From 8cb1ff94522c8705831293eeb58017e910dcaff1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Robin=20H=C3=BCbner?= <profan@prfn.se>
Date: Tue, 1 May 2018 09:47:34 +0200
Subject: [PATCH] windows: ensure minimum possible timer resolution for sleep

---
 platform/windows/os_windows.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/platform/windows/os_windows.cpp b/platform/windows/os_windows.cpp
index 9c37b65d771..7c8dff76fe8 100644
--- a/platform/windows/os_windows.cpp
+++ b/platform/windows/os_windows.cpp
@@ -188,6 +188,10 @@ void OS_Windows::initialize_core() {
 	ticks_start = 0;
 	ticks_start = get_ticks_usec();
 
+	// set minimum resolution for periodic timers, otherwise Sleep(n) may wait at least as
+	//  long as the windows scheduler resolution (~16-30ms) even for calls like Sleep(1)
+	timeBeginPeriod(1);
+
 	process_map = memnew((Map<ProcessID, ProcessInfo>));
 
 	IP_Unix::make_default();
@@ -1261,6 +1265,8 @@ void OS_Windows::finalize() {
 
 void OS_Windows::finalize_core() {
 
+	timeEndPeriod(1);
+
 	memdelete(process_map);
 
 	TCPServerWinsock::cleanup();