[New-bugs-announce] [issue29971] Lock.acquire() not interruptible on Windows

[Antoine Pitrou]

New submission from Antoine Pitrou:

On Windows, Lock.acquire() (and other synchronization primitives derived from it, such as queue.Queue) cannot be interrupted with Ctrl-C, which makes it difficult to interrupt a process waiting on such a primitive.

Judging by the code in Python/_thread_nt.h, it should be relatively easy to add such support for the "legacy" semaphore-based implementation (by using WaitForMultipleObjects instead of WaitForSingleObject), but it would be much hairier for the new condition variable-based implementation.

Of course, many other library calls are prone to this limitation (not being interruptible with Ctrl-C on Windows).

See https://github.com/dask/dask/pull/2144#issuecomment-290556996 for original report.

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components: Library (Lib), Windows
messages: 291072
nosy: kristjan.jonsson, paul.moore, pitrou, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Lock.acquire() not interruptible on Windows
type: enhancement
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29971>
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