Copy and transfer for simultaneous copy garbage collection

摘要

PROBLEM TO BE SOLVED: To provide a method for optimizing a copy of a data object at the time of simultaneous copy garbage collection operation. In one embodiment, a source copy of a data object that will be copied as part of a garbage collection operation is identified. Copying the source copy to the target location is initiated by the primary access thread. Initiating this copy involves creating a temporary target object header containing indicators set to indicate that the copy is in progress for the target object at the target location. When a copy is occurring, the execution of any other access thread that is trying to use the data object is suspended while the indicator indicates that the copy is in progress. When the copy is complete, the target object header is replaced with a copy of the source object header, resetting the metric. [Selection diagram] Fig. 2