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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`asyncio` thread-safety issues in the free-threaded build","articleBody":"# Bug report\r\n\r\n1. `fi_freelist` isn't thread-safe (move to `pycore_freelist.h` and follow that pattern)\r\n2. `enter_task`, `leave_task`, and `swap_current_task` aren't thread-safe due to shared `state-\u003ecurrent_tasks` and borrowed references. \r\n3. `register_task` and `unregister_task` aren't thread-safe due to shared `state-\u003easyncio_tasks` linked list\r\n4. `_asyncio_all_tasks_impl` isn't thread-safe due the the `asyncio_tasks` linked list.\r\n\r\nFor 2, 3, and 4, we can consider using critical sections to protect the accesses to `state-\u003ecurrent_tasks` and `state-\u003easyncio_tasks`.\r\n\r\nLonger term, moving data to per-loop will probably help with multi-threaded scaling.\r\n\r\n\u003c!-- gh-linked-prs --\u003e\r\n### Linked PRs\r\n* gh-122132\r\n* gh-122138\r\n* gh-122139\r\n* gh-122152\r\n* gh-122186\r\n* gh-122317\r\n* gh-122612\n* gh-122801\n\u003c!-- /gh-linked-prs --\u003e\r\n","author":{"url":"https://github.com/colesbury","@type":"Person","name":"colesbury"},"datePublished":"2024-06-24T21:49:02.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/120974/cpython/issues/120974"}