#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#define num_loops	2000000
void *functionC (void* ptr) ;
pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER ;

int sum = 0 ;
int main ()
{
	int rc1 , rc2 ;
pthread_t thread1 , thread2 ;
int value1 = 1 ;
int value2 = -1;

rc1 = pthread_create(&thread1, NULL , &functionC, (void*) value1);
rc2 = pthread_create(&thread2, NULL , &functionC, (void*) value2);

pthread_join(thread1, NULL);

pthread_join(thread2, NULL);
printf("counter value = %d\n", sum);
exit(0);


}
void *functionC (void*ptr)
{

int ctr = (int*)ptr;
int i ;
pthread_mutex_lock(&mutex1);
}