Patents by Inventor Vadakkedathu Thomas Rajan

Vadakkedathu Thomas Rajan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Concurrent collection of cyclic garbage in reference counting systems
    Patent number: 7216136
    Abstract: The present invention provides techniques that allow concurrent collection of cyclic garbage on reference counting systems. In general, candidate objects are found that may be part of cyclic garbage. Each candidate object has a reference count. Two tests are performed to determine if concurrent operations have affected the reference counts of the candidate objects. If concurrent operations have not affected the reference counts, the candidate objects are collected as garbage. Additionally, during garbage collection, the decrements to reference counts are delayed so that increments occur before decrements and so that decrements are held a predetermined time before being applied. This prevents decrementing a reference count and collecting a cycle as garbage right before a reference is added to an object in the cycle.
    Type: Grant
    Filed: December 10, 2001
    Date of Patent: May 8, 2007
    Assignee: International Business Machines Corporation
    Inventors: David Francis Bacon, Vadakkedathu Thomas Rajan
  • Concurrent collection of cyclic garbage in reference counting systems
    Publication number: 20020087590
    Abstract: The present invention provides techniques that allow concurrent collection of cyclic garbage on reference counting systems. In general, candidate objects are found that may be part of cyclic garbage. Each candidate object has a reference count. Two tests are performed to determine if concurrent operations have affected the reference counts of the candidate objects. If concurrent operations have not affected the reference counts, the candidate objects are collected as garbage. Additionally, during garbage collection, the decrements to reference counts are delayed so that increments occur before decrements and so that decrements are held a predetermined time before being applied. This prevents decrementing a reference count and collecting a cycle as garbage right before a reference is added to an object in the cycle.
    Type: Application
    Filed: December 10, 2001
    Publication date: July 4, 2002
    Applicant: International Business Machines Corporation
    Inventors: David Francis Bacon, Vadakkedathu Thomas Rajan