e2a13386e5
This patch adds a 'wakeup' member function to EventQueue which should be
called on an event queue whenever an event is scheduled on the event queue
from outside code within the call tree of the gem5 event loop.
This clearly isn't necessary for normal gem5 EventQueue operation but
becomes the minimum necessary interface to allow hosting gem5's event loop
onto other schedulers where there may be calls into gem5 from external
code which schedules events onto an EventQueue between the current time and
the time of the next scheduled event.
The use case I have in mind is a SystemC hosting where the event loop is:
while (more events) {
wait(time_to_next_event or wakeup)
setCurTick
service events at this time
}
where the 'wait' needs to be woken up if time_to_next_event becomes shorter
due to a scheduled event from SystemC arriving in a gem5 object.
Requiring 'wakeup' to be called is a more efficient interface than
requiring all gem5 event scheduling actions to affect the host scheduler.
This interface could be located elsewhere, say on another global object,
or by being passed by the host scheduler to objects which will schedule
such events, but it seems cleanest to put it on EventQueue as it is
actually a signal to the queue.
EventQueue::wakeup is called for async_event events on event queue 0 as
it's only important that *some* queue be triggered for such events.
148 lines
4.5 KiB
C++
148 lines
4.5 KiB
C++
/*
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* Copyright (c) 2012 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2000-2005 The Regents of The University of Michigan
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* Copyright (c) 2008 The Hewlett-Packard Development Company
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Nathan Binkert
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*/
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#include <csignal>
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#include <iostream>
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#include <string>
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#include "base/cprintf.hh"
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#include "sim/async.hh"
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#include "sim/core.hh"
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#include "sim/eventq.hh"
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#include "sim/init_signals.hh"
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using namespace std;
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/// Stats signal handler.
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void
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dumpStatsHandler(int sigtype)
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{
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async_event = true;
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async_statdump = true;
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/* Wake up some event queue to handle event */
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getEventQueue(0)->wakeup();
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}
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void
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dumprstStatsHandler(int sigtype)
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{
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async_event = true;
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async_statdump = true;
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async_statreset = true;
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/* Wake up some event queue to handle event */
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getEventQueue(0)->wakeup();
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}
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/// Exit signal handler.
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void
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exitNowHandler(int sigtype)
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{
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async_event = true;
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async_exit = true;
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/* Wake up some event queue to handle event */
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getEventQueue(0)->wakeup();
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}
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/// Abort signal handler.
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void
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abortHandler(int sigtype)
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{
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ccprintf(cerr, "Program aborted at cycle %d\n", curTick());
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}
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// Handle SIGIO
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static void
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ioHandler(int sigtype)
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{
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async_event = true;
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async_io = true;
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/* Wake up some event queue to handle event */
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getEventQueue(0)->wakeup();
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}
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static void
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installSignalHandler(int signal, void (*handler)(int sigtype))
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{
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sigemptyset(&sa.sa_mask);
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sa.sa_handler = handler;
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sa.sa_flags = SA_RESTART;
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if (sigaction(signal, &sa, NULL) == -1)
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panic("Failed to setup handler for signal %i\n", signal);
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}
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/*
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* M5 can do several special things when various signals are sent.
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* None are mandatory.
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*/
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void
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initSignals()
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{
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// Floating point exceptions may happen on misspeculated paths, so
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// ignore them
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signal(SIGFPE, SIG_IGN);
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// We use SIGTRAP sometimes for debugging
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signal(SIGTRAP, SIG_IGN);
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// Dump intermediate stats
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installSignalHandler(SIGUSR1, dumpStatsHandler);
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// Dump intermediate stats and reset them
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installSignalHandler(SIGUSR2, dumprstStatsHandler);
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// Exit cleanly on Interrupt (Ctrl-C)
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installSignalHandler(SIGINT, exitNowHandler);
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// Print out cycle number on abort
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installSignalHandler(SIGABRT, abortHandler);
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// Install a SIGIO handler to handle asynchronous file IO. See the
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// PollQueue class.
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installSignalHandler(SIGIO, ioHandler);
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}
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