/* Test the thread and mutex locking functions 

   Also exercises the system's signal/thread interaction

*/

#include <signal.h>

#include <stdio.h>

#include "SDL.h"

#include "SDL_mutex.h"

#include "SDL_thread.h"

static SDL_mutex *mutex = NULL;

static Uint32 mainthread;

static SDL_Thread *threads[6];

static volatile int doterminate = 0;

/*

 * SDL_Quit() shouldn't be used with atexit() directly because

 *  calling conventions may differ...

 */

static void SDL_Quit_Wrapper(void)

{

	SDL_Quit();

}

void printid(void)

{

	printf("Process %u:  exiting\n", SDL_ThreadID());

}

void terminate(int sig)

{

	signal(SIGINT, terminate);

	doterminate = 1;

}

void closemutex(int sig)

{

	Uint32 id = SDL_ThreadID();

	int i;

	printf("Process %u:  Cleaning up...\n", id == mainthread ? 0 : id);

	for ( i=0; i<6; ++i )

		SDL_KillThread(threads[i]);

	SDL_DestroyMutex(mutex);

	exit(sig);

}

int SDLCALL Run(void *data)

{

	if ( SDL_ThreadID() == mainthread )

		signal(SIGTERM, closemutex);

	while ( 1 ) {

		printf("Process %u ready to work\n", SDL_ThreadID());

		if ( SDL_mutexP(mutex) < 0 ) {

			fprintf(stderr, "Couldn't lock mutex: %s", SDL_GetError());

			exit(1);

		}

		printf("Process %u, working!\n", SDL_ThreadID());

		SDL_Delay(1*1000);

		printf("Process %u, done!\n", SDL_ThreadID());

		if ( SDL_mutexV(mutex) < 0 ) {

			fprintf(stderr, "Couldn't unlock mutex: %s", SDL_GetError());

			exit(1);

		}

		/* If this sleep isn't done, then threads may starve */

		SDL_Delay(10);

		if (SDL_ThreadID() == mainthread && doterminate) {

			printf("Process %u:  raising SIGTERM\n", SDL_ThreadID());

			raise(SIGTERM);

		}

	}

	return(0);

}

int main(int argc, char *argv[])

{

	int i;

	int maxproc = 6;

	/* Load the SDL library */

	if ( SDL_Init(0) < 0 ) {

		fprintf(stderr, "%s\n", SDL_GetError());

		exit(1);

	}

	atexit(SDL_Quit_Wrapper);

	if ( (mutex=SDL_CreateMutex()) == NULL ) {

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

		exit(1);

	}

	mainthread = SDL_ThreadID();

	printf("Main thread: %u\n", mainthread);

	atexit(printid);

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

		if ( (threads[i]=SDL_CreateThread(Run, NULL)) == NULL )

			fprintf(stderr, "Couldn't create thread!\n");

	}

	signal(SIGINT, terminate);

	Run(NULL);

	return(0);	/* Never reached */

}