thread_function.c

// thread_function.c
// gcc -o thread_function thread_function.c

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

void* thread_function(void) {
 char *a = malloc(10);
 strcpy(a,"<Hello World>");
 pthread_exit((void*)a);
}

int main() {
 pthread_t thread_id;
 char *b;
 pthread_create (&thread_id, NULL,&thread_function, NULL);
 // Here we are reciving one pointer value. Thus, we need double pointer:
 pthread_join(thread_id,(void**)&b);
 printf("b is %s\n",b);
}