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https://issues.apache.org/jira/browse/ARROW-2359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16417917#comment-16417917
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Phillip Cloud commented on ARROW-2359:
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Also, http://en.cppreference.com/w/cpp/memory/shared_ptr states the following:
{code}
All member functions (including copy constructor and copy assignment) can be
called by multiple threads on different instances of shared_ptr without
additional synchronization even if these instances are copies and share
ownership of the same object.
{code}
These functions return a copy of a {{shared_ptr}}.
> Type objects produced by DataType factory are not thread safe
> -------------------------------------------------------------
>
> Key: ARROW-2359
> URL: https://issues.apache.org/jira/browse/ARROW-2359
> Project: Apache Arrow
> Issue Type: Task
> Components: C++
> Reporter: Anton Shmigirilov
> Priority: Minor
> Labels: pull-request-available
>
> TYPE_FACTORY() macro that produces type shortcuts (boolean(), int32(), utf8()
> and so on) uses static shared_ptr inside. There are race conditions possible
> against shared_ptr's reference counter.
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