MANAGEMENT SYSTEM FOR SHARED DEVICE OF LOOSE COUPLING PLURAL SYSTEMS

PURPOSE:To automatically change the state of a total constitution system according to a request from a self-system without stopping other system by referring to a communication status table when a response result does not succeed to search a system in which a request processing already succeeds and requesting for canceling the request processing to the system. CONSTITUTION:In a processing program 5, it is decided from which system the response comes by a response decision means 3 to update the communication status table 4 and decides the responses from respective object hosts. After the response is decided, at the time of a response of succeeding in the processing, a system state change in the hosts B, C is completed according to a request from the host A, so that a processing program 5 changes the state in the host A by a self-host request processing means 10 to complete the state change relating to a covalent device 19 in loose coupling systems A-C. However, when the processing does not succeed, the communication status table 14 is referred and when there is the system receiving the information of the success, a request processing for returning the requested state change processing to an original state is carried out by a request processing cancel means 14.