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use QEventLoop and a timer for a less CPU using sleep + event-processing

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This commit is contained in:
Seth Alves 2017-06-26 15:07:22 -07:00
parent 9ae390853c
commit bf7da71eaf
1 changed files with 13 additions and 16 deletions
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29
libraries/script-engine/src/ScriptEngine.cpp
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@ -1067,24 +1067,21 @@ void ScriptEngine::run() {
// on shutdown and stop... so we want to loop and sleep until we've spent our time in // on shutdown and stop... so we want to loop and sleep until we've spent our time in
// purgatory, constantly checking to see if our script was asked to end // purgatory, constantly checking to see if our script was asked to end
bool processedEvents = false; bool processedEvents = false;
while (!_isFinished && clock::now() < sleepUntil) { if (!_isFinished) {
PROFILE_RANGE(script, "processEvents-sleep");
{ std::chrono::milliseconds sleepFor =
PROFILE_RANGE(script, "processEvents-sleep"); std::chrono::duration_cast<std::chrono::milliseconds>(sleepUntil - clock::now());
QCoreApplication::processEvents(); // before we sleep again, give events a chance to process if (sleepFor > std::chrono::milliseconds(0)) {
QEventLoop loop;
QTimer timer;
timer.setSingleShot(true);
connect(&timer, SIGNAL(timeout()), &loop, SLOT(quit()));
timer.start(sleepFor);
loop.exec();
} else {
QCoreApplication::processEvents();
} }
processedEvents = true; processedEvents = true;
// If after processing events, we're past due, exit asap
if (clock::now() >= sleepUntil) {
break;
}
// We only want to sleep a small amount so that any pending events (like timers or invokeMethod events)
// will be able to process quickly.
static const int SMALL_SLEEP_AMOUNT = 100;
auto smallSleepUntil = clock::now() + static_cast<std::chrono::microseconds>(SMALL_SLEEP_AMOUNT);
std::this_thread::sleep_until(smallSleepUntil);
} }
PROFILE_RANGE(script, "ScriptMainLoop"); PROFILE_RANGE(script, "ScriptMainLoop");