95 lines
2.2 KiB
C++
95 lines
2.2 KiB
C++
/*
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* \brief Implementation of the SIGNAL interface
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* \author Norman Feske
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* \author Stefan Kalkowski
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* \date 2009-08-11
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*/
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/*
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* Copyright (C) 2009-2017 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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/* Genode includes */
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#include <base/log.h>
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#include <base/native_capability.h>
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/* core includes */
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#include <platform.h>
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#include <signal_source_component.h>
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namespace Fiasco {
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#include <l4/sys/factory.h>
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#include <l4/sys/irq.h>
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}
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using namespace Genode;
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/*****************************
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** Signal-source component **
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*****************************/
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void Signal_source_component::release(Signal_context_component &context)
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{
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if (context.enqueued())
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_signal_queue.remove(context);
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}
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void Signal_source_component::submit(Signal_context_component &context,
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unsigned long cnt)
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{
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/* enqueue signal to context */
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context.increment_signal_cnt(cnt);
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if (!context.enqueued()) {
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_signal_queue.enqueue(context);
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/* wake up client */
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Fiasco::l4_irq_trigger(_blocking_semaphore.data()->kcap());
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}
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}
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Signal_source::Signal Signal_source_component::wait_for_signal()
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{
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if (_signal_queue.empty()) {
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warning("unexpected call of wait_for_signal");
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return Signal(0, 0);
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}
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/* dequeue and return pending signal */
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Signal result { };
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_signal_queue.dequeue([&result] (Signal_context_component &context) {
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result = Signal(context.imprint(), context.cnt());
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context.reset_signal_cnt();
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});
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return result;
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}
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Signal_source_component::Signal_source_component(Rpc_entrypoint &ep)
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:
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Signal_source_rpc_object(cap_map().insert(platform_specific().cap_id_alloc().alloc())),
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_entrypoint(ep)
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{
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using namespace Fiasco;
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l4_msgtag_t res = l4_factory_create_irq(L4_BASE_FACTORY_CAP,
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_blocking_semaphore.data()->kcap());
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if (l4_error(res))
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error("Allocation of irq object failed!");
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}
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Signal_source_component::~Signal_source_component()
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{
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/*
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* On Fiasco.OC, the signal-source client does not use a blocking call
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* to wait for signals. Hence, we do not need to take care of
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* releasing the reply capability of such a call.
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*/
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}
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