程序代码：

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

void *functiony( void *ptr );
void *functionx( void *ptr );

int a, b, c;
main()
{
     pthread_t thread1, thread2;
     char *message1 = "Thread 1";
     char *message2 = "Thread 2";
     int  iret1, iret2;

    /* Create independent threads each of which will execute function */

     iret1 = pthread_create( &thread1, NULL, functiony, (void*) message1);
     iret2 = pthread_create( &thread2, NULL, functionx, (void*) message2);

     /* Wait till threads are complete before main continues. Unless we  */
     /* wait we run the risk of executing an exit which will terminate   */
     /* the process and all threads before the threads have completed.   */

     pthread_join( thread1, NULL);
     pthread_join( thread2, NULL);

     printf("\nThread 1 returns: %d\n",iret1);
     printf("Thread 2 returns: %d\n",iret2);
     printf("c = %d\n",a+b);
     exit(0);
}

void *functiony( void *ptr )
{
     char *message;
     message = (char *) ptr;
     printf("%s \n", message);
     a=1;
     while(a<=99)
     {
        printf("/");
        a++;
     }
}

void *functionx( void *ptr )
{
     char *message;
     message = (char *) ptr;
     printf("%s \n", message);
     b=1;
     while(b<=99)
     {
        printf(".");
        b++;
    }
}