Exclusive control system for shared memory between plural systems

PURPOSE: To attain more efficient exclusive control by previously determining a system for managing the updating of a shared memory, and simultaneously with the start of updating processing, transferring exclusive control information to an updating management system. CONSTITUTION: Respective systems HOST1, HOST2 are respectively constituted of user application programs UAP1, UAP2 for accessing a shared data base(DB) C-1, DB accessing parts A-1, A-2 for attaining DB accessing, and DB distriibuting function parts B-1, B-2 for attaining transaction processing applied between plural systems. The HOST 1 is connected to the HOST 2 through a high-speed = bus such as a channel. In this case, a data updating system in the shared memory is previously determined, and simultaneously with the starting of a UAP for updating the shared memory, exclusive control information is transferred to the data updating system to execute the exclusive control of the memory. COPYRIGHT: (C)1993,JPO&Japio