simple-pthreads.c

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

void * print_message(void *);

int main(void) {
  pthread_t thread_1;
  pthread_t thread_2;

  const char * message_1 = "Thread 1";
  const char * message_2 = "Thread 2";

  int thread_1_ret;
  int thread_2_ret;

  thread_1_ret = pthread_create(
    &thread_1,
    NULL,
    print_message,
    (void *) message_1
  );

  thread_2_ret = pthread_create(
    &thread_2,
    NULL,
    print_message,
    (void *) message_2
  );

  pthread_join(thread_1, NULL);
  pthread_join(thread_2, NULL);

  printf("Thread 1 returns: %d\n", thread_1_ret);
  printf("Thread 2 returns: %d\n", thread_2_ret);

  return 0;
}

void * print_message(void * param) {
  char * message;

  message = (char *) param;

  printf("%s \n", message);
}