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testtimer.c
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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;
static Uint32 SDLCALL
ticktock(Uint32 interval)
{
++ticks;
return (interval);
}
static Uint32 SDLCALL
callback(Uint32 interval, void *param)
{
printf("Timer %d : param = %d\n", interval, (int) (uintptr_t) 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 initialize SDL: %s\n", SDL_GetError());
return (1);
}
/* 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)
fprintf(stderr, "Could not create timer 1: %s\n", SDL_GetError());
t2 = SDL_AddTimer(50, callback, (void *) 2);
if (!t2)
fprintf(stderr, "Could not create timer 2: %s\n", SDL_GetError());
t3 = SDL_AddTimer(233, callback, (void *) 3);
if (!t3)
fprintf(stderr, "Could not create timer 3: %s\n", SDL_GetError());
/* 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);
SDL_Quit();
return (0);
}