UGC NET CSE | December 2014 | Part 3 | Question: 53

Question

Monitor is an Interprocess Communication $(IPC)$ technique which can be described as 

• A. It is higher level synchronization primitive and is a collection of procedures, variables, and data structures grouped together in a special package.
• B. It is a non-negative integer which apart from initialization can be acted upon by wait and signal operations.
• C. It uses two primitives, send and receive which are system calls rather than language constructs.
• D. It consists of the $IPC$ primitives implemented as system calls to block the process when they are not allowed to enter critical region to save $CPU$ time. 

Answer 1

A. Is ans

monitor is a thread-safe class, object, or module that uses wrapped mutual exclusion in order to safely allow access to a method or variable by more than one thread. The defining characteristic of a monitor is that its methods are executed with mutual exclusion: At each point in time, at most one thread may be executing any of its methods. Using a condition variable(s), it can also provide the ability for threads to wait on a certain condition (thus using the above definition of a "monitor"). For the rest of this article, this sense of "monitor" will be referred to as a "thread-safe object/class/module".

Reference ...wikipedia