Software assisted nested hardware transactions

Details Software assisted nested hardware transactions Software assisted nested hardware transactions

2005-12-30

2010-06-01

Li, Aimee J (Department: 2183)

Electrical computers and digital processing systems: processing

Processing control

C718S101000, C711S147000, C713S375000

Reexamination Certificate

active

07730286

ABSTRACT:
A method and apparatus for efficiently executing nested transactions is herein described. Hardware support for execution of transactions is provided. Additionally, through the use of logging previous values immediately before a current nested transaction in a local memory and storage of a stack of handlers associated with a hierarchy of transactions, nested transactions are potentially efficiently executed. Upon a failure, abort, or invalidating event/access within a nested transaction, the state of variables or memory locations written to during execution of the nested transaction are rolled-back to immediately before the nested transaction, instead of all the way back to an original state of the variables or memory locations before an enclosing transaction. As a result, nested transactions may be re-executed within enclosing transactions, without flattening the enclosing and nested transactions to re-execute everything.

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