geemili
/
SDL
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Save waitable timers in thread local storage instead of continuously allocating and freeing them 

Fixes https://github.com/libsdl-org/SDL/issues/6597
main
Sam Lantinga 2023-05-23 11:32:40 -07:00
parent ddbdd73258
commit e92e4d8b50
1 changed files with 26 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
src/timer/windows/SDL_systimer.c
View File

@ -25,6 +25,31 @@
#include "../../core/windows/SDL_windows.h"
#ifdef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
static void SDL_CleanupWaitableTimer(void *timer)
{
CloseHandle(timer);
}
HANDLE SDL_GetWaitableTimer()
{
static SDL_TLSID TLS_timer_handle;
HANDLE timer;
if (!TLS_timer_handle) {
TLS_timer_handle = SDL_TLSCreate();
}
timer = SDL_TLSGet(TLS_timer_handle);
if (!timer) {
timer = CreateWaitableTimerExW(NULL, NULL, CREATE_WAITABLE_TIMER_HIGH_RESOLUTION, TIMER_ALL_ACCESS);
if (timer) {
SDL_TLSSet(TLS_timer_handle, timer, SDL_CleanupWaitableTimer);
}
}
return timer;
}
#endif /* CREATE_WAITABLE_TIMER_HIGH_RESOLUTION */
Uint64 SDL_GetPerformanceCounter(void)
{
LARGE_INTEGER counter;
@ -58,14 +83,13 @@ void SDL_DelayNS(Uint64 ns)
* apps and libraries.
*/
#ifdef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
HANDLE timer = CreateWaitableTimerExW(NULL, NULL, CREATE_WAITABLE_TIMER_HIGH_RESOLUTION, TIMER_ALL_ACCESS);
HANDLE timer = SDL_GetWaitableTimer();
if (timer) {
LARGE_INTEGER due_time;
due_time.QuadPart = -((LONGLONG)ns / 100);
if (SetWaitableTimerEx(timer, &due_time, 0, NULL, NULL, NULL, 0)) {
WaitForSingleObject(timer, INFINITE);
}
CloseHandle(timer);
return;
}
#endif