File updating method capable of updating an operation file without interrupting online processing

摘要

An input/output control device (11) comprises a dual processor system. Supplied with a file update request, first and second processors (12, 14) perform individual processing independently of each other. While the first processor (12) processes a processing request from an input/output device (18) with a current operation file, a new operation file is loaded from a storage medium (17) to a second memory (15). At a predetermined timing, input/output control is switched from the first processor (12) to the second processor (14). Thereafter, judgement is made about whether or not a new processing request subsequently received is an existing call already triggered in the current operation file or a new call newly triggered. In case of the existing call, the call is transmitted through a data transmission/reception unit (16) to the first processor (12) to perform processing with the current operation file. In case of the new call, the processing is performed with the new operation file to produce a processed output. After completion of all processing about the existing call, the content of the second memory (15) is copied into a first memory (13).