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Can someone please explain me why we need nested locking ?
look at this example :
lock (locker)
lock (locker)
lock (locker)
{
...
}
can someone please explain (+ example will be much appreciated).
It is only an issue because you might have nested (eg mutually recursive) calls to methods that need to lock. Those methods must allow being called with the resource already locked but they can not depend on it. So nested locking is allowed, not needed.
The code you posted (and the book you refer to) show how it works by reducing it to an inline scenario. That is not ‘real’ code.
The simple rule is that a thread that already owns a lock can lock it again and that the number of Exits must match the number of Enters to release the lock.