IFSMgr_BlockNoEvents( unsigned long key )
This service has been provided for FSDs to block a thread. This service does not return until the corresponding wake call has been issued on the blocked key via the IFSMgr_Wakeup service. The important difference between this service and the IFSMgr_Block service is that this service blocks with events disabled. FSDs that use this service must be very careful about when they use this service to prevent the possibility of deadlocks occurring in the system.
key
Suppplies unique identification for the caller of the service. Usually, the address of the appropriate structure itself is passed in as the key so that a wakeup request can be matched with the block request.