#include <stdlib.h>

   ……

int val;

int main() {

val = 1;

fork();

val = val + 1;

printf("%d\n", val);

}

#include <stdlib.h>

#include <pthread.h>

   ……

int val;

int main() {

val = 1;

pthread_t tid; /* the thread identifier */

pthread_create(&tid, NULL, incrementval, NULL);

     

/* wait for the thread to exit */

pthread_join (tid, NULL);

val = val + 1;

printf("%d\n", val);

}

 

/* The thread will begin control in this function */

void * incrementval (void *param)

{

val = val + 1;

printf("%d\n", val);

 

     pthread_exit(0);

}