From 8298d60e4a8a7f6c3e01fa0b6032e1a078e07dae Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Wed, 29 Jan 2025 04:41:50 -0800
Subject: [PATCH] Dynamically load CreateWaitableTimerExW and
SetWaitableTimerEx
These functions are not available on Windows XP
---
src/timer/windows/SDL_systimer.c | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/src/timer/windows/SDL_systimer.c b/src/timer/windows/SDL_systimer.c
index 01e908c6d8c0e..49f27cfe9d511 100644
--- a/src/timer/windows/SDL_systimer.c
+++ b/src/timer/windows/SDL_systimer.c
@@ -24,6 +24,11 @@
#include "../../core/windows/SDL_windows.h"
+typedef HANDLE (WINAPI *CreateWaitableTimerExW_t)(LPSECURITY_ATTRIBUTES lpTimerAttributes, LPCWSTR lpTimerName, DWORD dwFlags, DWORD dwDesiredAccess);
+static CreateWaitableTimerExW_t pCreateWaitableTimerExW;
+
+typedef BOOL (WINAPI *SetWaitableTimerEx_t)(HANDLE hTimer, const LARGE_INTEGER *lpDueTime, LONG lPeriod, PTIMERAPCROUTINE pfnCompletionRoutine, LPVOID lpArgToCompletionRoutine, PREASON_CONTEXT WakeContext, ULONG TolerableDelay);
+static SetWaitableTimerEx_t pSetWaitableTimerEx;
static void SDL_CleanupWaitableHandle(void *handle)
{
@@ -36,9 +41,26 @@ static HANDLE SDL_GetWaitableTimer(void)
static SDL_TLSID TLS_timer_handle;
HANDLE timer;
+ if (!pCreateWaitableTimerExW || !pSetWaitableTimerEx) {
+ static bool initialized;
+
+ if (!initialized) {
+ HMODULE module = GetModuleHandle(TEXT("kernel32.dll"));
+ if (module) {
+ pCreateWaitableTimerExW = (CreateWaitableTimerExW_t)GetProcAddress(module, "CreateWaitableTimerExW");
+ pSetWaitableTimerEx = (SetWaitableTimerEx_t)GetProcAddress(module, "SetWaitableTimerEx");
+ }
+ initialized = true;
+ }
+
+ if (!pCreateWaitableTimerExW || !pSetWaitableTimerEx) {
+ return NULL;
+ }
+ }
+
timer = SDL_GetTLS(&TLS_timer_handle);
if (!timer) {
- timer = CreateWaitableTimerExW(NULL, NULL, CREATE_WAITABLE_TIMER_HIGH_RESOLUTION, TIMER_ALL_ACCESS);
+ timer = pCreateWaitableTimerExW(NULL, NULL, CREATE_WAITABLE_TIMER_HIGH_RESOLUTION, TIMER_ALL_ACCESS);
if (timer) {
SDL_SetTLS(&TLS_timer_handle, timer, SDL_CleanupWaitableHandle);
}
@@ -89,7 +111,7 @@ void SDL_SYS_DelayNS(Uint64 ns)
if (timer) {
LARGE_INTEGER due_time;
due_time.QuadPart = -((LONGLONG)ns / 100);
- if (SetWaitableTimerEx(timer, &due_time, 0, NULL, NULL, NULL, 0)) {
+ if (pSetWaitableTimerEx(timer, &due_time, 0, NULL, NULL, NULL, 0)) {
WaitForSingleObject(timer, INFINITE);
}
return;