A lock for managing shared resources in a data processing system enables a requesting processor, in a signal atomic transaction, to validate the main lock data structure, request a lock, take the lock and establish a lock mode if successful, or establish its place in a queue of requesters for subsequent locks on the shared resource if unsuccessful. The clutch arrangement has a clutch and an actuator arrangement. The method also includes measuring a parameter indicative of a pressure of the coolant and adjusting the pressure of the coolant in response to control the cooling of the heat-generating structure. In another aspect, a UE attached to the second BS receives at least control information on the PCC of the first BS and receives data on the PCC of the second BS.