4d442bca30
This patch reduces the number of exception types by facilitating globally defined exceptions for common usage patterns shared by most services. In particular, RPC functions that demand a session-resource upgrade not longer reflect this condition via a session-specific exception but via the 'Out_of_ram' or 'Out_of_caps' types. Furthermore, the 'Parent::Service_denied', 'Parent::Unavailable', 'Root::Invalid_args', 'Root::Unavailable', 'Service::Invalid_args', 'Service::Unavailable', and 'Local_service::Factory::Denied' types have been replaced by the single 'Service_denied' exception type defined in 'session/session.h'. This consolidation eases the error handling (there are fewer exceptions to handle), alleviates the need to convert exceptions along the session-creation call chain, and avoids possible aliasing problems (catching the wrong type with the same name but living in a different scope).
110 lines
2.4 KiB
C++
110 lines
2.4 KiB
C++
/*
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* \brief RM session interface
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* \author Norman Feske
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* \date 2016-04-15
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*/
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/*
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* Copyright (C) 2016-2017 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 Affero General Public License version 3.
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*/
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#ifndef _CORE__INCLUDE__RM_SESSION_COMPONENT_H_
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#define _CORE__INCLUDE__RM_SESSION_COMPONENT_H_
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/* Genode includes */
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#include <base/allocator_guard.h>
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#include <base/rpc_server.h>
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#include <rm_session/rm_session.h>
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/* core includes */
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#include <region_map_component.h>
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namespace Genode { class Rm_session_component; }
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class Genode::Rm_session_component : public Rpc_object<Rm_session>
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{
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private:
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Rpc_entrypoint &_ep;
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Allocator_guard _md_alloc;
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Pager_entrypoint &_pager_ep;
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Lock _region_maps_lock;
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List<Region_map_component> _region_maps;
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public:
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/**
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* Constructor
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*/
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Rm_session_component(Rpc_entrypoint &ep,
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Allocator &md_alloc,
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Pager_entrypoint &pager_ep,
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size_t ram_quota)
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:
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_ep(ep), _md_alloc(&md_alloc, ram_quota), _pager_ep(pager_ep)
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{ }
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~Rm_session_component()
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{
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Lock::Guard guard(_region_maps_lock);
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while (Region_map_component *rmc = _region_maps.first()) {
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_region_maps.remove(rmc);
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Genode::destroy(_md_alloc, rmc);
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}
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}
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/**
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* Register quota donation at allocator guard
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*/
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void upgrade_ram_quota(size_t ram_quota) { _md_alloc.upgrade(ram_quota); }
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/**************************
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** Rm_session interface **
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**************************/
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Capability<Region_map> create(size_t size) override
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{
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Lock::Guard guard(_region_maps_lock);
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try {
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Region_map_component *rm =
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new (_md_alloc)
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Region_map_component(_ep, _md_alloc, _pager_ep, 0, size);
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_region_maps.insert(rm);
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return rm->cap();
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}
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catch (Allocator::Out_of_memory) { throw Out_of_ram(); }
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}
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void destroy(Capability<Region_map> cap) override
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{
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Lock::Guard guard(_region_maps_lock);
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Region_map_component *rm = nullptr;
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_ep.apply(cap, [&] (Region_map_component *rmc) {
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if (!rmc) {
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warning("could not look up region map to destruct");
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return;
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}
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_region_maps.remove(rmc);
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rm = rmc;
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});
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if (rm)
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Genode::destroy(_md_alloc, rm);
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}
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};
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#endif /* _CORE__INCLUDE__RM_SESSION_COMPONENT_H_ */
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