Method and device for arbitration of access conflicts between an

Details Method and device for arbitration of access conflicts between an Method and device for arbitration of access conflicts between an

1981-01-22

1983-11-29

Thomas, James D.

Boots, shoes, and leggings

G06F 1300

Patent

active

044183852

ABSTRACT:
Attempts in a data processing system to requisition a process able to have critical section operating phases by means of asynchronous trap(s) are arbitrated. Each time the process enters a critical operating phase, an indicator denoting occupation of a corresponding critical classification is set at one. Each time the process emerges from a critical operating phase the indicator for occupation of the corresponding critical classification is reset to zero. At each asynchronous trap, a trap presence indicator corresponding to the capability of the trap is set to one. Upon arrival of an asynchronous trap, the trap presence indicator corresponding to the capability of the asynchronous trap is set to one. Every time an asynchronous trap is complied with, the asynchronous trap presence indicator corresponding to the fulfilled asynchronous trap is reset to zero. Within an arbitration network, the levels of the critical classifications corresponding to the armed critical classification occupation indicators are confronted with the capabilities of the asynchronous trap presence indicators. The arbitration network authorizes discharge of the asynchronous traps of which the allocated capability overcomes the armed critical classification.

REFERENCES:
patent: 3825902 (1974-07-01), Brown et al.
patent: 4001783 (1977-01-01), Monahan et al.
patent: 4034349 (1977-07-01), Monaco et al.
patent: 4047161 (1977-09-01), Davis

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