In multi-threaded applications, a non-negative number, known as a semaphore, is shared between threads that have a number of 1 or 2. In terms of synchronization, 1 specifies wait and 2 specifies signal.We can associate a semaphore with a number of buffers, which can each be worked on simultaneously by different processes.
So, essentially, semaphores are signaling mechanisms of the integer and binary primitive types that can be modified by wait and signal operations. If there are no free resources, then processes that require a resource should execute the wait operation until the semaphore value is greater than 0. Semaphores can have multiple program threads and they can be changed by any object, obtaining a resource or releasing it.
The advantages of using semaphores are down to the fact that more than one thread can access the critical piece of code. A semaphore is executed in the kernel and is machine-independent...
