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Improve preciseSleep function for Windows with hybrid sleep strategy and logging

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ImBenji
2025-11-23 18:02:30 +00:00
parent 747f0bd1ed
commit 8125f8ebd7
1 changed files with 17 additions and 5 deletions
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22
dart/lib/helpers.dart
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@@ -230,12 +230,24 @@ extension SweepstoreDateTimeHelper on DateTime {
const Duration _windowsMinSleepTime = Duration(milliseconds: 16); const Duration _windowsMinSleepTime = Duration(milliseconds: 16);
void preciseSleep(Duration duration) { void preciseSleep(Duration duration) {
if (Platform.isWindows && duration < _windowsMinSleepTime) { final stopwatch = Stopwatch()..start();
// Busy-wait for short durations on Windows
final end = DateTime.now().add(duration); if (Platform.isWindows) {
while (DateTime.now().isBefore(end)) {} if (duration < _windowsMinSleepTime) {
// Pure busy-wait for very short durations
final end = DateTime.now().add(duration);
while (DateTime.now().isBefore(end)) {}
} else {
// Hybrid: sleep most of it, busy-wait the remainder
final sleepDuration = duration - _windowsMinSleepTime;
sleep(sleepDuration);
final end = DateTime.now().add(_windowsMinSleepTime);
while (DateTime.now().isBefore(end)) {}
}
} else { } else {
// Use normal sleep for longer durations or on Unix
sleep(duration); sleep(duration);
} }
stopwatch.stop();
print('preciseSleep: requested ${duration.inMicroseconds}μs, actual ${stopwatch.elapsedMicroseconds}μs, diff ${stopwatch.elapsedMicroseconds - duration.inMicroseconds}μs');
} }