Object locking in a shared VM environment

Details Object locking in a shared VM environment Object locking in a shared VM environment

2006-04-25

2006-04-25

Truong, Cam-Y (Department: 2162)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000, C707S793000, C707S793000, C707S793000

Reexamination Certificate

active

07035870

ABSTRACT:
A system is provided which comprises multiple Java virtual machines (VMs). Each VM is capable of running a plurality of threads. The system includes at least one object which is shared between the VMs so that it is accessible from two or more VMs, and at least one non-shared object which is accessible only from a single VM. In order to perform a lock operation on a shared object, it is first detecting that an object is a shared object. In a preferred embodiment, this is accomplished by locating a predefined value in a particular lock data word in the object. In response to the detection, a monitor is used to control local access to the shared object for the thread that is requesting the object. The monitor is on the same VM as the requesting thread. In addition, a data structure, which may be a proxy object, is updated in order to associate the monitor with the shared object.

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“Inside the Java Machine” by Bill Venners, McGraw-Hill, ISBN 0-07-913248-0, 2ndEdition, Chapter 20. Available online at http://www.artima.com/insidejvm/ed2/ch20ThreadSynchronizationPrint.html.

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