Boots – shoes – and leggings
Patent
1993-05-06
1996-10-15
Gossage, Glenn
Boots, shoes, and leggings
395477, 395479, 395472, 395490, 39520008, 395726, 364134, 364DIG1, G06F 1314, G06F 1300
Patent
active
055663192
ABSTRACT:
A system and method for controlling access to data in storage which is shared by a plurality of processors are disclosed. The shared storage is located outside of main storage of each of the processors and stores a lock file. The lock file comprises a plurality of control fields containing access administration information (ZVI) authorizing the processors to access the data when not currently being accessed by another processor and a status identification code (SKC) to indicate the status of the access administration information. In response to a data access request from one of the processors, the status identification code provided by the processor is compared to the stored status identification code. If the comparison indicates that the requesting processor is authorized to update the access administration information, the access administration information associated with the requesting processor for the type of data access request is written from the requesting processor to the shared storage without first reading the stored access administration information from the lock file. The status identification code in the storage is updated to indicate that the processor has updated the access administration information.
REFERENCES:
patent: 4965719 (1990-10-01), Shoens et al.
patent: 5230070 (1993-07-01), Liu
"Enterprise Systems Architecture/390: System/360 and System/370 I/Interface Channel to Control Unit Original Equipment Manufacturers Information," IBM Corp. (DA3AR110 GA22-6974-10), copyright 1971, '78, '81, '83, '84, '87 and '92.
"Storage Subsystem Library: IBM 3990 Storage Control Reference," IBM Corp. (A13R1000 GA32-0099-05), copyright 1988, 1993.
Enterprise Systems Architecture/390 "Principles of Operation," IBM Corp. (SA22-7201-00), copyright 1990.
ACM Transactions on Computer Systems, Bd. 9, No. 1, Feb., 1991, pp. 21-65, "Algorithms for Scalable Synchronization on Shared-Memory Multiprocessors", by Mellor-Crummey et al.
Gossage Glenn
International Business Machines - Corporation
Samodovitz Arthur J.
LandOfFree
System and method for controlling access to data shared by a plu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for controlling access to data shared by a plu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for controlling access to data shared by a plu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1254328