Storage locking control for a plurality of processors which share a common storage unit
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United States of America Patent
Stats
-
Jan 8, 1991
Grant Date -
N/A
app pub date -
Apr 27, 1988
filing date -
Apr 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a plural processor data processing system, a lock is obtained on a commonly shared storage means that allows for the testing of a control word associated with a selected memory address of a particular data processor wherein each of the data processors of the system is capable of independently requesting a lock on said control word. Lock requests are broadcast to each of the data processors. The lock is then established according to predefined criteria by transmission of the lock requests of all of said processor means at the same time at controlled intervals, and by providing the lock on the control word when the requesting processor is the only processor that is requesting a given control word during a control interval, or when the processor transmits its lock request simultaneously with other processor means of a lower priority.
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