CODEWITHSUNDEEP
cpthreads
manish ma
manish ma

Reputation: 2028

C Thread runs only once

I want to run some jobs in parallel inside a single process. For some reason the thread I've created runs only once, please help me understand where is my mistake.

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

void * print_thread (void * var)
{
    int *p_var = (int *)var;
    printf("this is a thread %d\n", ++(*p_var));

}

int main()
{
    int x=0;
    pthread_t thread1;


    if(pthread_create(&thread1, NULL, print_thread, &x)) 
    {
        fprintf(stderr, "Error creating thread\n");
        return 1;
    }

    while (1)
    {
        usleep(100000);
    }

    return 0;
}


# gcc -o thread pthread_example.c -lpthread
# ./thread 
this is a thread 1

Upvotes: 0

Views: 1031

Answers (1)

Joe
Joe

Reputation: 7798

You should think of print_thread as your new threads "main". It will run from start to finish and then the thread will exit. Unless you have some kind of loop inside of print_thread, it will never persist.

Upvotes: 2

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