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f186587cab
Besides unifying the Msgbuf_base classes across all platforms, this patch merges the Ipc_marshaller functionality into Msgbuf_base, which leads to several further simplifications. For example, this patch eventually moves the Native_connection_state and removes all state from the former Ipc_server to the actual server loop, which not only makes the flow of control and information much more obvious, but is also more flexible. I.e., on NOVA, we don't even have the notion of reply-and-wait. Now, we are no longer forced to pretend otherwise. Issue #1832
114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
/*
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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 not support out-of-order
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* IPC replies. Instead, we use an IRQ kernel-object to let the client block
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* until a signal is present at the server.
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*
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* We request the IRQ object capability and attach to the IRQ on construction
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* of the 'Signal_source_client' object.
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*/
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/*
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* Copyright (C) 2010-2013 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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#ifndef _INCLUDE__SIGNAL_SOURCE__CLIENT_H_
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#define _INCLUDE__SIGNAL_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_source/foc_signal_source.h>
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/* base-internal includes */
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#include <base/internal/native_thread.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()->native_thread().kcap);
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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(Capability<Signal_source> 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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* Destructor
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*/
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~Signal_source_client()
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{
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Fiasco::l4_irq_detach(_sem.dst());
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}
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/*****************************
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** Signal source interface **
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*****************************/
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/* Build with frame pointer to make GDB backtraces work. See issue #1061. */
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__attribute__((optimize("-fno-omit-frame-pointer")))
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__attribute__((noinline))
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Signal wait_for_signal()
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{
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using namespace Fiasco;
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Signal signal;
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do {
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/* block on semaphore until signal context was submitted */
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l4_irq_receive(_sem.dst(), L4_IPC_NEVER);
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/*
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* The following request will return immediately and either
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* return a valid or a null signal. The latter may happen in
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* the case a submitted signal context was destroyed (by the
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* submitter) before we have a chance to raise our request.
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*/
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signal = call<Rpc_wait_for_signal>();
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} while (!signal.imprint());
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return signal;
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}
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};
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}
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#endif /* _INCLUDE__SIGNAL_SOURCE__CLIENT_H_ */
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