File lock management in a distributed data processing system
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United States of America Patent
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Jul 6, 1993
Issued Date -
N/A
app pub date -
Jun 4, 1992
filing date -
May 15, 1989
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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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- 15 United States
- 10 France
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- 7 China
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Patent Owner(s)
- INTERNATIONAL BUSINESS MACHINES CORPORATION
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Henson, Larry W | Austin, TX | 8 | 534 |
Johnson, Donavon W | Georgetown, TX | 10 | 1870 |
Morgan, Stephen P | Mahopac, NY | 14 | 1248 |
Smith, Todd A | Austin, TX | 31 | 2867 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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