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Make coretiming waiting more accurate

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This commit is contained in:
Kelebek1 2022-07-27 22:31:41 +01:00 committed by Morph
parent 9d3b190465
commit 83a24ad638
2 changed files with 32 additions and 12 deletions
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4
src/common/thread.h
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@ -54,6 +54,10 @@ public:
is_set = false;
}
[[nodiscard]] bool IsSet() {
return is_set;
}
private:
std::condition_variable condvar;
std::mutex mutex;

40
src/core/core_timing.cpp
View file

@ -243,17 +243,17 @@ std::optional<s64> CoreTiming::Advance() {
basic_lock.lock();
if (evt.reschedule_time != 0) {
// If this event was scheduled into a pause, its time now is going to be way behind.
// Re-set this event to continue from the end of the pause.
auto next_time{evt.time + evt.reschedule_time};
if (evt.time < pause_end_time) {
next_time = pause_end_time + evt.reschedule_time;
}
const auto next_schedule_time{new_schedule_time.has_value()
? new_schedule_time.value().count()
: evt.reschedule_time};
// If this event was scheduled into a pause, its time now is going to be way behind.
// Re-set this event to continue from the end of the pause.
auto next_time{evt.time + next_schedule_time};
if (evt.time < pause_end_time) {
next_time = pause_end_time + next_schedule_time;
}
event_queue.emplace_back(
Event{next_time, event_fifo_id++, evt.user_data, evt.type, next_schedule_time});
std::push_heap(event_queue.begin(), event_queue.end(), std::greater<>());
@ -264,8 +264,7 @@ std::optional<s64> CoreTiming::Advance() {
}
if (!event_queue.empty()) {
const s64 next_time = event_queue.front().time - global_timer;
return next_time;
return event_queue.front().time;
} else {
return std::nullopt;
}
@ -278,11 +277,28 @@ void CoreTiming::ThreadLoop() {
paused_set = false;
const auto next_time = Advance();
if (next_time) {
if (*next_time > 0) {
std::chrono::nanoseconds next_time_ns = std::chrono::nanoseconds(*next_time);
event.WaitFor(next_time_ns);
// There are more events left in the queue, sleep until the next event.
const auto diff_ns{*next_time - GetGlobalTimeNs().count()};
if (diff_ns > 0) {
// Only try to sleep if the remaining time is >= 1ms. Take off 500 microseconds
// from the target time to account for possible over-sleeping, and spin the
// remaining.
const auto sleep_time_ns{diff_ns - 500LL * 1'000LL};
const auto sleep_time_ms{sleep_time_ns / 1'000'000LL};
if (sleep_time_ms >= 1) {
event.WaitFor(std::chrono::nanoseconds(sleep_time_ns));
}
const auto end_time{std::chrono::nanoseconds(*next_time)};
while (!paused && !event.IsSet() && GetGlobalTimeNs() < end_time) {
}
if (event.IsSet()) {
event.Reset();
}
}
} else {
// Queue is empty, wait until another event is scheduled and signals us to continue.
wait_set = true;
event.Wait();
}