bottle gevent和线程：gevent仅可用于单个线程 [英] bottle gevent and threading: gevent is only usable from a single thread

问题描述

我有一个使用线程的python瓶应用程序。由于我使用的是 monkey.patch ，这些线程阻止了应用执行（从线程触发的对话框阻止瓶路线响应客户端，直到被关闭。）

I have a python bottle application, which uses threads. due to the fact I'm using monkey.patch, the threads were blocking app execution (a dialog box fired from a thread was blocking bottle routes from responding to the client, until dismissed.)

此处的一项小研究表明，我应该使用猴子补丁而不要尝试补丁线程：

A little research here showed I should use monkey patch without trying to patch Thread:

# Patch python's threads with greenlets
from gevent import monkey
monkey.patch_all(thread=False)

这不会在最小的示例。我写过。

This does not block on a minimal example I wrote.

但是在与线程大量使用时会出现这些错误，使用像 threading.setEvent（）

这样的方法，这是我得到的错误：

But raises these errors on intensive use with Threads, with methods like threading.setEvent()
This is the error I get:

C:\Users\IEUser\downloadloft-localserver>python mainserver.py
Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Program Files\DownloadLoft\Python27\lib\threading.py", line 551, in _
_bootstrap_inner
self.run()
  File "C:\Program Files\DownloadLoft\Python27\lib\threading.py", line 753, in r
un
self.finished.wait(self.interval)
  File "C:\Program Files\DownloadLoft\Python27\lib\threading.py", line 403, in w
ait
self.__cond.wait(timeout)
  File "C:\Program Files\DownloadLoft\Python27\lib\threading.py", line 262, in w
ait
_sleep(delay)
  File "c:\users\admini~1\appdata\local\temp\easy_install-sch3hm\gevent-0.13.8-p
y2.7-win32.egg.tmp\gevent\hub.py", line 79, in sleep
switch_result = get_hub().switch()
  File "c:\users\admini~1\appdata\local\temp\easy_install-sch3hm\gevent-0.13.8-p
y2.7-win32.egg.tmp\gevent\hub.py", line 135, in get_hub
raise NotImplementedError('gevent is only usable from a single thread')
NotImplementedError: gevent is only usable from a single thread

Bottle v0.12-dev server starting up (using GeventSocketIOServer())...
Listening on http://localhost:8080/
Hit Ctrl-C to quit.

Exception in thread Thread-2:
Traceback (most recent call last):
  File "C:\Program Files\DownloadLoft\Python27\lib\threading.py", line 551, in _
_bootstrap_inner
self.run()
  File "C:\Program Files\DownloadLoft\Python27\lib\threading.py", line 753, in r
un
self.finished.wait(self.interval)
  File "C:\Program Files\DownloadLoft\Python27\lib\threading.py", line 403, in w
ait
self.__cond.wait(timeout)
  File "C:\Program Files\DownloadLoft\Python27\lib\threading.py", line 262, in w
ait
_sleep(delay)
  File "c:\users\admini~1\appdata\local\temp\easy_install-sch3hm\gevent-0.13.8-p
y2.7-win32.egg.tmp\gevent\hub.py", line 79, in sleep
switch_result = get_hub().switch()
  File "c:\users\admini~1\appdata\local\temp\easy_install-sch3hm\gevent-0.13.8-p
y2.7-win32.egg.tmp\gevent\hub.py", line 135, in get_hub
raise NotImplementedError('gevent is only usable from a single thread')
NotImplementedError: gevent is only usable from a single thread

是这是gevent.monkeypatch的已知问题？有任何想法吗？

Is this a known issue with gevent.monkeypatch? Any ideas?

推荐答案

瓶子应用程序是线程化的，所以您不能在瓶子路线中调用的任何函数中使用gevent。

Bottle applications are threaded, so you can't use gevent in any function called in bottle routes.

为帮助您，我需要推测您为什么使用线程。

To help you, I need to speculate why you use threads.

如果是为了加速您的酒瓶网站，请贾斯汀使用cherrypy服务器：

If it's to accelerate your bottle website, juste use the cherrypy server :

pip install cherrypy 

（或者只是将当前目录中的cherrypy目录转储，这是一个纯Python服务器）

(or just dump the cherrypy dir in your current dir, it's a pure Python server)

然后运行您的bottle应用方式：

Then run your bottle app this way :

bottle.run(server='cherrypy')

如果是因为您希望在不阻止响应的情况下进行非阻止性调用（例如，获取URL），则很容易手动进行操作：

If it's because you want to make non blocking calls (such as fetching URLs) without blocking the response, it's easy enought to do it manually :

• 创建一个队列对象（这是一个特殊的队列，可以在线程之间填充并弹出）。


• 创建并运行一个无限while循环的线程取消弹出队列并每次执行操作时间。


• 当您需要无阻塞呼叫时，将操作推入队列并携带一个。

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