Handling falsely doomed parents of nested transactions
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United States of America Patent
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Mar 1, 2011
Grant Date -
Jan 1, 2009
app pub date -
Jun 27, 2007
filing date -
Jun 27, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Various technologies and techniques are disclosed for detecting falsely doomed parent transactions of nested children in transactional memory systems. When rolling back nested transactions, a release count is tracked each time that a write lock is released due to rollback for a given nested transaction. For example, a write abort compensation map can be used to track the release count for each nested transaction. The number of times the nested transactions releases a write lock is recorded in their respective write abort compensation map. The release counts can be used during a validation of a parent transaction to determine if a failed optimistic read is really valid. If an aggregated release count for the nested children transactions accounts for the difference in version numbers exactly, then the optimistic read is valid.
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