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gh-133744: Fix multiprocessing interrupt test: add an event #133746

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merged 1 commit into from
May 12, 2025
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gh-133744: Fix multiprocessing interrupt test: add an event #133746

merged 1 commit into from
May 12, 2025

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@vstinner vstinner commented May 9, 2025 •
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Add an event to synchronize the parent process with the child process: wait until the child process starts sleeping.

@vstinner
pythongh-133744: Fix multiprocessing interrupt test: add an event
83ee464 
Add an event to synchronize the parent process with the child
process: wait until the child process starts sleeping.
@vstinner vstinner added tests Tests in the Lib/test dir topic-multiprocessing labels May 9, 2025
@bedevere-app bedevere-app bot mentioned this pull request May 9, 2025
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@vstinner vstinner marked this pull request as ready for review May 9, 2025 12:56
@vstinner vstinner requested a review from gpshead as a code owner May 9, 2025 12:56
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vstinner commented May 9, 2025

cc @gpshead @colesbury @pitrou

Without this change, the SIGINT signal can be sent too early: in multiprocessing setup code.

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vstinner commented May 9, 2025

With this change, I can no longer reproduce the issue:

$ ./python -m test test_multiprocessing_spawn.test_processes -m test_interrupt_no_handler -m test_interrupt -m test_terminate -m test_kill  -W -F -j14
...
0:02:04 load avg: 17.62 [180] test_multiprocessing_spawn.test_processes passed
0:02:04 load avg: 18.13 [181] test_multiprocessing_spawn.test_processes passed
0:02:06 load avg: 18.13 [182] test_multiprocessing_spawn.test_processes passed

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vstinner commented May 9, 2025

Since 2013, there was a workaround for this issue, using a simple sleep(1): commit 26f9268.

        # XXX maybe terminating too soon causes the problems on Gentoo...
        time.sleep(1)

@vstinner vstinner merged commit c2989b7 into python:main May 12, 2025
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@vstinner vstinner deleted the mp_interrupt branch May 12, 2025 09:10
@vstinner vstinner added needs backport to 3.13 bugs and security fixes needs backport to 3.14 bugs and security fixes labels May 12, 2025
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Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖

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Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖

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Sorry, @vstinner, I could not cleanly backport this to 3.13 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker c2989b7070b18c0b7c51521fed8bc11c159ea5b8 3.13

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request May 12, 2025
@vstinner @miss-islington
pythongh-133744: Fix multiprocessing interrupt test: add an event (py…
491ba18 
…thonGH-133746)

Add an event to synchronize the parent process with the child
process: wait until the child process starts sleeping.
(cherry picked from commit c2989b7)

Co-authored-by: Victor Stinner <[email protected]>
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bedevere-app bot commented May 12, 2025

GH-133916 is a backport of this pull request to the 3.14 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.14 bugs and security fixes label May 12, 2025
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bedevere-app bot commented May 12, 2025

GH-133917 is a backport of this pull request to the 3.13 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.13 bugs and security fixes label May 12, 2025
vstinner added a commit to vstinner/cpython that referenced this pull request May 12, 2025
@vstinner
pythongh-133744: Fix multiprocessing interrupt test: add an event (py…
b523a6a 
…thon#133746)

Add an event to synchronize the parent process with the child
process: wait until the child process starts sleeping.

(cherry picked from commit c2989b7)
vstinner added a commit that referenced this pull request May 12, 2025
@miss-islington @vstinner
[3.14] gh-133744: Fix multiprocessing interrupt test: add an event (G…
f5d2d73 
…H-133746) (#133916)

gh-133744: Fix multiprocessing interrupt test: add an event (GH-133746)

Add an event to synchronize the parent process with the child
process: wait until the child process starts sleeping.
(cherry picked from commit c2989b7)

Co-authored-by: Victor Stinner <[email protected]>
vstinner added a commit that referenced this pull request May 12, 2025
@vstinner
[3.13] gh-133744: Fix multiprocessing interrupt test: add an event (#…
5ce47b9 
…133746) (#133917)

gh-133744: Fix multiprocessing interrupt test: add an event (#133746)

Add an event to synchronize the parent process with the child
process: wait until the child process starts sleeping.

(cherry picked from commit c2989b7)
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