Question

Choose two statements in context of monitor based synchronization scheme that use condition type variable x:

I: Only wait () and signal () operations can be involved on X.

II: If process p invokes X, wait() operation; then P is suspended until another process invokes X, signal().

III: The X, signal() operation resumes exactly one suspended process and if no process is suspended, the it has no effect.

1. I and II
2. II and III
3. I and III
4. I, II and III

Answer 1

Correct Answer - Option 1 : I and II

The monitor is one of the ways to achieve Process synchronization. The monitor is supported by programming languages to achieve mutual exclusion between processes

Wait operation

wait() : Process performing wait operation on any condition variable are suspended. The suspended processes are placed in block queue of that condition variable.

Signal operation

signal(): When a process performs signal operation on condition variable, one of the blocked processes is given chance.

Hence Option 1 is correct