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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Race between asyncio Condition.notify() and Task.cancel() may result in lost wakeups.","articleBody":"# Bug report\n\n### Bug description:\n\nA Task which issues a `condition.notify(1)` to wake up a `Task` from a set of waiting tasks to perform some task, e.g. consume a piece of data, may hit a *race condition* with a simultaneous `cancel()` of a task among the waiting tasks, resulting in none of the tasks\nsuccessfully returning from `cond.wait()`.  This is problematic because because the `notify()` is essentially lost, and starvation/deadlocks may occur.\n\nPR #112201 contains a fix, as well as documentation updates\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nWindows\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-112201\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/kristjanvalur","@type":"Person","name":"kristjanvalur"},"datePublished":"2023-11-17T13:52:57.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/112202/cpython/issues/112202"}