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Clarify how to work with threads. #14557

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5 changes: 3 additions & 2 deletions doc/faq/howto_faq.rst
Original file line number Diff line number Diff line change
Expand Up @@ -544,8 +544,9 @@ that affect certain artists. Hence, if you work with threads, it is your
responsibility to set up the proper locks to serialize access to Matplotlib
artists.

Note that (for the case where you are working with an interactive backend) most
GUI backends *require* being run from the main thread as well.
You may be able to work on separate figures from separate threads. However,
you must in that case use a *non-interactive backend* (typically Agg), because
most GUI backends *require* being run from the main thread as well.

.. _howto-contribute:

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