gh-145587: fix busy loop in multiprocessing.connection.wait on Windows#145597

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Shrey-N wants to merge 3 commits intopython:mainfrom

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gh-145587: fix busy loop in multiprocessing.connection.wait on Windows#145597
Shrey-N wants to merge 3 commits intopython:mainfrom
Shrey-N:145587

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Shrey-N commentedMar 6, 2026•
edited by bedevere-appbot
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On Windows,multiprocessing.connection.wait returns immediately if theobject_list is empty, regardless of the timeout.

This fix adds a check to make sure the function actually sleeps for the duration of the timeout, matching the Unix behavior and stopping the 100% CPU usage spike.

Verified locally:-

importtimefrommultiprocessing.connectionimportwaitstart=time.time()wait([],1.0)# took 0s before, now takes 1print(time.time()-start)

Fixes#145587

Issue:multiprocessing.connection.wait high CPU load with empty object_list #145587

pythongh-145587: fix busy loop in multiprocessing.connection.wait on …

4ff9834

…WindowsEnsure wait() blocks for the specified timeout when object_list is empty, preventing 100% CPU usage. This aligns the Windows behavior with the Unix implementation.