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

void firstThread(int *);
void secondThread(int *);
static char rcsid[] = 
        "$Id: index.html,v 1.6 2005/05/18 00:02:55 rcampos Exp rcampos $";

int main(void)
{
        pthread_t t1, t2;
        int argt1 = 0, argt2 = 0;
        int rc; 

        /* int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
                           void *(*start_routine)(void *), void *arg); */

        /* Create first thread, rc will hold the return code for pthread_create */
        rc = pthread_create(&t1, NULL, (void *)firstThread, (void *) &argt1);


        /* pthread_create should return 0, otherwise something is wrong */
        if (rc != 0)
        {
                perror("main: error creating first thread");
                exit(1);
        }
        


        /* Create the secod thread, same as above only changing some parameters */
        rc = pthread_create(&t2, NULL, (void *)secondThread, (void *) &argt2);

        if (rc != 0)
        {
                perror("main: error creating second thread");
                exit(1);
        }


        /* int pthread_join(pthread_t thread, void **value_ptr); */

        /* Wait for the first thread to finish */
        rc = pthread_join(t1, NULL);
        if (rc != 0)
        {
                perror("main: error joining first thread");
                exit(1);
        }
        else
        {
                printf("main: first thread returned successfully\n");
        }


        /* Wait for the second thread to finish */
        rc = pthread_join(t2, NULL);
        if (rc != 0)
        {
                perror("main: error joining second thread");
                exit(1);
        }
        else
        {
        printf("main: second thread returned successfully\n");
        }


        printf("main: argt1 = %d, argt2 = %d\n", argt1, argt2);

        return 0;
}

void firstThread(int *arg)
{
        /* This routine adds 30 to a given arg */
        pthread_t myId;
        int i;

        myId = pthread_self();

        printf("firstThread: my ID is %d\n", myId);

        (*arg) += 30;
}
                


void secondThread(int *arg)
{
        /* This routine subtracts 10 from a given arg */
        pthread_t myId;
        int i;

        myId = pthread_self();

        printf("secondThread: my ID is %d\n", myId);

        (*arg) -= 10;
}