System and methods for improved file management in a multi-user

Details System and methods for improved file management in a multi-user System and methods for improved file management in a multi-user

1996-07-16

1997-11-25

Black, Thomas G.

395477, 395414, G06F 1200

Patent

active

056921780

ABSTRACT:
A computer system having concurrently shared objects or resources is described. An exemplary embodiment includes a multi-user database management system having information tables and related objects stored in shared directories on a file server. A plurality of lock types, including directory lock, full lock, write lock, prevent full lock, and prevent write lock, are provided for controlling concurrent access. Methods are described for managing locks by creating a special lock file for each shared directory that is accessed. The lock file stores at least one logical lock file having locking or concurrency information specific to a family of related members. The logical lock file itself includes a plurality of entries for specifying concurrency information of associated family members. A shared object or resource is accessed according to the information retrieved from the corresponding logical lock file.

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