74 lines
1.8 KiB
C++
74 lines
1.8 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) 2009-2012 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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#include <base/cap_sel_alloc.h>
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/* core includes */
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#include <signal_session_component.h>
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/* NOVA includes */
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#include <nova/syscalls.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::submit(Signal_context_component *context,
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Ipc_ostream *ostream,
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int 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->is_enqueued()) {
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_signal_queue.enqueue(context);
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/* wake up client */
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Nova::sm_ctrl(_blocking_semaphore.tid(), Nova::SEMAPHORE_UP);
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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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PWRN("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_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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: _entrypoint(ep)
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{
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/* initialized blocking semaphore */
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int sem_sel = cap_selector_allocator()->alloc();
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int ret = Nova::create_sm(sem_sel, cap_selector_allocator()->pd_sel(), 0);
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if (ret)
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PERR("create_sm returned %d", ret);
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_blocking_semaphore = Native_capability(sem_sel, 0);
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}
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