| 摘要 |
PURPOSE:To shorten the waiting time for a file access, by inputting a data from a file which has become inputtable first among a main system file and a subsystem file. CONSTITUTION:An input/output executing means 7 is started by an input/output control means 4, refers to an input/output queue with respect to a main system input/output queue 8 and a subsystem input/output queue 9, and determines an input required to be executed in the next time. Subsequently, before executing the input request, an input/output queue deleting means 6 is started, whether this input request exists in the input/output queue of the other system or not is decided, and when said request exists, its input request is deleted from the input/output queue of the other system. Thereafter, the input/output executing means 7 executes an input processing to a main system file 12 or a subsystem file 13, by which a data can be inputted from a file which has become inputtable first among a main system file 12 and a subsystem file 13. In such a way, the waiting time for a file access can be decreased remarkably.
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