| 摘要 |
PROBLEM TO BE SOLVED: To maintain consistency in data without delaying process for high priority when a multiple number of flows for control exist and each is operating a shared data. SOLUTION: In the system, effective transaction variable is provided for each data to be operated. At the start of the transaction, a task ID is inserted into the effective transaction variable. Furthermore, when the transaction is started, a renewal record is allotted to a stack. The effectiveness of the renewal record for the data to be operated is judged by whether its own task ID remains in the effective transaction variable or not. When judged effective, the renewal record on the stack is reflected on the data which is to be operated.
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