Method and apparatus for exploiting communications bandwidth as for providing shared memory
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United States of America Patent
Stats
-
Mar 2, 1993
Grant Date -
N/A
app pub date -
Nov 13, 1989
filing date -
Nov 10, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multiprocessor system linked by a fiber optic ring network uses some of the bandwith of the ring network as a shared memory resource. Data slots are defined on the network which can carry message packets from one processor to another or network memory packets which circulate indefinitely on the network. One use of these network memory packets is as a lock management system for controlling concurrent access to a shared database by the multiple processors. The network memory packets are treated as lock entities. A processor indicates that it wants to procure a lock entity by circulating a packet, having a first network memory type, around the network. If no conflicting packets are detected when the circula ted packet returns, the type of the slot is changed to a second network memory type indicating a procured lock entity.
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