test/testtimer.c
author Ryan C. Gordon <icculus@icculus.org>
Wed, 28 Sep 2005 11:36:20 +0000
changeset 1151 be9c9c8f6d53
parent 766 ed57c876700d
child 1484 b2b476a4a73c
permissions -rw-r--r--
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
if SDL is built with a non-cdecl calling convention, and it's just generally
bad practice anyhow.

Now programs explicitly call SDL_Quit() where appropriate, wrap SDL_Quit() in
a cdecl function where it can't be avoided, and rely on the parachute where
a crash might have hit the atexit() before (these ARE test programs, after
all!).
     1 
     2 /* Test program to check the resolution of the SDL timer on the current
     3    platform
     4 */
     5 
     6 #include <stdlib.h>
     7 #include <stdio.h>
     8 
     9 #include "SDL.h"
    10 
    11 #define DEFAULT_RESOLUTION	1
    12 
    13 static int ticks = 0;
    14 
    15 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
    16 static void quit(int rc)
    17 {
    18 	SDL_Quit();
    19 	exit(rc);
    20 }
    21 
    22 static Uint32 ticktock(Uint32 interval)
    23 {
    24 	++ticks;
    25 	return(interval);
    26 }
    27 
    28 static Uint32 callback(Uint32 interval, void *param)
    29 {
    30   printf("Timer %d : param = %d\n", interval, (int) param);
    31   return interval;
    32 }
    33 
    34 int main(int argc, char *argv[])
    35 {
    36 	int desired;
    37 	SDL_TimerID t1, t2, t3;
    38 
    39 	if ( SDL_Init(SDL_INIT_TIMER) < 0 ) {
    40 		fprintf(stderr, "Couldn't load SDL: %s\n", SDL_GetError());
    41 		return(1);
    42 	}
    43 
    44 	/* Start the timer */
    45 	desired = 0;
    46 	if ( argv[1] ) {
    47 		desired = atoi(argv[1]);
    48 	}
    49 	if ( desired == 0 ) {
    50 		desired = DEFAULT_RESOLUTION;
    51 	}
    52 	SDL_SetTimer(desired, ticktock);
    53 
    54 	/* Wait 10 seconds */
    55 	printf("Waiting 10 seconds\n");
    56 	SDL_Delay(10*1000);
    57 
    58 	/* Stop the timer */
    59 	SDL_SetTimer(0, NULL);
    60 
    61 	/* Print the results */
    62 	if ( ticks ) {
    63 		fprintf(stderr,
    64 		"Timer resolution: desired = %d ms, actual = %f ms\n",
    65 					desired, (double)(10*1000)/ticks);
    66 	}
    67 	
    68 	/* Test multiple timers */
    69 	printf("Testing multiple timers...\n");
    70 	t1 = SDL_AddTimer(100, callback, (void*)1);
    71 	if(!t1)
    72 	  fprintf(stderr,"Could not create timer 1: %s\n", SDL_GetError());
    73 	t2 = SDL_AddTimer(50, callback, (void*)2);
    74 	if(!t2)
    75 	  fprintf(stderr,"Could not create timer 2: %s\n", SDL_GetError());
    76 	t3 = SDL_AddTimer(233, callback, (void*)3);
    77 	if(!t3)
    78 	  fprintf(stderr,"Could not create timer 3: %s\n", SDL_GetError());
    79 	
    80 	/* Wait 10 seconds */
    81 	printf("Waiting 10 seconds\n");
    82 	SDL_Delay(10*1000);
    83 
    84 	printf("Removing timer 1 and waiting 5 more seconds\n");
    85 	SDL_RemoveTimer(t1);
    86 
    87 	SDL_Delay(5*1000);
    88 
    89 	SDL_RemoveTimer(t2);
    90 	SDL_RemoveTimer(t3);
    91 
    92 	SDL_Quit();
    93 	return(0);
    94 }