From c00d139e556c7231aeb5ed61cd4c9999866f5a67 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gustaf=20Alh=C3=A4ll?= <gustaf@hanicef.me>
Date: Sat, 4 Jan 2025 20:12:00 +0100
Subject: [PATCH] Further improve sleep accuracy on UNIX systems
---
src/sdl/i_system.c | 22 +++++++++++++++-------
1 file changed, 15 insertions(+), 7 deletions(-)
diff --git a/src/sdl/i_system.c b/src/sdl/i_system.c
index 07088b9578..4d62c42875 100644
--- a/src/sdl/i_system.c
+++ b/src/sdl/i_system.c
@@ -2309,13 +2309,21 @@ void I_SleepDuration(precise_t duration)
{
#if defined(__linux__) || defined(__FreeBSD__) || defined(__HAIKU__)
UINT64 precision = I_GetPrecisePrecision();
- struct timespec ts = {
- .tv_sec = duration / precision,
- .tv_nsec = duration * 1000000000 / precision % 1000000000,
- };
- int status;
- do status = clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, &ts);
- while (status == EINTR);
+ precise_t dest = I_GetPreciseTime() + duration;
+ if (duration > 100000)
+ {
+ duration -= 100000; // 0.1 ms slack
+ struct timespec ts = {
+ .tv_sec = duration / precision,
+ .tv_nsec = duration * 1000000000 / precision % 1000000000,
+ };
+ int status;
+ do status = clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, &ts);
+ while (status == EINTR);
+ }
+
+ // busy-wait the rest
+ while (((INT64)dest - (INT64)I_GetPreciseTime()) > 0);
#elif defined (MIN_SLEEP_DURATION_MS)
UINT64 precision = I_GetPrecisePrecision();
INT32 sleepvalue = cv_sleep.value;
--
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