SHARED RESOURCE USING NETWORK DEVICE AND METHOD FOR ACQUIRING SHARED RESOURCE OCCUPATION RIGHT

摘要

PURPOSE: To acquire occupation right even for an occupation right request command having low priority order without being unreasonably waited for a long time in the case of acquiring occupation right for using a shared resource by each system out of plural systems connected like a ring through a communication line. ;CONSTITUTION: When a system 3A requires to obtain occupation right, an occupation right requesting part 4A issues an occupation right request command provided with priority order. The priority order is previously determined in accordance with an application program to be driven. Another system receiving the command compares its own priority order with that of the received command when the application program whose occupation right is requested exits in the system itself, and if its own priority order is lower, sends the received occupation right request command to the succeeding system. When the priority order of itself is higher, the system connects the received command to a queue and sends its own occupation right request command to the succeeding system. The priority order of the occupation right request command connected to the queue is increased and sent corresponding to the connected time. Thereby the command can easily be sent to the succeeding system.;COPYRIGHT: (C)1995,JPO