PROGRAM SUBJECT : USE OF CALLBACK FUNCTION & THREAD STATUS MONITORING AND FLAG MECHANISM. WHEN DEAL WITH THREAD CALLBACK FUNCTION IS MORE USEFUL WHEN COMMON FUNCTION SHARING BETWEEN MULTI THREAD SYSTEM. THREAD STATUS MONITORING AND FLAG MECHANISM PROVIDE EFFICIENT WAY FOR COMMUNICATION BETWEEN DIFFERENT PROCESS. // CREATED BY : JAYDEEP SHAH -- radhey04ec@gmail.com