111 lines
3.0 KiB
C++
111 lines
3.0 KiB
C++
/*
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* \brief Implementation of the SIGNAL interface
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* \author Alexander Boettcher
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* \date 2015-03-04
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*/
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/*
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* Copyright (C) 2015 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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/* Genode includes */
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#include <base/printf.h>
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/* core includes */
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#include <signal_session_component.h>
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using namespace Genode;
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/******************************
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** Signal-session component **
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******************************/
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Signal_session_component::Signal_session_component(Rpc_entrypoint *source_ep,
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Rpc_entrypoint *context_ep,
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Allocator *context_md_alloc,
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size_t ram_quota)
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:
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_source_ep(source_ep),
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_source(source_ep),
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_source_cap(_source_ep->manage(&_source)),
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_md_alloc(context_md_alloc, ram_quota),
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_contexts_slab(&_md_alloc)
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{ }
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Signal_session_component::~Signal_session_component()
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{
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/* remove _signal_source from entrypoint */
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_source_ep->dissolve(&_source);
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/* free all signal contexts */
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while (Signal_context_component *r = _contexts_slab.first_object())
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free_context(reinterpret_cap_cast<Signal_context>(Native_capability(r->cap())));
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}
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Signal_source_capability Signal_session_component::signal_source()
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{
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return _source_cap;
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}
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extern "C" Genode::addr_t __core_pd_sel;
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Signal_context_capability Signal_session_component::alloc_context(long imprint)
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{
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Native_capability sm = _source._blocking_semaphore;
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if (!sm.valid()) {
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PWRN("signal receiver sm is not valid");
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return Signal_context_capability();
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}
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Native_capability si(cap_map()->insert());
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Signal_context_capability cap = reinterpret_cap_cast<Signal_context>(si);
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uint8_t res = Nova::create_si(cap.local_name(), __core_pd_sel, imprint,
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sm.local_name());
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if (res != Nova::NOVA_OK) {
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PWRN("creating signal failed - error %u", res);
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return Signal_context_capability();
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}
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try {
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_signal_queue.insert(new (&_contexts_slab) Signal_context_component(cap));
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} catch (Allocator::Out_of_memory) {
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throw Out_of_metadata();
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}
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/* return unique capability for the signal context */
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return cap;
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}
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void Signal_session_component::free_context(Signal_context_capability context_cap)
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{
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Signal_context_component * context =
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dynamic_cast<Signal_context_component *>(_signal_queue.lookup_and_lock(context_cap.local_name()));
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if (!context) {
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PWRN("%p - specified signal-context capability has wrong type %lx",
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this, context_cap.local_name());
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return;
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}
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_signal_queue.remove_locked(context);
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destroy(&_contexts_slab, context);
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Nova::revoke(Nova::Obj_crd(context_cap.local_name(), 0));
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cap_map()->remove(context_cap.local_name(), 0);
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}
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void Signal_session_component::submit(Signal_context_capability context_cap,
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unsigned cnt)
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{
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PDBG("should not be called");
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}
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