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Code Issues Projects Releases Packages Wiki Activity Actions 8

GH-84559: Deprecate fork being the multiprocessing default. (#100618)

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This starts the process. Users who don't specify their own start method
and use the default on platforms where it is 'fork' will see a
DeprecationWarning upon multiprocessing.Pool() construction or upon
multiprocessing.Process.start() or concurrent.futures.ProcessPool use.

See the related issue and documentation within this change for details.
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Gregory P. Smith 2023-02-02 15:50:35 -08:00 • committed by GitHub
parent 618b7a8260
commit 0ca67e6313
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16 changed files with 284 additions and 63 deletions
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9
Lib/test/test_asyncio/test_events.py
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@ -4,6 +4,7 @@ import collections.abc
import concurrent.futures
import functools
import io
import multiprocessing
import os
import platform
import re
@ -2762,7 +2763,13 @@ class GetEventLoopTestsMixin:
support.skip_if_broken_multiprocessing_synchronize()
async def main():
pool = concurrent.futures.ProcessPoolExecutor()
if multiprocessing.get_start_method() == 'fork':
# Avoid 'fork' DeprecationWarning.
mp_context = multiprocessing.get_context('forkserver')
else:
mp_context = None
pool = concurrent.futures.ProcessPoolExecutor(
mp_context=mp_context)
result = await self.loop.run_in_executor(
pool, _test_get_event_loop_new_process__sub_proc)
pool.shutdown()