Operating System- Counting semaphore and binary semaphore

This video is about the concept of semaphore which is an operating system type solution, it uses system call WAIT() or down()or p(s) and SIGNAL() or up()or v(s),where wait() decrements and signal increments. Counting semaphore has -infinte to + infinite values and is used for controlled access to resources. Binary semaphores has only 2 values 0 and 1, it is used for Mutual Exclusion also called MUTEX. Mutex is used when process want to access critical section , BS=1 critical section is free and BS=0 critical section is busy.