Untitled

#include <stdio.h>

int mutex = 1, full = 0, empty = 5, x = 0;

void producer();
void consumer();
int wait(int);
int signal(int);

int main() {
    int n;

    printf("\n1. Producer\n2. Consumer\n3. Exit\n");
    while(1) {
        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:
                return 0;
            default:
                printf("Invalid choice\n");
                break;
        }
    }
    return 0;
}

int wait(int s) {
    return (--s);
}

int signal(int s) {
    return (++s);
}

void producer() {
    mutex = wait(mutex);
    full = signal(full);
    empty = wait(empty);
    x++;
    printf("Producer produces item %d\n", x);
    mutex = signal(mutex);
}

void consumer() {
    mutex = wait(mutex);
    full = wait(full);
    empty = signal(empty);
    printf("Consumer consumes item %d\n", x);
    x--;
    mutex = signal(mutex);
}