thread c aviao

#include "stdio.h"
#include "unistd.h"
#include "stdlib.h"
#include "pthread.h"

#define AV 3

pthread_mutex_t lock_pista = PTHREAD_MUTEX_INITIALIZER;

void * aviao(void * arg) {
    int i = *((int *) arg);
    while(1) {
        printf("%d: voando e vai pousar\n",i);
        sleep(10);
        pthread_mutex_lock(&lock_pista);
        printf("%d: pousando\n",i);
        sleep(2);
        printf("%d: pousou, liberando a pista\n",i);
        pthread_mutex_unlock(&lock_pista);
        sleep(5);

        printf("%d: querendo decolar\n",i);
        sleep(10);
        pthread_mutex_lock(&lock_pista);
        printf("%d: decolando\n",i);
        sleep(2);
        printf("%d: decolou, pista liberada\n",i);
        pthread_mutex_unlock(&lock_pista);
        sleep(5);
    }
}

int main() {

    pthread_t a[AV];

    int i,*id;

    for (i=0;i<AV;i++) {
        id = (int *) malloc(sizeof(int));
        *id = i;
        pthread_create(&a[i], NULL, aviao, &i);
    }

    pthread_join(a[0], NULL);
    return 0;
}