| 摘要 |
PROBLEM TO BE SOLVED: To provide a device control method for constructing a stable system capable of simply and efficiently using ports without causing the erroneous reception of messages. SOLUTION: A device driver task for directly controlling a device and two or more client tasks for requesting control to the device are included. The device driver task and the client tasks transmit and receive the messages by using plural general purpose ports composed of a virtual interface. When the client task transmits and receives the message with the device driver task, the general purpose port not in use at present is allocated from the plural general purpose ports to the client task.
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