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US Patent 5805900 - Method and apparatus for serializing resource access requests in a multisystem complex
US Patent Issued on September 8, 1998
Estimated Patent Expiration Date:
September 26, 2016Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
September 26, 2016Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA method and apparatus for serializing a request for access to a resource originating from a requester in a system of a multisystem complex. Each system of the complex maintains local contention data indicating contention between requesters on that system for access to the resource, as well as a local contention summary summarizing the local contention data. A global manager for managing contention between the systems uses the local contention summaries to determine the existence of global contention for the resource. In response to a request for access to the resource originating from a requester on a system, the system determines whether the request requires an update of the local contention summary for the system. If the request does not require an update of the local contention summary, the system processes the request in accordance with the local contention data for the system. If the request does require an update of the local contention summary, the system notifying the global manager of the update and processing the request in accordance with the response received from the global manager.Other References
| Inventors
ApplicationNo. 717998 filed on 09/26/1996US Classes:710/220, ACCESS POLLING707/8, Concurrency (e.g., lock management in shared database)710/112, Bus request queuing710/200ACCESS LOCKINGExaminersPrimary: Sheikh, Ayaz R.Assistant: Phan, Raymond N Attorney, Agent or FirmUS Patent References4965719, Method for lock management, page coherency, and asynchronous writing of changed pages to shared external store in a distributed computing systemIssued on: 10/23/1990 Inventor: Shoens, et al.5175852, Distributed file access structure lock Issued on: 12/29/1992 Inventor: Johnson, et al.5202971, System for file and record locking between nodes in a distributed data processing environment maintaining one copy of each file lock Issued on: 04/13/1993 Inventor: Henson, et al.5226159, File lock management in a distributed data processing system Issued on: 07/06/1993 Inventor: Henson, et al.5327556, Fast intersystem page transfer in a data sharing environment with record locking Issued on: 07/05/1994 Inventor: Mohan, et al.5339427, Method and apparatus for distributed locking of shared data, employing a central coupling facility Issued on: 08/16/1994 Inventor: Elko, et al.5410697, Concurrency management using version identification of shared data as a supplement to use of locks Issued on: 04/25/1995 Inventor: Baird, et al.5423044, Shared, distributed lock manager for loosely coupled processing systems Issued on: 06/06/1995 Inventor: Sutton, et al.5442763, System and method for preventing deadlock in multiprocessor multiple resource instructions Issued on: 08/15/1995 Inventor: Bartfai, et al.5454108, Distributed lock manager using a passive, state-full control-server Issued on: 09/26/1995 Inventor: Devarakonda, et al.5537574, Sysplex shared data coherency method Issued on: 07/16/1996 Inventor: Elko, et al.5551046, Method for non-hierarchical lock management in a multi-system shared data environment Issued on: 08/27/1996 Inventor: Mohan, et al.5596754, Method for performing private lock management Issued on: 01/21/1997 Inventor: Lomet5613139, Hardware implemented locking mechanism for handling both single and plural lock requests in a lock message Issued on: 03/18/1997 Inventor: Brady5634122, System and method for multi-level token management for distributed file systems Issued on: 05/27/1997 Inventor: Loucks, et al.5682537, Object lock management system with improved local lock management and global deadlock detection in a parallel data processing system Issued on: 10/28/1997 Inventor: Davies, et al.5734909Method for controlling the locking and unlocking of system resources in a shared resource distributed computing environment Issued on: 03/31/1998 Inventor: Bennett Foreign Patent References
International ClassesG06F 009/46G06F 013/14 608 671 672 674 675 677 200.42-200.47 292 |
