Asymmetric coherency protection

Details Asymmetric coherency protection Asymmetric coherency protection

2002-03-20

2008-09-09

Corrielus, Jean M (Department: 2162)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000, C709S226000

Reexamination Certificate

active

07424496

ABSTRACT:
Prior to updating a database entry, an update task invalidates a valid indicator (e.g., a bit) associated with the database entry. The update task waits for any other tasks (e.g., user tasks) that are accessing the database entry to complete their processing. In particular, a synchronization register holds a synchronization entry (e.g., a bit) for each user task that is created by a micro controller. The update task sets each synchronization entry of the synchronization register to a first value. As each user task completes its processing, the synchronization entry associated with the user task in the synchronization register is set to a second value (e.g., the synchronization bit is reset). The update task monitors the synchronization register, and, when each synchronization entry has been set to the second value, the update task performs its update of the database entry.

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