Question

I have a multi-threaded program and cannot figure out why the printf does not work as expected.

This is my code:

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

void *Msg(void *arg)
{
        pthread_t x;
        x= pthread_self();
        printf("x=%ld\n", x);
        printf("This MSG from a thread \n");
        pthread_exit((void*)0);
}



int main()
{
    pthread_t n;
    pthread_create(&n, NULL, Msg, NULL);
    pthread_create(&n, NULL, Msg, NULL);
    printf("Mother thread\n");
        return 0;
}

My question is why it doesn’t printf the sentence “This MSG…”.

Answer 1

You should join the threads to give them a chance to run before the main thread exits. When one thread exits the process all the other threads are killed.

Try:

pthread_join(n, NULL);
return 0;