use NtDelayExecution for SDL_SYS_DelayNS

Author: expikr

src/timer/windows/SDL_systimer.c

@@ -103,31 +103,13 @@ Uint64 SDL_GetPerformanceFrequency(void)
     return (Uint64)frequency.QuadPart;
 }
 
+NTSYSAPI NTSTATUS NTAPI NtDelayExecution( BOOLEAN Alertable, PLARGE_INTEGER DelayInterval );
 void SDL_SYS_DelayNS(Uint64 ns)
 {
-    HANDLE timer = SDL_GetWaitableTimer();
-    if (timer) {
-        LARGE_INTEGER due_time;
-        due_time.QuadPart = -((LONGLONG)ns / 100);
-        if (pSetWaitableTimerEx(timer, &due_time, 0, NULL, NULL, NULL, 0)) {
-            WaitForSingleObject(timer, INFINITE);
-        }
-        return;
-    }
-
-    const Uint64 max_delay = 0xffffffffLL * SDL_NS_PER_MS;
-    if (ns > max_delay) {
-        ns = max_delay;
-    }
-    const DWORD delay = (DWORD)SDL_NS_TO_MS(ns);
-
-    HANDLE event = SDL_GetWaitableEvent();
-    if (event) {
-        WaitForSingleObjectEx(event, delay, FALSE);
-        return;
-    }
-
-    Sleep(delay);
+    Sint64 tick = ns;
+    tick /= 500;
+    tick *= -1;
+    NtDelayExecution(0, (PLARGE_INTEGER)&tick);
 }
 
 #endif // SDL_TIMER_WINDOWS