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From "Douglas Creager (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (AVRO-746) Atomic reference counts
Date Tue, 12 Jul 2011 20:23:00 GMT

     [ 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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