Compare and contrast the use of monitors and semaphore operations.

What will be an ideal response?

Monitors use the important system structuring technique of information hiding; clients of a monitor cannot directly access its variables, nor can clients access the internal monitor procedures. The client’s view of the monitor is simply that of an abstract object. Semaphores are a much lower level means of enforcing thread synchronization and mutual exclusion. In fact, monitors can be constructed with semaphores, thus they are at least as powerful as semaphores.