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sim: prioritize async events; prevent starvation

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If a time quantum event is the only one in the queue, async
events (Ctrl-C, I/O, etc.) will never be processed.

So process them first.
This commit is contained in:
Curtis Dunham 2014-12-19 15:32:34 -06:00
parent 20111ba917
commit b89fd57663
1 changed files with 10 additions and 11 deletions
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21
src/sim/simulate.cc
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@ -192,37 +192,36 @@ doSimLoop(EventQueue *eventq)
assert(curTick() <= eventq->nextTick() &&
"event scheduled in the past");
Event *exit_event = eventq->serviceOne();
if (exit_event != NULL) {
return exit_event;
}
if (async_event && testAndClearAsyncEvent()) {
// Take the event queue lock in case any of the service
// routines want to schedule new events.
std::lock_guard<EventQueue> lock(*eventq);
async_event = false;
if (async_statdump || async_statreset) {
Stats::schedStatEvent(async_statdump, async_statreset);
async_statdump = false;
async_statreset = false;
}
if (async_exit) {
async_exit = false;
exitSimLoop("user interrupt received");
}
if (async_io) {
async_io = false;
pollQueue.service();
}
if (async_exit) {
async_exit = false;
exitSimLoop("user interrupt received");
}
if (async_exception) {
async_exception = false;
return NULL;
}
}
Event *exit_event = eventq->serviceOne();
if (exit_event != NULL) {
return exit_event;
}
}
// not reached... only exit is return on SimLoopExitEvent