Method for controlling access to a shared file and apparatus the

Details Method for controlling access to a shared file and apparatus the Method for controlling access to a shared file and apparatus the

1990-11-15

1994-03-08

Shaw, Gareth D.

Boots, shoes, and leggings

364DIG1, 3642466, 3642281, 36424341, G06F 700, G06F 720, G06F 704

Patent

active

052936180

ABSTRACT:
In an information processing system including a file shared by computer systems each having a central processing system and a main memory, a method for controlling access to the shared file includes a step of storing blocks read from the file into the main memory when the blocks of the file are updated, and a step of comparing at least a portion of the blocks held in a cache memory with at least a portion of the blocks stored in the main memory. When the comparison of at least the portion of the blocks held in the cache memory with at least the portion of the blocks stored in the main memory indicates mismatching, the block is read from the file into the main memory, and when the comparison indicates matching, the block of the main memory is updated. The data to be updated may be in a resident area, an input/output buffer or a same area.

REFERENCES:
patent: 4823310 (1989-04-01), Grand
patent: 4897782 (1990-01-01), Bennett et al.
"DASD sharing with other systems", Manual for Programmer of Hitachi Program Product VOS 3/ES System, 1988, pp. 97-104.

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