Boots – shoes – and leggings
Patent
1979-11-19
1982-10-12
Shaw, Gareth D.
Boots, shoes, and leggings
G06F 946, G06F 1300
Patent
active
043542271
ABSTRACT:
In multiprocessor data processing systems that utilize individual processors having interlaced cycles of operation controlled by complementarily phased clocks, contention for fixed resources such as memory, I/O, or data storage for example, may result unless an interlock method allocating the use of the fixed resource to one or another of the interlaced cycle processors is included. The usual test and set instruction approach for allocating fixed resources will not effectively interlock the use of fixed resources in a multiprocessor system having interlaced cycles without potential contention arising. The present invention resolves this difficulty by providing means for identifying which processor currently has been allocated control of a given fixed resource. In particular, in order to resolve the possible state of contention between processors accessing a common storage area which indicates the present allocation of the common fixed shared resource, the invention includes a test and set interlock instruction that is described to resolve the problem. Thus, potential contention between processors for access to the allocating means is resolved and the allocating means itself resolves potential contention for the fixed shared resource.
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Hays, Jr. Daniel O.
Maholick Andrew W.
Mize William N.
Chan Eddie P.
Duffield Edward H.
International Business Machines Corp.
Shaw Gareth D.
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