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Always use WaitForSingleObjectEx() as a fallback in SDL_SYS_DelayNS()

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That logic isn't specific to the Visual Studio build environment. Also switched it to use CreateEvent(), which works back to Windows XP.
This commit is contained in:
Sam Lantinga 2024-10-11 21:00:09 -07:00
parent c5904d8710
commit c6c195ff88
1 changed files with 32 additions and 20 deletions
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52
src/timer/windows/SDL_systimer.c
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@ -25,13 +25,13 @@
#include "../../core/windows/SDL_windows.h"
#ifdef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
static void SDL_CleanupWaitableTimer(void *timer)
static void SDL_CleanupWaitableHandle(void *handle)
{
CloseHandle(timer);
CloseHandle(handle);
}
HANDLE SDL_GetWaitableTimer(void)
#ifdef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
static HANDLE SDL_GetWaitableTimer(void)
{
static SDL_TLSID TLS_timer_handle;
HANDLE timer;
@ -40,13 +40,28 @@ HANDLE SDL_GetWaitableTimer(void)
if (!timer) {
timer = CreateWaitableTimerExW(NULL, NULL, CREATE_WAITABLE_TIMER_HIGH_RESOLUTION, TIMER_ALL_ACCESS);
if (timer) {
SDL_SetTLS(&TLS_timer_handle, timer, SDL_CleanupWaitableTimer);
SDL_SetTLS(&TLS_timer_handle, timer, SDL_CleanupWaitableHandle);
}
}
return timer;
}
#endif // CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
static HANDLE SDL_GetWaitableEvent(void)
{
static SDL_TLSID TLS_event_handle;
HANDLE event;
event = SDL_GetTLS(&TLS_event_handle);
if (!event) {
event = CreateEvent(NULL, FALSE, FALSE, NULL);
if (event) {
SDL_SetTLS(&TLS_event_handle, event, SDL_CleanupWaitableHandle);
}
}
return event;
}
Uint64 SDL_GetPerformanceCounter(void)
{
LARGE_INTEGER counter;
@ -81,22 +96,19 @@ void SDL_SYS_DelayNS(Uint64 ns)
}
#endif
{
const Uint64 max_delay = 0xffffffffLL * SDL_NS_PER_MS;
if (ns > max_delay) {
ns = max_delay;
}
#if defined(_MSC_FULL_VER) && (_MSC_FULL_VER <= 180030723)
static HANDLE mutex = 0;
if (!mutex) {
mutex = CreateEventEx(0, 0, 0, EVENT_ALL_ACCESS);
}
WaitForSingleObjectEx(mutex, (DWORD)SDL_NS_TO_MS(ns), FALSE);
#else
Sleep((DWORD)SDL_NS_TO_MS(ns));
#endif
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);
}
#endif // SDL_TIMER_WINDOWS