How to use this for killing array of threads?

#include<stdio.h>
#include<signal.h>
#include<pthread.h>

void *print1(void *tid) 
{
    pthread_t *td= tid;
    pthread_mutex_t lock1=PTHREAD_MUTEX_INITIALIZER;
    pthread_mutex_lock(&lock1);
    printf("1");
    printf("2");
    printf("3");
    printf("4\n");
    printf("Coming out of thread1 \n");
    sleep(2);
    pthread_mutex_unlock(&lock1);
    pthread_kill(*td,SIGKILL);//killing remaining all threads 
    return NULL;
}
void *print2(void *arg) 
{
    pthread_mutex_t *lock = arg;
    pthread_mutex_lock(lock);
    sleep(5);        
    printf("5");
    sleep(5);
    printf("6");
    sleep(5);
    printf("7");
    sleep(5);
    printf("8\n");
    fflush(stdout);
    pthread_mutex_unlock(lock);
    return NULL;
}
int main() 
{
    int s;
    pthread_t tid1, tid2;
    pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
    printf("creating Thread 1and 2 \n");
    sleep(2);
    pthread_create(&tid1, NULL, print1,&tid2);
    pthread_create(&tid2, NULL, print2,&lock);
    printf("Running Thread 1\n");
    sleep(2);
    pthread_join(tid1, NULL);
    pthread_join(tid2, NULL);
    return 0;
}