testtimer.c
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/* Test program to check the resolution of the SDL timer on the current
platform
*/
#include <stdlib.h>
#include <stdio.h>
#include "SDL.h"
#define DEFAULT_RESOLUTION 1
static int ticks = 0;
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void quit(int rc)
{
SDL_Quit();
exit(rc);
}
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static Uint32 ticktock(Uint32 interval)
{
++ticks;
return(interval);
}
static Uint32 callback(Uint32 interval, void *param)
{
printf("Timer %d : param = %d\n", interval, (int) param);
return interval;
}
int main(int argc, char *argv[])
{
int desired;
SDL_TimerID t1, t2, t3;
if ( SDL_Init(SDL_INIT_TIMER) < 0 ) {
fprintf(stderr, "Couldn't load SDL: %s\n", SDL_GetError());
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}
/* Start the timer */
desired = 0;
if ( argv[1] ) {
desired = atoi(argv[1]);
}
if ( desired == 0 ) {
desired = DEFAULT_RESOLUTION;
}
SDL_SetTimer(desired, ticktock);
/* Wait 10 seconds */
printf("Waiting 10 seconds\n");
SDL_Delay(10*1000);
/* Stop the timer */
SDL_SetTimer(0, NULL);
/* Print the results */
if ( ticks ) {
fprintf(stderr,
"Timer resolution: desired = %d ms, actual = %f ms\n",
desired, (double)(10*1000)/ticks);
}
/* Test multiple timers */
printf("Testing multiple timers...\n");
t1 = SDL_AddTimer(100, callback, (void*)1);
if(!t1)
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fprintf(stderr,"Could not create timer 1: %s\n", SDL_GetError());
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t2 = SDL_AddTimer(50, callback, (void*)2);
if(!t2)
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fprintf(stderr,"Could not create timer 2: %s\n", SDL_GetError());
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t3 = SDL_AddTimer(233, callback, (void*)3);
if(!t3)
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fprintf(stderr,"Could not create timer 3: %s\n", SDL_GetError());
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/* Wait 10 seconds */
printf("Waiting 10 seconds\n");
SDL_Delay(10*1000);
printf("Removing timer 1 and waiting 5 more seconds\n");
SDL_RemoveTimer(t1);
SDL_Delay(5*1000);
SDL_RemoveTimer(t2);
SDL_RemoveTimer(t3);
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return(0);
}