112 lines
2.5 KiB
C++
112 lines
2.5 KiB
C++
/*
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* \brief Implementation of the SIGNAL interface
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* \author Norman Feske
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* \date 2009-08-11
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*/
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/*
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* Copyright (C) 2009-2013 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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/* Genode includes */
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#include <base/ipc.h>
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#include <base/printf.h>
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/* core includes */
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#include <signal_source_component.h>
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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 && context->is_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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/*
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* If the client does not block in 'wait_for_signal', the
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* signal will be delivered as result of the next
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* 'wait_for_signal' call.
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*/
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context->increment_signal_cnt(cnt);
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/*
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* If the client is blocking at the signal source (indicated by
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* the valid reply capability), we wake him up.
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*/
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if (_reply_cap.valid()) {
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_entrypoint->reply_signal_info(_reply_cap, context->imprint(), context->cnt());
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/*
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* We unblocked the client and, therefore, can invalidate
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* the reply capability.
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*/
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_reply_cap = Untyped_capability();
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context->reset_signal_cnt();
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} else {
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if (!context->is_enqueued())
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_signal_queue.enqueue(context);
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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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/* keep client blocked */
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if (_signal_queue.empty()) {
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/*
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* Keep reply capability for outstanding request to be used
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* for the later call of 'explicit_reply()'.
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*/
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_reply_cap = _entrypoint->reply_dst();
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_entrypoint->omit_reply();
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return Signal(0, 0); /* just a dummy */
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}
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/* dequeue and return pending signal */
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Signal_context_component *context = _signal_queue.dequeue();
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Signal result(context->imprint(), context->cnt());
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context->reset_signal_cnt();
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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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_entrypoint(ep), _finalizer(*this),
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_finalizer_cap(_entrypoint->manage(&_finalizer))
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{ }
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Signal_source_component::~Signal_source_component()
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{
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_finalizer_cap.call<Finalizer::Rpc_exit>();
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_entrypoint->dissolve(&_finalizer);
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}
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void Signal_source_component::Finalizer_component::exit()
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{
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if (!source._reply_cap.valid())
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return;
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source._entrypoint->reply_signal_info(source._reply_cap, 0, 0);
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source._reply_cap = Untyped_capability();
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}
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