Fujitsu Corporation

Masatoshi Michizono

Toshiyuki Muta

Yasutomo Sakurai

Koichi Odahara

Shinya Katoh

An information processing apparatus includes a memory and a processor. The memory is configured to store first authority information, the first authority information including information for specifying a hardware resource, the first authority information being used for determining whether or not to permit operation of the hardware resource. The processor is coupled to the memory. The processor is configured to perform accepting a request for transmitting the first authority information to a destination apparatus, determining, in response to the request, whether second authority information is set or not, the second authority information being used for making a copy feasibility determination of the first authority information, transmitting the first authority information to the destination apparatus together with the second authority information when the second authority information is set and deleting the second authority information set in the transmitted first authority information.

Apparatus and system for managing authority information to permit operation of hardware resource

A round robin arbitration circuit arbitrating N requests has a register storing one of N values, a priority encoder selecting one of N priority patterns according to the value in the register and assigning priorities to the requests based on the selected priority pattern, thereby conducting arbitration between the requests, a circuit updating the value in the register among the N values in a predetermined order synchronously with the arbitration, and a circuit updating the value in the register among the N values in the predetermined order at regular intervals that are asynchronous with the arbitration. At the regular intervals that are asynchronous with the arbitration, a jump is made in the predetermined updating order of the values to be set in the register. Accordingly, even if live-lock occurs, it will be solved when such a jump is made to make the number of priority patterns disagree with the number of requests issued in a loop.

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Yokohama, Japan

Masatoshi Michizono