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Dynamically load CreateWaitableTimerExW and SetWaitableTimerEx

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These functions are not available on Windows XP
This commit is contained in:
Sam Lantinga
2025-01-29 04:41:50 -08:00
parent 409f3ade88
commit 8298d60e4a
1 changed files with 24 additions and 2 deletions
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26
src/timer/windows/SDL_systimer.c
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@@ -24,6 +24,11 @@
#include "../../core/windows/SDL_windows.h" #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) static void SDL_CleanupWaitableHandle(void *handle)
{ {
@@ -36,9 +41,26 @@ static HANDLE SDL_GetWaitableTimer(void)
static SDL_TLSID TLS_timer_handle; static SDL_TLSID TLS_timer_handle;
HANDLE timer; 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); timer = SDL_GetTLS(&TLS_timer_handle);
if (!timer) { 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) { if (timer) {
SDL_SetTLS(&TLS_timer_handle, timer, SDL_CleanupWaitableHandle); SDL_SetTLS(&TLS_timer_handle, timer, SDL_CleanupWaitableHandle);
} }
@@ -89,7 +111,7 @@ void SDL_SYS_DelayNS(Uint64 ns)
if (timer) { if (timer) {
LARGE_INTEGER due_time; LARGE_INTEGER due_time;
due_time.QuadPart = -((LONGLONG)ns / 100); 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); WaitForSingleObject(timer, INFINITE);
} }
return; return;