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Compare thread native ids when checking whether running on main thread. #23445

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Merged
merged 1 commit into from
Jul 20, 2022
Merged

Compare thread native ids when checking whether running on main thread. #23445

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7 changes: 5 additions & 2 deletions lib/matplotlib/pyplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -329,8 +329,11 @@ def draw_if_interactive():


def _warn_if_gui_out_of_main_thread():
if (_get_required_interactive_framework(_get_backend_mod())
and threading.current_thread() is not threading.main_thread()):
# This compares native thread ids because even if python-level Thread
# objects match, the underlying OS thread (which is what really matters)
# may be different on Python implementations with green threads.
if (_get_required_interactive_framework(_get_backend_mod()) and
threading.get_native_id() != threading.main_thread().native_id):
_api.warn_external(
"Starting a Matplotlib GUI outside of the main thread will likely "
"fail.")
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