The Player destructor doesn't have much to do as a lot of the cleanup is done during the normal shutdown routines. Here the Player merely deletes all sub-sessions it owns.

MultiTool function to return the current session proxy for a session, but also to create it if it doesn't exist. This avoids having the same pattern in multiple places where we first check to see if it exists then creates it if not.

Panic the client in response to an operation on an existing subsession, after which the request mustn't be completed

Panic the client in response to an operation on an existing subsession, after which the request mustn't be completed

This version allows panic categories to be passed in to support expected legacy behaviour.

Walk through all of the subsessions, telling each to complete all blocked requests with KErrServerAbort. We don't attempt to free them - although with a shared heap this could reduce the amount of leakage it seems likely that the more we do with these data structures, the greater the risk that the contagion spreads to other users of the heap. Clients that attempt almost any further operation after KErrAbort will get panicked by the Dealer in the usual bad handle way - this is harsh but fair, and better than simply leaving them hung.

If an incoming shutdown request is of type EImmediate, informs the Worker Thread that Player shutdown is complete, otherwise do nothing here.