From 8125f8ebd7e05baac594c9cf33b924670c3f9125 Mon Sep 17 00:00:00 2001
From: ImBenji <benjamin.watt@imbenji.net>
Date: Sun, 23 Nov 2025 18:02:30 +0000
Subject: [PATCH] Improve preciseSleep function for Windows with hybrid sleep
 strategy and logging

---
 dart/lib/helpers.dart | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/dart/lib/helpers.dart b/dart/lib/helpers.dart
index 7cdbfe4..8622f55 100644
--- a/dart/lib/helpers.dart
+++ b/dart/lib/helpers.dart
@@ -230,12 +230,24 @@ extension SweepstoreDateTimeHelper on DateTime {
 const Duration _windowsMinSleepTime = Duration(milliseconds: 16);
 
 void preciseSleep(Duration duration) {
-  if (Platform.isWindows && duration < _windowsMinSleepTime) {
-    // Busy-wait for short durations on Windows
-    final end = DateTime.now().add(duration);
-    while (DateTime.now().isBefore(end)) {}
+  final stopwatch = Stopwatch()..start();
+
+  if (Platform.isWindows) {
+    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 {
-    // Use normal sleep for longer durations or on Unix
     sleep(duration);
   }
+
+  stopwatch.stop();
+  print('preciseSleep: requested ${duration.inMicroseconds}μs, actual ${stopwatch.elapsedMicroseconds}μs, diff ${stopwatch.elapsedMicroseconds - duration.inMicroseconds}μs');
 }
\ No newline at end of file