Electrical computers and digital processing systems: memory – Storage accessing and control – Memory configuring
Reexamination Certificate
2006-09-12
2006-09-12
An, Meng-Al T. (Department: 2195)
Electrical computers and digital processing systems: memory
Storage accessing and control
Memory configuring
C711S100000, C711S148000, C711S171000, C711S173000, C707S793000, C717S148000
Reexamination Certificate
active
07107426
ABSTRACT:
A computer system provides an object-based virtual machine environment for running successive applications. The computer system includes storage, at least a portion of which is logically divided into two or more heaps in which objects can be stored. A first heap is reset between successive applications, and a second heap persists from one application to the next. A card table is provided which comprises multiple cards, each corresponding to a region of said storage. Each card in the card table is set to null when the first heap is reset between successive applications. A card is marked whenever an object in its corresponding storage region is created or updated. It is then possible to detect potential references from the second heap to the first heap at reset by scanning the cards in the card table corresponding to the second heap, and detecting any cards which have been marked.The system further identifies any objects on the first heap which have a finalization method. The finalization methods of any such identified objects are then run on the main thread prior to reset of the first heap.
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Borman Samuel David
Kolodner Elliot Karl
Lewis Ethan
Paice Susan Patricia
Trotter Martin John
An Meng-Al T.
August Casey P.
Buchenhorner Michael J.
Holland & Knight LLP
International Business Machines - Corporation
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