Method, apparatus and system for accessing a global...

Details Method, apparatus and system for accessing a global... Method, apparatus and system for accessing a global...

2005-08-02

2005-08-02

Treat, William M. (Department: 2183)

Electrical computers and digital processing systems: processing

Processing control

Branching

C712S216000, C710S200000

Reexamination Certificate

active

06925551

ABSTRACT:
A multiprocessor data processing system includes first and second processors coupled to an interconnect and to a global promotion facility containing at least one promotion bit field. The first processor initiates execution of a branch-type instruction to request acquisition of a promotion bit field exclusive of at least the second processor. In response to the branch-type instruction, the first processor issues an access request to acquire the promotion bit field. After the accessing request, a register of the first processor receives a register bit indicating whether or not the promotion bit field was successfully acquired by the access request. As a part of executing the branch-type instruction, the first processor selects among a first execution path and a second execution path in response to the register bit.

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