/* Simple test of the SDL semaphore code */

#include <stdio.h>

#include <stdlib.h>

#include <signal.h>

#include "SDL.h"

#include "SDL_thread.h"

#define NUM_THREADS 10

static SDL_sem *sem;

int alive = 1;

int ThreadFunc(void *data)

{

	while ( alive ) {

		SDL_SemWait(sem);

		fprintf(stderr, "Thread number %d has got the semaphore (value = %d)!\n", (int)data, SDL_SemValue(sem));

		SDL_Delay(200);

		SDL_SemPost(sem);

		fprintf(stderr, "Thread number %d has released the semaphore (value = %d)!\n", (int)data, SDL_SemValue(sem));

		SDL_Delay(1); /* For the scheduler */

	}

	printf("Thread number %d exiting.\n", (int)data);

	return 0;

}

static void killed(int sig)

{

	alive = 0;

}

int main(int argc, char **argv)

{

	SDL_Thread *threads[NUM_THREADS];

	int i, init_sem;

	if(argc < 2) {

		fprintf(stderr,"Usage: %s init_value\n", argv[0]);

		exit(1);

	}

	/* Load the SDL library */

	if ( SDL_Init(0) < 0 ) {

		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());

		exit(1);

	}

	atexit(SDL_Quit);

	signal(SIGTERM, killed);

	signal(SIGINT, killed);

	init_sem = atoi(argv[1]);

	sem = SDL_CreateSemaphore(init_sem);

	printf("Running %d threads, semaphore value = %d\n", NUM_THREADS, init_sem);

	/* Create all the threads */

	for( i = 0; i < NUM_THREADS; ++i ) {

		threads[i] = SDL_CreateThread(ThreadFunc, (void*)i);

	}

	/* Wait 10 seconds */

	SDL_Delay(10 * 1000);

	/* Wait for all threads to finish */

	printf("Waiting for threads to finish\n");

	alive = 0;

	for( i = 0; i < NUM_THREADS; ++i ) {

		SDL_WaitThread(threads[i], NULL);

	}

	printf("Finished waiting for threads\n");

	SDL_DestroySemaphore(sem);

	return(0);

}