Computer network with shared memory using bit maps including flags to indicate reserved memory areas and task status

摘要

The present invention offers an improved type of shared memory area management system for use in a network system which includes a main computer accessed through a plurality of terminals and a memory area provided in said main computer the use of which is shared by said terminals, wherein the memory area is divided into a plurality of delimited areas, and wherein are provided a first bit map and a second bit map each including a plurality of flag areas corresponding to the delimited areas and adapted to show the state of shared use of the areas in such a manner that, when it is necessary to reserve or release any one of the delimited areas for processing a task by way of any one of the terminals, the state of a corresponding flag area in the first bit map may be changed, and that when such task in the delimited area is determined to be completed, the state of corresponding flag area in the second bit map may be changed accordingly.