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92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
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/*
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* \brief Fiasco.OC-specific signal-source client interface
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* \author Norman Feske
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* \author Stefan Kalkowski
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* \date 2010-02-03
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*
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* On Fiasco.OC, the signal source server does not provide a blocking
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* 'wait_for_signal' function because this kernel does no support
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* out-of-order IPC replies. Instead, we use an IRQ kernel-object
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* to let the client block until a signal is present at the
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* server. The IRQ object gets initialized with the first
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* call of 'wait_for_signal()'.
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*/
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/*
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* Copyright (C) 2010-2011 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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#ifndef _INCLUDE__SIGNAL_SESSION__SOURCE_CLIENT_H_
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#define _INCLUDE__SIGNAL_SESSION__SOURCE_CLIENT_H_
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#include <base/rpc_client.h>
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#include <base/thread.h>
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#include <signal_session/foc_source.h>
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namespace Fiasco {
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#include <l4/sys/irq.h>
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}
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namespace Genode {
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class Signal_source_client : public Rpc_client<Foc_signal_source>
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{
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private:
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/**
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* Capability with 'dst' referring to a Fiasco.OC IRQ object
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*/
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Native_capability _sem;
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/**
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* Request Fiasco.OC IRQ object from signal-source server
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*/
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void _init_sem()
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{
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using namespace Fiasco;
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/* request mapping of semaphore capability selector */
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_sem = call<Rpc_request_semaphore>();
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l4_msgtag_t tag = l4_irq_attach(_sem.dst(), 0,
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Thread_base::myself()->tid());
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if (l4_error(tag))
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PERR("l4_irq_attach failed with %ld!", l4_error(tag));
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}
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public:
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/**
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* Constructor
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*/
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Signal_source_client(Signal_source_capability cap)
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: Rpc_client<Foc_signal_source>(static_cap_cast<Foc_signal_source>(cap))
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{ _init_sem(); }
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/*****************************
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** Signal source interface **
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*****************************/
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Signal wait_for_signal()
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{
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using namespace Fiasco;
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/* block on semaphore, will be unblocked if signal is available */
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l4_irq_receive(_sem.dst(), L4_IPC_NEVER);
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/*
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* Now that the server has unblocked the semaphore, we are sure
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* that there is a signal pending. The following 'wait_for_signal'
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* request will be immediately answered.
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*/
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return call<Rpc_wait_for_signal>();
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}
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};
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}
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#endif /* _INCLUDE__SIGNAL_SESSION__SOURCE_CLIENT_H_ */
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