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Posted to dev@avro.apache.org by "Douglas Creager (JIRA)" <ji...@apache.org> on 2011/07/12 22:23:00 UTC
[jira] [Resolved] (AVRO-746) Atomic reference counts
[ https://issues.apache.org/jira/browse/AVRO-746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Douglas Creager resolved AVRO-746.
----------------------------------
Resolution: Fixed
Fix Version/s: 1.6.0
Committed to SVN for 1.6.0; not back-ported to 1.5 branch
> Atomic reference counts
> -----------------------
>
> Key: AVRO-746
> URL: https://issues.apache.org/jira/browse/AVRO-746
> Project: Avro
> Issue Type: Bug
> Components: c
> Reporter: Douglas Creager
> Assignee: Douglas Creager
> Fix For: 1.6.0
>
> Attachments: 0001-Atomic-reference-counts.patch, 0001-Performance-test-program.patch, 0002-Serialization-performance-test.patch
>
>
> In one of my projects that uses Avro, I pass avro_datum_t instances between threads, using the reference count mechanism to make sure that they're not freed while any thread still has a reference to them. I was getting some spurious segfaults, which were caused by the fact that the reference counts aren't updated atomically. I've created a patch that implements atomic reference counts, using the [OpenPA library|http://trac.mcs.anl.gov/projects/openpa/] to provide the atomic operations themselves. (That library is MIT licensed, so it can be included in the source tree.)
> Note that only avro_XXX_incref and avro_XXX_decref are thread-safe as a result of this patch. For all of the other library functions, the caller is still responsible for ensuring thread safety.
> The patch makes sure that the OpenPA code works in both the old autotools build and the newer CMake build.
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