python runtime_error ai_generated true

RuntimeError: <asyncio.locks.Semaphore object at 0x...> 绑定到不同的事件循环

RuntimeError: <asyncio.locks.Semaphore object at 0x...> is bound to a different event loop

ID: python/asyncio-semaphore-bound-in-different-loop

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80%修复率
87%置信度
0证据数
2024-12-03首次发现

版本兼容性

版本状态引入弃用备注
3.8+ active — — —
3.9+ active — — —
3.10+ active — — —
3.11+ active — — —
3.12+ active — — —

根因分析

在某个事件循环下创建的 asyncio 同步原语（Semaphore、Lock、Event、Queue）被另一个循环使用，常见于跨 asyncio.run() 调用复用模块级原语。

English

An asyncio synchronization primitive (Semaphore, Lock, Event, Queue) was created under one loop and used under another, common when module-level primitives are reused across asyncio.run() calls.

generic

解决方案

  1. 95% 成功率 
    async def main():
    sem = asyncio.Semaphore(10)  # created inside the loop
    await run_all(sem)

asyncio.run(main())
  2. 90% 成功率 
    loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
loop.run_until_complete(main())  # reuse loop; do not call asyncio.run() repeatedly

无效尝试

常见但无效的做法:

  1. 85% 失败

    Private attribute hack; the semaphore's internal waiters still reference the old loop.

  2. 80% 失败

    The primitive is still bound to its original loop; new loop does not fix it.