Loading patent…
AssigneeInternational Business Machines Corporation
InventorsRavi Kumar Arimilli, John Steven Dodson, Jody B. Joyner, Jerry Don Lewis
Estimating the term…
Serialization of global operations within a multiprocessor system is achieved utilizing a single token, requiring a bus master to acquire the token for completion of each individual global operation initiated by that bus master. A combined token and operation request, in which a token request and an operation request are transmitted in a single bus transaction, is employed once for a global operation, to initiate the global operation for the first time. A token manager determines whether the token is available or checked out and responds to the token portion of the combined request. Snoopers respond to the operation portion of the combined request depending on whether they are busy. If the entire combined request is retried, a token request (only) is employed to request the token and, when the token is acquired, an operation request (only) is employed to request the operation. If the token portion of the combined request is acknowledged but the operation portion is retried, an operation request (only) is transmitted. If the entire combined request is acknowledged or once a subsequent operation request is acknowledged, which implies release of the token, the operation is treated as completed. Snoopers speculatively process the operation for the combined request if not busy. The token manager allows only one bus master to own the token at a time, and infers release of the token from a combined response acknowledging a combined request or an operation request.
A method of enabling global operations within a multiprocessor system, comprising:
A bus protocol for global operations within a multiprocessor system, comprising:
A method of serializing global operations within a multiprocessor system, comprising:
A system for serializing global operations within a multiprocessor system, comprising:
Dependencies are inferred from the claim text.