Lock mechanism to enable atomic updates to shared memory

Details Lock mechanism to enable atomic updates to shared memory Lock mechanism to enable atomic updates to shared memory

2008-03-24

2011-11-08

Bragdon, Reginald (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Shared memory area

C711S147000, C711SE12091

Reexamination Certificate

active

08055856

ABSTRACT:
A system and method for locking and unlocking access to a shared memory for atomic operations provides immediate feedback indicating whether or not the lock was successful. Read data is returned to the requestor with the lock status. The lock status may be changed concurrently when locking during a read or unlocking during a write. Therefore, it is not necessary to check the lock status as a separate transaction prior to or during a read-modify-write operation. Additionally, a lock or unlock may be explicitly specified for each atomic memory operation. Therefore, lock operations are not performed for operations that do not modify the contents of a memory location.

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