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gh-160326: Raise ValueError for a NaN timeout in Condition.wait() - #160327
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A NaN timeout was treated as zero, which made the deadline loops built on Condition.wait(), such as Queue.get() and Semaphore.acquire(), spin without ever timing out.
gpshead
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October 22, 2026 19:19
gpshead
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needs backport to 3.14
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Thanks @gpshead for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15. |
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GH-160416 is a backport of this pull request to the 3.15 branch. |
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GH-160417 is a backport of this pull request to the 3.14 branch. |
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Oct 23, 2026
…t() (GH-160327) (#160417) gh-160326: Raise ValueError for a NaN timeout in Condition.wait() (GH-160327) A NaN timeout was treated as zero, which made the deadline loops built on Condition.wait(), such as Queue.get() and Semaphore.acquire(), spin without ever timing out. (cherry picked from commit 3387b19) Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
gpshead
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Oct 23, 2026
…t() (GH-160327) (#160416) gh-160326: Raise ValueError for a NaN timeout in Condition.wait() (GH-160327) A NaN timeout was treated as zero, which made the deadline loops built on Condition.wait(), such as Queue.get() and Semaphore.acquire(), spin without ever timing out. (cherry picked from commit 3387b19) Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
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Condition.wait()only blocked whentimeout > 0, so a NaN timeout became a non-blocking acquire and every deadline loop on top of it (Queue.get()/put(),Semaphore.acquire(),Condition.wait_for(),Barrier.wait(),as_completed()) spun without ever timing out. Take the non-blocking path only fortimeout <= 0, so that NaN reacheslock.acquire()and gets theValueErrorit already raises.Condition.wait()andEvent.wait()with a NaN timeout used to returnFalseat once and now raise, which is why there is no backport label. The error is only raised when a call has to wait:Queue.get(timeout=nan)on a non-empty queue still succeeds.Fixes #160326
ANT-2026-TIT4IOV6
queue.Queue.get()and otherthreading.Condition.wait()callers busy-loop on a NaN timeout #160326