call_exit.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
 
void *thread(void *arg)
{
    pthread_t newthid;
         
    newthid = pthread_self();
    printf("this is a new thread, thread ID = %ld\n", newthid);

    // 子线程休眠10秒,由于主线程调用exit,导致进程结束,子线程也会结束
    sleep(10);

    return NULL;
}
 
int main(void)
{
    pthread_t thid;
         
    printf("main thread ,ID is %ld\n", pthread_self());
    
    if (pthread_create(&thid, NULL, (void *)thread, NULL) != 0) {
        printf("thread creation failed\n");
        exit(1);
    }

    // 主线程调用exit
    exit(0);

    return 0;
}