Read lock miss control and queue management

Details Read lock miss control and queue management Read lock miss control and queue management

2001-10-02

2004-01-20

Peikari, B. James (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Shared memory area

C711S151000, C711S145000, C711S156000, C711S104000, C711S163000, C710S052000

Reexamination Certificate

active

06681300

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to read lock memory references.
When a computer instruction (thread) needs access to a memory location in the computer, it goes to a memory controller. A memory reference instruction may request a read lock on a particular memory location. The read lock prevents other instructions from accessing that memory location until a read unlock instruction for that memory location gets granted.
SUMMARY OF THE INVENTION
According to one aspect of the invention, a method is described of managing memory access to random access memory includes fetching a read lock memory reference request and placing the read lock memory reference request at the end of a read lock miss queue if the read lock memory reference request is requesting access to an unlocked memory location and the read lock miss queue contains at least one read lock memory reference request.
Other advantages will become apparent from the following description and from the claims.


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