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POCherryPy interferes with Twisted shutting down on Windows
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copied!<p>I've got an application that runs Twisted by starting the reactor with <code>reactor.run()</code> in my main thread after starting some other threads, including the CherryPy web server. Here's a program that shuts down cleanly when Ctrl+C is pressed on Linux but not on Windows:</p> <pre><code>from threading import Thread from signal import signal, SIGINT import cherrypy from twisted.internet import reactor from twisted.web.client import getPage def stop(signum, frame): cherrypy.engine.exit() reactor.callFromThread(reactor.stop) signal(SIGINT, stop) class Root: @cherrypy.expose def index(self): reactor.callFromThread(kickoff) return "Hello World!" cherrypy.server.socket_host = "0.0.0.0" Thread(target=cherrypy.quickstart, args=[Root()]).start() def print_page(html): print(html) def kickoff(): getPage("http://acpstats/account/login").addCallback(print_page) reactor.run() </code></pre> <p>I believe that CherryPy is the culprit here, because here's a different program that I wrote without CherryPy that does shutdown cleanly on both Linux and Windows when Ctrl+C is pressed:</p> <pre><code>from time import sleep from threading import Thread from signal import signal, SIGINT from twisted.internet import reactor from twisted.web.client import getPage keep_going = True def stop(signum, frame): global keep_going keep_going = False reactor.callFromThread(reactor.stop) signal(SIGINT, stop) def print_page(html): print(html) def kickoff(): getPage("http://acpstats/account/login").addCallback(print_page) def periodic_downloader(): while keep_going: reactor.callFromThread(kickoff) sleep(5) Thread(target=periodic_downloader).start() reactor.run() </code></pre> <p>Does anyone have any idea what the problem is? Here's my conundrum:</p> <ul> <li>On Linux everything works</li> <li>On Windows, I can call functions from signal handlers using <code>reactor.callFromThread</code> when CherryPy is not running</li> <li>When CherryPy is running, no function that I call using <code>reactor.callFromThread</code> from a signal handler will ever execute (I've verified that the signal handler itself does get called)</li> </ul> <p>What can I do about this? How can I shut down Twisted on Windows from a signal handler while running CherryPy? Is this a bug, or have I simply missed some important part of the documentation for either of these two projects?</p>

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