Boots – shoes – and leggings
Patent
1992-06-04
1993-07-06
Shaw, Gareth D.
Boots, shoes, and leggings
395200, 364DIG1, 3642468, 3642816, 3642824, G06F 1300, G06F 1216
Patent
active
052261590
ABSTRACT:
A distributed data processing system and method in which locks on a file are supported by a data structure that resides on either a client machine or on the file's server. When only a single client's processes are locking a file, the data structure can reside on that client. Whenever a plurality of client machines attempt to place locks on a file, the data structure is moved to the server; this forces the clients locking the file to communicate with the server when performing lock operations. When a client requests a lock from the server that cannot be granted because of an existing blocking lock, the client is informed that it should put the requesting process asleep awaiting a retry notification. When there is a change in the locks on the file that might allow such a client's now sleeping process to acquire the lock, the server sends a retry notice to the client. This awakens the sleeping process at the client, and the process then reattempts the lock operation by sending a message to the server.
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Henson Larry W.
Johnson Donavon W.
Morgan Stephen P.
Smith Todd A.
Chaki Kakali
International Business Machines - Corporation
Lefeve Douglas H.
Shaw Gareth D.
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