base/rpc_server.h>
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#include <session/session.h>
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#include <root/root.h>
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namespace Genode { template <typename> class Static_root; }
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/**
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* Root interface that hands out a statically created session
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*/
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template <typename SESSION>
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class Genode::Static_root : public Genode::Rpc_object<Genode::Typed_root<SESSION> >
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{
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private:
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Capability<SESSION> _session;
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public:
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/**
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* Constructor
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*
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* \param session session to be provided to the client
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*/
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Static_root(Capability<SESSION> session) : _session(session) { }
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/********************
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** Root interface **
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********************/
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Capability<Session> session(Root::Session_args const &args, Affinity const &)
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{
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return _session;
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}
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void upgrade(Capability<Session>, Root::Upgrade_args const &) { }
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void close(Capability<Session>) { }
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};
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#endif /* _INCLUDE__OS__STATIC_ROOT_H_ */
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