Message 150497 - Python tracker

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Author	rosslagerwall
Recipients	neologix, pitrou, rosslagerwall, vstinner
Date	2012-01-03.06:12:18
SpamBayes Score	4.5297017e-07
Marked as misclassified	No
Message-id	<1325571140.25.0.93506173628.issue12364@psf.upfronthosting.co.za>
In-reply-to

Content
Retrieving the result of a future after the executor has been shut down can cause a hang. It seems like this regression was introduced in a76257a99636. This regression exists only for ProcessPoolExecutor. The problem is that even if there are pending work items, the processes are still signaled to shut down leaving the pending work items permanently unfinished. The patch simply removes the call to shut down the processes when there are pending work items. Attached is a patch.

Retrieving the result of a future after the executor has been shut down can cause a hang.

It seems like this regression was introduced in a76257a99636. This regression exists only for ProcessPoolExecutor.

The problem is that even if there are pending work items, the processes are still signaled to shut down leaving the pending work items permanently unfinished. The patch simply removes the call to shut down the processes when there are pending work items.

Attached is a patch.

History
Date	User	Action	Args
2012-01-03 06:12:20	rosslagerwall	set	recipients: + rosslagerwall, pitrou, vstinner, neologix
2012-01-03 06:12:20	rosslagerwall	set	messageid: <1325571140.25.0.93506173628.issue12364@psf.upfronthosting.co.za>
2012-01-03 06:12:19	rosslagerwall	link	issue12364 messages
2012-01-03 06:12:19	rosslagerwall	create