need patch queue.SimpleQueue for py37

[wwqgtxx]

• gevent version: gevent==1.3.4
• Python version: cPython3.7.0 downloaded from python.org
• Operating System: win10 1709

Description:

The python37 default SimpleQueue was implemented with C code, which will cause hang the main thread.
A simple way to solve this problem like that

from gevent import monkey
monkey.patch_all()
import queue
queue.SimpleQueue = queue._PySimpleQueue

but I think this code is so ugly and may be have better way to implements in gevent.

[wwqgtxx]

Another interesting question I want to know is why not patch the whole queue module by gevent.queue ☺

[jamadden]

There are native thread use cases for the original objects.

[wwqgtxx]

In my test, combine use the native thread and the monkey patched standard library sometimes will cause deadlock but I can't confirm when and where cause that. So I rewrite that code by use multiprocessing but gevent will block in some multiprocessing's native code too. Could gevent provide a document to says how to use native thread with gevent correctly and the compatibility with standard library to avoid the users writing the wrong code.