Answer / nirmalraj

Critical Section comes in single process environment they
didn't share accross process boundary.

In C if you wish to implement criticalsection you have to
use windows datastructure CRITICAL_SECTION and create a
object to access its members.

Initialize it
InitializeCriticalSection(&cs);
------------
-----------
function to call();
------------
DeleteCriticalSection(&cs);
.
.
call()
{
}

Answer / svinto

Now sure what is asked but anyway:
1. If the question is how would you implement critical
section mechanism then the answer is to use a mutex.
2. If the question is to show how to use the critical
section then the following code fragment adresses that:
//
// Global variable or a member of some
// dynamically allocated structure, usualy within
// the data access to which it is protecting.
//
CRITICAL_SECTION cs;

VOID Init(VOID) {
InitializeCriticalSection( &cs );
}

VOID SomeCall(VOID) {
EnterCriticalSection( &cs );
//
// Thread-safe block of code protected by critical
section.
//
LeaveCriticalSection( &cs );
}

VOID
UnInit(VOID) {
DeleteCriticalSection( &cs );
}

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