/*   Sheila McKain
*    Assignment #2 - Main Program
*    Bridge
*    Realtime Systems */

#include "pv.h"
#include "sem.c"


main()
{
	key_t semkey = 0x200;

	if(fork() == 0)
		handlesem(semkey);

	if(fork() == 0)
		handlesem(semkey);

	if(fork() == 0)
		handlesem(semkey);
}

handlesem(skey)
key_t skey;
{
	int semid, pid = getpid();
	
	if((semid = initsem(skey)) < 0)
		exit(1);
	printf("\nprocess %d before critical section\n",pid);

	p(semid);
	printf("process in critical section\n",pid);
	sleep(10);
	printf("process leaving critical section\n",pid);

	v(semid);
	printf("process %d exiting\n",pid);
	exit(0);
}