Single operation per-bit memory access

Details Single operation per-bit memory access Single operation per-bit memory access

2003-11-07

2008-07-22

Dollinger, Tonia L. M. (Department: 2181)

Electrical computers and digital processing systems: processing

Processing control

Logic operation instruction processing

C712S245000

Reexamination Certificate

active

07404068

ABSTRACT:
Mechanisms for performing per-bit operations in system memory in a single operation thereby obviating the need for semaphore mechanisms when performing per-bit operations. A processor accesses an instruction that identifies the specific bit of system memory that is to be operated upon, as well as an operation to be performed on the bit. The operation may be, for example, a bit set, clear, or toggle. The processor then instructs system memory to perform the operation. Since the operation is performed in a single operation, other processes do not need to wait before continuing operation on the memory address of the specific bit. In addition, semaphores restricting access to the memory address need not be used while still retaining adequate assurance that the memory address will remain consistent.

REFERENCES:
patent: 5321823 (1994-06-01), Grundmann et al.
patent: 5696969 (1997-12-01), Egolf

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