thread1

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

int a = 10;

void *mythread1(void *dummy)
{

   pthread_t mythid;

   mythid = pthread_self();

   a += 10;

   printf("Thread %lu, result = %d\n", mythid, a);

   return NULL;
}



void *mythread2(void *dummy)
{

   pthread_t mythid;

   mythid = pthread_self();

   a *= 3;

   printf("Thread %lu, result = %d\n", mythid, a);

   return NULL;
}

void *mythread3(void *dummy)
{

   pthread_t mythid;

   mythid = pthread_self();

   a %= 7;

   printf("Thread %lu, result = %d\n", mythid, a);

   return NULL;
}

int main()
{
   pthread_t thid1, thid2, thid3;

   int result1 = pthread_create (&thid1, (pthread_attr_t *)NULL, mythread1, NULL);
   if(result1 != 0) { printf ("Error on thread create, return value = %d\n", result1); exit(-1); }
   printf("Thread has been created, thid = %lu\n", thid1);

   int result2 = pthread_create( &thid2, (pthread_attr_t *)NULL, mythread2, NULL);
   if(result2 != 0) { printf ("Error on thread create, return value = %d\n", result2); exit(-1); }
   printf("Thread has been created, thid = %lu\n", thid2);

   int result3 = pthread_create( &thid3, (pthread_attr_t *)NULL, mythread3, NULL);
   if(result3 != 0){ printf ("Error on thread create, return value = %d\n", result3); exit(-1); }
   printf("Thread has been created, thid = %lu\n", thid3);

   pthread_join(thid1, (void **)NULL);
   pthread_join(thid2, (void **)NULL);
   pthread_join(thid3, (void **)NULL);

   return 0;
}