gevent隊列如何阻塞和empy隊列，直到項目在隊列中？

Question

Gevent無法正常工作。我想下面會永遠阻止，但我得到下面的錯誤。

from gevent import monkey; monkey.patch_all() 
import gevent 
import gevent.queue  
queue = gevent.queue.Queue() 
queue.get(block=True, timeout=None) 



File "/home/ubuntu/workspace/zenserver/upload_pusher.py", line 53, in proccess_file 
    filepath = queue.get(block=True, timeout=None) 
    File "/usr/local/lib/python2.7/dist-packages/gevent-1.0b2-py2.7-linux-x86_64.egg/gevent/queue.py", line 189, in get 
    result = waiter.get() 
    File "/usr/local/lib/python2.7/dist-packages/gevent-1.0b2-py2.7-linux-x86_64.egg/gevent/hub.py", line 616, in get 
    return self.hub.switch() 
    File "/usr/local/lib/python2.7/dist-packages/gevent-1.0b2-py2.7-linux-x86_64.egg/gevent/hub.py", line 373, in switch 
    return greenlet.switch(self) 
gevent.hub.LoopExit: This operation would block forever 

Answer 1

由於沒有其他greenlet切換到，您會得到該異常。你已經問過唯一的greenlet（主greenlet）是否被阻擋，但是它不可能喚醒（因爲沒有其他的greenlet）。基本上這是gevent讓你知道一個僵局。