| 摘要 |
PURPOSE:To allow a task with the highest priority to always acquire a memory by permitting the acquisition of a storage area only when the size of an unused area of the memory is larger than acquisition reference data previously determined in each processing. CONSTITUTION:Reference residual data (data indicating the size of an unused area to be secured in a common memory 81 at the time of acquiring the common memory 81) previously determined in each processing are stored in a reference residual table 82 of a RAM 8. When the acquisition of the storage area of the common memory 8 required for processing is requested, the reference residual data stored in the table 82 and corresponding to the processing concerned are compared with the size of the unused area of the common memory 81, and only when the size of the unused area of the memory is larger, the acquisition of the storage area is permitted. When the minimum reference residual data are set up on the processing with highest priority, a task with the highest priority can always acquire the memory. |
