fe19103546
The 'pause' call on base-nova assumes that a thread can solely block in its associated semaphore. Main reason is that so core can unblock a thread in order that the recall exception gets delivered and the register state can be obtained. Unfortunately the signal session implementation creates a semaphore, which is unknown by the pager code. Instead create the semaphore via the pager of the thread, so that the pager can unblock the signal thread when a pause is issued. Issue #478
92 lines
2.1 KiB
C++
92 lines
2.1 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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#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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#include <platform_pd.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::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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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.local_name(), 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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:
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_entrypoint(ep), _finalizer(*this),
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_finalizer_cap(_entrypoint->manage(&_finalizer)) { }
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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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/*
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* On NOVA, 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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