test/testsem.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 17 May 2006 08:18:28 +0000
branchSDL-1.3
changeset 1659 14717b52abc0
parent 1615 d5298e8f22b3
child 1662 782fd950bd46
child 1895 c121d94672cb
child 5105 99acf3d856cb
permissions -rw-r--r--
Merge trunk-1.3-3
     1 
     2 /* Simple test of the SDL semaphore code */
     3 
     4 #include <stdio.h>
     5 #include <stdlib.h>
     6 #include <signal.h>
     7 
     8 #include "SDL.h"
     9 #include "SDL_thread.h"
    10 
    11 #define NUM_THREADS 10
    12 
    13 static SDL_sem *sem;
    14 int alive = 1;
    15 
    16 int SDLCALL ThreadFunc(void *data)
    17 {
    18 	int threadnum = (int)(uintptr_t)data;
    19 	while ( alive ) {
    20 		SDL_SemWait(sem);
    21 		fprintf(stderr, "Thread number %d has got the semaphore (value = %d)!\n", threadnum, SDL_SemValue(sem));
    22 		SDL_Delay(200);
    23 		SDL_SemPost(sem);
    24 		fprintf(stderr, "Thread number %d has released the semaphore (value = %d)!\n", threadnum, SDL_SemValue(sem));
    25 		SDL_Delay(1); /* For the scheduler */
    26 	}
    27 	printf("Thread number %d exiting.\n", threadnum);
    28 	return 0;
    29 }
    30 
    31 static void killed(int sig)
    32 {
    33 	alive = 0;
    34 }
    35 
    36 int main(int argc, char **argv)
    37 {
    38 	SDL_Thread *threads[NUM_THREADS];
    39 	uintptr_t i;
    40 	int init_sem;
    41 
    42 	if(argc < 2) {
    43 		fprintf(stderr,"Usage: %s init_value\n", argv[0]);
    44 		return(1);
    45 	}
    46 
    47 	/* Load the SDL library */
    48 	if ( SDL_Init(0) < 0 ) {
    49 		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
    50 		return(1);
    51 	}
    52 	signal(SIGTERM, killed);
    53 	signal(SIGINT, killed);
    54 	
    55 	init_sem = atoi(argv[1]);
    56 	sem = SDL_CreateSemaphore(init_sem);
    57 	
    58 	printf("Running %d threads, semaphore value = %d\n", NUM_THREADS, init_sem);
    59 	/* Create all the threads */
    60 	for( i = 0; i < NUM_THREADS; ++i ) {
    61 		threads[i] = SDL_CreateThread(ThreadFunc, (void*)i);
    62 	}
    63 
    64 	/* Wait 10 seconds */
    65 	SDL_Delay(10 * 1000);
    66 
    67 	/* Wait for all threads to finish */
    68 	printf("Waiting for threads to finish\n");
    69 	alive = 0;
    70 	for( i = 0; i < NUM_THREADS; ++i ) {
    71 		SDL_WaitThread(threads[i], NULL);
    72 	}
    73 	printf("Finished waiting for threads\n");
    74 
    75 	SDL_DestroySemaphore(sem);
    76 	SDL_Quit();
    77 	return(0);
    78 }