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
Attachments: 0001-Atomic-reference-counts.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 are
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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