无限循环实际上停止使用线程

Question

I'm new to C and I am trying to learn. I'm trying to implement multithreading in my program, but I'm having problems. The program (and the threads) should be going on running in a infinite loop, but actually the programs stops after few seconds. What can I do for having the program running forever? Am I doing something wrong?

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


void *func(void *threadid){
    while (1)
    {
        /* do stuff, but the program terminates after that thread does few cycles */
    }
}

int main(){
    #define NUM_THREADS 800
    pthread_t threads[NUM_THREADS];
    int rc, i;
    for (i=0; i < NUM_THREADS; i++)
    {
        rc = pthread_create(&threads[i], NULL, func, (void *)i);
        if (rc)
        {
            printf("Error to create thread, #%d\n", rc);
            exit(-1);
        }
    }
    pthread_exit(NULL);
}

Answer 1

As soon as your main thread exits, the program terminates (and so do the threads). If you want your program to never end, you should add a while(1); at the end of you main while loop.

Note that this is not how to do it properly, your threads should have an end, and the master thread should wait for all the threads to be done, before exiting itself.