semaphore.c

#include <stdio.h>
#include <stdlib.h>
int mutex = 1,full = 0,empty = 3, x = 0;
void producer()
{
	--mutex;
	++full;
	--empty;
	x++;
	printf("Producer produces item %d\n",x);
	++mutex;
}

void consumer()
{	
	--mutex;
	--full;
	++empty;
	printf("Consumer consumes item %d\n",x);
	x--;
	++mutex;
}
int main()
{
	int n, i;
	printf("\n1.Producer\n2.Consumer\n3.Exit");
	for (i = 1; i > 0; i++)
	{
		printf("\nEnter your choice:");
		scanf("%d", &n);
		switch (n)
		{
			case 1:
				if ((mutex == 1) && (empty != 0))
					producer();
				else 
					printf("Buffer is full!\n");
				break;
			case 2:
				if ((mutex == 1) && (full != 0)) 
					consumer();
				else 
					printf("Buffer is empty!\n");
				break;
			case 3:
				exit(0);
				break;
		}
	}
}