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Remove the minimum constraint for sleep, thus avoid choosing a seemingly

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arbitrary constant.
This commit is contained in:
057a3dd61f99517a3afea0051a49cb27994f94d 2017-05-20 09:56:03 +00:00 committed by somebody
parent 5b39822103
commit cb6fc11722
1 changed files with 4 additions and 8 deletions
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12
src/emu/video.cpp
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@ -892,16 +892,17 @@ osd_ticks_t video_manager::throttle_until_ticks(osd_ticks_t target_ticks)
// loop until we reach our target
g_profiler.start(PROFILER_IDLE);
osd_ticks_t minimum_sleep = osd_ticks_per_second() / 1000;
osd_ticks_t current_ticks = osd_ticks();
while (current_ticks < target_ticks)
{
// compute how much time to sleep for, taking into account the average oversleep
osd_ticks_t delta = (target_ticks - current_ticks) * 1000 / (1000 + m_average_oversleep);
if (!delta)
delta = 1;
// see if we can sleep
bool slept = false;
if (allowed_to_sleep && delta >= minimum_sleep)
if (allowed_to_sleep)
{
osd_sleep(delta);
slept = true;
@ -914,13 +915,8 @@ 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 && actual_ticks < delta * 10)
if (actual_ticks > delta)
{
// take 90% of the previous average plus 10% of the new value
osd_ticks_t oversleep_milliticks = 1000 * (actual_ticks - delta) / delta;