111 lines
2.8 KiB
C++
111 lines
2.8 KiB
C++
/*
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* \brief Mechanism to deliver signals via core
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* \author Norman Feske
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* \date 2016-01-04
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*/
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/*
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* Copyright (C) 2016 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 _CORE__INCLUDE__SIGNAL_BROKER_H_
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#define _CORE__INCLUDE__SIGNAL_BROKER_H_
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#include <signal_source_component.h>
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#include <signal_source/capability.h>
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namespace Genode { class Signal_broker; }
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class Genode::Signal_broker
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{
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private:
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Allocator &_md_alloc;
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Rpc_entrypoint &_source_ep;
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Rpc_entrypoint &_context_ep;
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Signal_source_component _source;
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Signal_source_capability _source_cap;
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Tslab<Signal_context_component,
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960*sizeof(long)> _contexts_slab { &_md_alloc };
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public:
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class Invalid_signal_source : public Exception { };
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Signal_broker(Allocator &md_alloc,
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Rpc_entrypoint &source_ep,
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Rpc_entrypoint &context_ep)
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:
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_md_alloc(md_alloc),
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_source_ep(source_ep),
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_context_ep(context_ep),
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_source(&_context_ep),
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_source_cap(_source_ep.manage(&_source))
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{ }
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~Signal_broker()
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{
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/* remove source from entrypoint */
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_source_ep.dissolve(&_source);
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/* free all signal contexts */
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while (Signal_context_component *r = _contexts_slab.first_object())
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free_context(r->cap());
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}
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Signal_source_capability alloc_signal_source() { return _source_cap; }
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void free_signal_source(Signal_source_capability) { }
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Signal_context_capability
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alloc_context(Signal_source_capability, unsigned long imprint)
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{
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/*
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* XXX For now, we ignore the signal-source argument as we
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* create only a single receiver for each PD.
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*/
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Signal_context_component *context = new (&_contexts_slab)
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Signal_context_component(imprint, &_source);
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return _context_ep.manage(context);
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}
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void free_context(Signal_context_capability context_cap)
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{
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Signal_context_component *context;
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_context_ep.apply(context_cap, [&] (Signal_context_component *c) {
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context = c;
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if (!context) {
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PWRN("specified signal-context capability has wrong type");
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return;
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}
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_context_ep.dissolve(context);
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});
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destroy(&_contexts_slab, context);
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}
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void submit(Signal_context_capability cap, unsigned cnt)
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{
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_source_ep.apply(cap, [&] (Signal_context_component *context) {
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if (!context) {
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/*
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* We do not use PWRN() to enable the build system to
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* suppress this warning in release mode (SPECS +=
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* release).
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*/
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PDBG("invalid signal-context capability");
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return;
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}
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context->source()->submit(context, cnt);
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});
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}
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};
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#endif /* _CORE__INCLUDE__SIGNAL_BROKER_H_ */
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