#include <pthread.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

int value = 0;
void *runner(void *param);

int main(int argc, char *argv[]) {
  pid_t pid;
  pthread_t tid;
  pthread_attr_t attr;

  pid = fork();

  if (pid == 0) {
    pthread_attr_init(&attr);
    pthread_create(&tid, &attr, runner, NULL);
    pthread_join(tid, NULL);
    printf("CHILD: value = %d\n", value);
  } else if (pid > 0) {
    wait(NULL);
    printf("PARENT: value = %d\n", value);
  }
}

void *runner(void *param) {
  value = 5;
  pthread_exit(0);
}