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'Root::Unavailable', 'Service::Invalid_args', 'Service::Unavailable', and 'Local_service::Factory::Denied' types have been replaced by the single 'Service_denied' exception type defined in 'session/session.h'.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).
166 lines
3.7 KiB
C++
166 lines
3.7 KiB
C++
/*
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* \brief TRACE session implementation
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* \author Norman Feske
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* \date 2013-08-12
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*/
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/*
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* Copyright (C) 2013-2017 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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/* core-internal includes */
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#include <trace/session_component.h>
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#include <dataspace/capability.h>
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#include <base/rpc_client.h>
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using namespace Genode;
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using namespace Genode::Trace;
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Dataspace_capability Session_component::dataspace()
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{
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return _argument_buffer.ds;
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}
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size_t Session_component::subjects()
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{
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_subjects.import_new_sources(_sources);
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return _subjects.subjects((Subject_id *)_argument_buffer.base,
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_argument_buffer.size/sizeof(Subject_id));
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}
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Policy_id Session_component::alloc_policy(size_t size)
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{
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if (size > _argument_buffer.size)
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throw Policy_too_large();
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/*
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* Using prefix incrementation makes sure a policy with id == 0 is
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* invalid.
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*/
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Policy_id const id(++_policy_cnt);
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if (!_md_alloc.withdraw(size))
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throw Out_of_ram();
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try {
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Ram_dataspace_capability ds = _ram.alloc(size);
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_policies.insert(*this, id, _policies_slab, ds, size);
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} catch (...) {
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/* revert withdrawal or quota */
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_md_alloc.upgrade(size);
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throw Out_of_ram();
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}
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return id;
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}
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Dataspace_capability Session_component::policy(Policy_id id)
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{
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return _policies.dataspace(*this, id);
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}
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void Session_component::unload_policy(Policy_id id)
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{
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_policies.remove(*this, id);
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}
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void Session_component::trace(Subject_id subject_id, Policy_id policy_id,
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size_t buffer_size)
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{
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size_t const policy_size = _policies.size(*this, policy_id);
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size_t const required_ram = buffer_size + policy_size;
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/*
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* Account RAM needed for trace buffer and policy buffer to the trace
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* session.
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*/
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if (!_md_alloc.withdraw(required_ram))
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throw Out_of_ram();
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try {
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Trace::Subject *subject = _subjects.lookup_by_id(subject_id);
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subject->trace(policy_id, _policies.dataspace(*this, policy_id),
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policy_size, _ram, buffer_size);
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} catch (...) {
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/* revert withdrawal or quota */
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_md_alloc.upgrade(required_ram);
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throw Out_of_ram();
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}
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}
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void Session_component::rule(Session_label const &, Thread_name const &,
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Policy_id, size_t)
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{
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/* not implemented yet */
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}
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void Session_component::pause(Subject_id subject_id)
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{
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_subjects.lookup_by_id(subject_id)->pause();
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}
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void Session_component::resume(Subject_id subject_id)
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{
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_subjects.lookup_by_id(subject_id)->resume();
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}
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Subject_info Session_component::subject_info(Subject_id subject_id)
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{
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return _subjects.lookup_by_id(subject_id)->info();
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}
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Dataspace_capability Session_component::buffer(Subject_id subject_id)
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{
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return _subjects.lookup_by_id(subject_id)->buffer();
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}
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void Session_component::free(Subject_id subject_id)
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{
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size_t released_ram = _subjects.lookup_by_id(subject_id)->release();
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_md_alloc.upgrade(released_ram);
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}
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Session_component::Session_component(Allocator &md_alloc, size_t ram_quota,
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size_t arg_buffer_size, unsigned parent_levels,
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char const *label, Source_registry &sources,
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Policy_registry &policies)
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:
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_ram(*env_deprecated()->ram_session()),
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_md_alloc(&md_alloc, ram_quota),
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_subjects_slab(&_md_alloc),
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_policies_slab(&_md_alloc),
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_parent_levels(parent_levels),
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_label(label),
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_sources(sources),
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_policies(policies),
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_subjects(_subjects_slab, _ram, _sources),
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_argument_buffer(_ram, arg_buffer_size)
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{
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_md_alloc.withdraw(_argument_buffer.size);
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}
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Session_component::~Session_component()
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{
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_policies.destroy_policies_owned_by(*this);
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}
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