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Fix video_manager::throttle_until_ticks (#2309)

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Do not update m_average_oversleep if we overslept too much.
This is still a partial fix, more investigation is needed when the system time jumps backward.
This commit is contained in:
057a3dd61f99517a3afea0051a49cb27994f94d 2017-05-17 13:11:53 +00:00 committed by GitHub
parent fc0a2a32e0
commit b6625b4104
1 changed files with 6 additions and 1 deletions
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7
src/emu/video.cpp
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@ -914,8 +914,13 @@ osd_ticks_t video_manager::throttle_until_ticks(osd_ticks_t target_ticks)
if (slept)
{
// if we overslept, keep an average of the amount
// however, if we overslept too much, which is very likely resulted by a system time
// change, instead of inaccuracy of sleep, we should not update this average amount, as
// it's both a wrong reflection of the average and will potentially cause delta to be
// calculated as a very small value, even less than minimum_sleep, which will make this
// loop to be a busy one wasting cpu resource
osd_ticks_t actual_ticks = new_ticks - current_ticks;
if (actual_ticks > delta)
if (actual_ticks > delta && actual_ticks < delta * 2)
{
// take 90% of the previous average plus 10% of the new value
osd_ticks_t oversleep_milliticks = 1000 * (actual_ticks - delta) / delta;