106 lines
2.3 KiB
C++
106 lines
2.3 KiB
C++
/*
|
|
* \brief Implementation of the SIGNAL interface
|
|
* \author Norman Feske
|
|
* \date 2009-08-11
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2009-2017 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
/* Genode includes */
|
|
#include <base/ipc.h>
|
|
|
|
/* core includes */
|
|
#include <signal_source_component.h>
|
|
|
|
using namespace Genode;
|
|
|
|
|
|
/*****************************
|
|
** Signal-source component **
|
|
*****************************/
|
|
|
|
void Signal_source_component::release(Signal_context_component &context)
|
|
{
|
|
if (context.enqueued())
|
|
_signal_queue.remove(context);
|
|
}
|
|
|
|
|
|
void Signal_source_component::submit(Signal_context_component &context,
|
|
unsigned long cnt)
|
|
{
|
|
/*
|
|
* If the client does not block in 'wait_for_signal', the
|
|
* signal will be delivered as result of the next
|
|
* 'wait_for_signal' call.
|
|
*/
|
|
context.increment_signal_cnt(cnt);
|
|
|
|
/*
|
|
* If the client is blocking at the signal source (indicated by
|
|
* the valid reply capability), we wake him up.
|
|
*/
|
|
if (_reply_cap.valid()) {
|
|
|
|
_entrypoint.reply_signal_info(_reply_cap, context.imprint(), context.cnt());
|
|
|
|
/*
|
|
* We unblocked the client and, therefore, can invalidate
|
|
* the reply capability.
|
|
*/
|
|
_reply_cap = Untyped_capability();
|
|
context.reset_signal_cnt();
|
|
|
|
} else {
|
|
|
|
if (!context.enqueued())
|
|
_signal_queue.enqueue(context);
|
|
}
|
|
}
|
|
|
|
|
|
Signal_source::Signal Signal_source_component::wait_for_signal()
|
|
{
|
|
/* keep client blocked */
|
|
if (_signal_queue.empty()) {
|
|
|
|
/*
|
|
* Keep reply capability for outstanding request to be used
|
|
* for the later call of 'explicit_reply()'.
|
|
*/
|
|
_reply_cap = _entrypoint.reply_dst();
|
|
_entrypoint.omit_reply();
|
|
return Signal(0, 0); /* just a dummy */
|
|
}
|
|
|
|
|
|
/* dequeue and return pending signal */
|
|
Signal result { };
|
|
_signal_queue.dequeue([&result] (Signal_context_component &context) {
|
|
result = Signal(context.imprint(), context.cnt());
|
|
context.reset_signal_cnt();
|
|
});
|
|
return result;
|
|
}
|
|
|
|
|
|
Signal_source_component::Signal_source_component(Rpc_entrypoint &ep)
|
|
:
|
|
_entrypoint(ep)
|
|
{ }
|
|
|
|
|
|
Signal_source_component::~Signal_source_component()
|
|
{
|
|
if (!_reply_cap.valid())
|
|
return;
|
|
|
|
_entrypoint.reply_signal_info(_reply_cap, 0, 0);
|
|
_reply_cap = Untyped_capability();
|
|
}
|