Method for controlling access to a shared file and apparatus therefor
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United States of America Patent
Stats
-
Mar 8, 1994
Grant Date -
N/A
app pub date -
Nov 15, 1990
filing date -
Nov 18, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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