Processing changes to reference counts associated with an object in reference counting systems
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United States of America Patent
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Jul 15, 2014
Grant Date -
May 24, 2012
app pub date -
Feb 1, 2012
filing date -
Dec 11, 2000
priority date (Note) -
In Force
status (Latency Note)
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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 and collecting a cycle as garbage right before a reference is added to an object in the cycle.
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