mutex vs semaphore
 

what is difference between mutex and semaphore?? in which case do we use mutex and in which case we use semaphore??

They are basically the same thing. They are both used to control access to a resource. The main difference is that a mutex is set or not set, where a semaphore is typically assigned an interger n that allows n number of concurrent accesses before access is denied.

There are a bunch of decent guides on mutexes/semaphores. Here is one -->http://www.yolinux.com/TUTORIALS/Lin...ixThreads.html