void spring_time::sleep(bool forceThreadSleep)
{
if (forceThreadSleep) {
spring::this_thread::sleep_for(chrono::nanoseconds(toNanoSecsi()));
return;
}
// for very short time intervals use a yielding loop (yield is ~5x more accurate than sleep(), check the UnitTest)
if (toMicroSecsi() < (avgThreadSleepTimeMicroSecs + avgThreadYieldTimeMicroSecs * 5)) {
const spring_time s = gettime();
while ((gettime() - s) < *this)
thread_yield();
return;
}
// expected wakeup time
const spring_time t0 = gettime() + *this;
spring::this_thread::sleep_for(chrono::nanoseconds(toNanoSecsi()));
const spring_time t1 = gettime();
const spring_time dt = t1 - t0;
if (t1 >= t0) {
// yes, it's not 100% thread correct, but it's okay when 1 of 1 million writes is dropped
int avg = avgThreadSleepTimeMicroSecs.load();
int newAvg = mix<float>(avg, dt.toMicroSecsf(), 0.1f);
avgThreadSleepTimeMicroSecs.store(newAvg);
}
}
static void thread_yield()
{
const spring_time t0 = spring_time::gettime();
this_thread::yield();
const spring_time t1 = spring_time::gettime();
const spring_time dt = t1 - t0;
if (t1 >= t0) {
// yes, it's not 100% thread correct, but it's okay when 1 of 1 million writes is dropped
int avg = avgThreadYieldTimeMicroSecs.load();
int newAvg = mix<float>(avg, dt.toMicroSecsf(), 0.1f);
avgThreadYieldTimeMicroSecs.store(newAvg);
}
}