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Fall back to Python-level Thread for GUI warning #24178

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Merged
merged 1 commit into from
Oct 15, 2022
Merged

Fall back to Python-level Thread for GUI warning #24178

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20 changes: 15 additions & 5 deletions lib/matplotlib/pyplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -332,11 +332,21 @@ def draw_if_interactive():


def _warn_if_gui_out_of_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):
warn = False
if _get_required_interactive_framework(_get_backend_mod()):
if hasattr(threading, 'get_native_id'):
# 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 threading.get_native_id() != threading.main_thread().native_id:
warn = True
else:
# Fall back to Python-level Thread if native IDs are unavailable,
# mainly for PyPy.
if threading.current_thread() is not threading.main_thread():
warn = True
if warn:
_api.warn_external(
"Starting a Matplotlib GUI outside of the main thread will likely "
"fail.")
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