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gh-136186: Fix race condition in test_external_inspection.test_only_active_thread by pablogsal · Pull Request #136347 · python/cpython · GitHub

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gh-136186: Fix race condition in test_external_inspection.test_only_active_thread #136347

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Merged
pablogsal merged 1 commit into from
Jul 8, 2025
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gh-136186: Fix race condition in test_external_inspection.test_only_active_thread #136347

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22 changes: 18 additions & 4 deletions Lib/test/test_external_inspection.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
import sys
import socket
import threading
import time
from asyncio import staggered, taskgroups, base_events, tasks
from unittest.mock import ANY
from test.support import os_helper, SHORT_TIMEOUT, busy_retry, requires_gil_enabled
Expand Down Expand Up @@ -930,9 +931,6 @@ def main_work():
# Signal threads to start waiting
ready_event.set()

# Give threads time to start sleeping
time.sleep(0.1)

# Now do busy work to hold the GIL
main_work()
"""
Expand Down Expand Up @@ -967,7 +965,23 @@ def main_work():

# Get stack trace with all threads
unwinder_all = RemoteUnwinder(p.pid, all_threads=True)
all_traces = unwinder_all.get_stack_trace()
for _ in range(10):
# Wait for the main thread to start its busy work
all_traces = unwinder_all.get_stack_trace()
found = False
for thread_id, stack in all_traces:
if not stack:
continue
current_frame = stack[0]
if current_frame.funcname == "main_work" and current_frame.lineno >15:
found = True

if found:
break
# Give a bit of time to take the next sample
time.sleep(0.1)
else:
self.fail("Main thread did not start its busy work on time")

# Get stack trace with only GIL holder
unwinder_gil = RemoteUnwinder(p.pid, only_active_thread=True)
Expand Down
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