Counting EX

olb.h

void eastbound_car() {
    printf("Eastbound Car (PID: %d) spawned\n", getpid());
    // Get the Semaphore set
    int sem_set_id = semget(SEM_KEY, NUM_SEMS, 0777);
    // Get the Shared Memory
    struct common *my_shared;
    int shm_id = shmget(SHM_KEY, 0, 0);
    my_shared = (struct common *)shmat(shm_id, 0, 0);
    printf("Cars crossed: %d\n", my_shared->xed_count);
    printf("Bridge Direction: %d\n", my_shared->bridge_dir);
    ...
}

output:

Eastbound Car (PID: 42188) spawned
Cars crossed: 0
Bridge Direction: 0
Eastbound Car (PID: 42188) is crossing the bridge


Eastbound Car (PID: 42188) spawned
Cars crossed: 1
Bridge Direction: 1
Eastbound Car (PID: 42188) is crossing the bridge


Westbound Car (PID: 42188) spawned
Cars crossed: 2
Bridge Direction: 1
Westbound Car (PID: 42188) is crossing the bridge

...