asyncio 的 queue.get()问题 - V2EX
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ryanking8215
V2EX    Python

asyncio 的 queue.get()问题

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  •   ryanking8215
    ryanking8215 2016-01-08 11:25:43 +08:00 3544 次点击
    这是一个创建于 3594 天前的主题,其中的信息可能已经有所发展或是发生改变。

    描述

    python3.4 环境
    - 任务 1 往 queue 每隔 2s 塞一个数据
    - 任务 2 使用一个循环, 1s 超时获取 queue 数据。

    现象: 任务 2 一直得不到数据。, 从原则上说,这把 get()超时了,只要 put()过了,下一把 get 怎么也能得到数据。但就是没有数据,一直超时。

    任务 2 为什么不一直 yield from queue.get()呢?一直 yield from 当然可以得到,问题就是这个 asyncio.wait_for()超时会得不到, timeout=1 得不到, timeout=0.5 是 ok 的, >2 是 ok 的,=2 也是得不到的。

    代码

    import asyncio #from queues import Queue class Test: def __init__(self, loop=None): self._queue = asyncio.Queue(loop=loop) self._future = asyncio.Future(loop=loop) @asyncio.coroutine def run(self): asyncio.async(self._feed_queue(2)) asyncio.async(self._recv()) @asyncio.coroutine def _feed_queue(self, interval): v = 0 while True: yield from asyncio.sleep(interval) print("feed") yield from self._queue.put(v) v = v+1 # print("%s" % repr(self._queue)) @asyncio.coroutine def _recv(self): while True: # print('wait') try: r = yield from asyncio.wait_for(self._queue.get(), timeout1.0) print(">>>>>>>>>>>>>>>",r) except asyncio.TimeoutError: print("timeout") continue except: break print("quit") loop = asyncio.get_event_loop() t = Test(loop=loop) asyncio.async(t.run()) loop.run_forever() 
    第 1 条附言    2016-01-08 12:06:16 +08:00
    python3.5.1 已经修正了
    目前尚无回复
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