| 摘要 |
PURPOSE:To make a limited resource effective, and to operate another process as well without finishing its own process by securing only a necessary memory during the execution of overlay. CONSTITUTION:A process control means 1 is a control means for executing the overlay, and it takes out the bus structure 9 of an overlaying part from a process control table 5, and sets it to memory size 11 required for this bus. At this time, a position to be set becomes of the same name as the names of the bus ID 8 of the table 5 and the bus ID 10 of a memory control table 6. Next, the means 1 investigates whether the memory size of a maximum value among the memory sizes 11 of the table 6 can be secured or not from system configuration, and when it can be secured, it transfers the control to a process executing means 2, and when it can not be secured, it returns an error, The means 2 is the means to load the bus to be overlaid actually to the memory and makes it execute, and when the bus ID 8 of the table 5 is designated, it calls an area securing means 3.
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