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bpo-37224: Wait for subinterpreter to be running #26717

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bpo-37224: Wait for subinterpreter to be running #26717

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7 changes: 7 additions & 0 deletions Lib/test/test__xxsubinterpreters.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,13 +44,20 @@ def _running(interp):
r, w = os.pipe()
def run():
interpreters.run_string(interp, dedent(f"""
# notify interpreter started
with open({w}, 'w', encoding="utf-8") as spipe:
spipe.write('started')

# wait for "signal"
with open({r}, encoding="utf-8") as rpipe:
rpipe.read()
"""))

t = threading.Thread(target=run)
t.start()
with open(r, encoding="utf-8") as rpipe:
# wait for signal from interpreter
rpipe.read()

yield

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