System for alotting logical path number to logical interfaces an

Details System for alotting logical path number to logical interfaces an System for alotting logical path number to logical interfaces an

1997-05-08

1999-07-20

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral monitoring

710 8, 710 21, 710 38, G06F 1300, G06F 1314

Patent

active

059251115

ABSTRACT:
Disclosed is an exclusive control method in an I/O subsystem having an exclusive controller which is provided with an exclusive control table and which permits a host interface to use the I/O device when the I/O device is not used by any other host interface while prohibiting the use when another host interface is using the I/O device. The method comprises the steps of: allotting a logical path number to each of the host interfaces of each of the input/output interface portions; judging whether or not the I/O device is being used by another host interface by reference to the exclusive control table when a request for use of the I/O device is input from a host interface to which a predetermined logical path number is allotted; permitting the host interface which has required for access to use the I/O device when the I/O device is not in use, while setting a flag indicating that the I/O device is "Occupied" in the exclusive control table in correspondence with the allotted logical path number; and changing the flag to a flag indicating that the I/O device is "Vacant" when the use of the I/O device is finished.

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