gistfile1.py

import logging
import os
import signal
import sys

def when_ready(server):
    def monitor():
        modify_times = {}
        while True:
            for module in sys.modules.values():
                path = getattr(module, "__file__", None)
                if not path: continue
                if path.endswith(".pyc") or path.endswith(".pyo"):
                    path = path[:-1]
                try:
                    modified = os.stat(path).st_mtime
                except:
                    continue
                if path not in modify_times:
                    modify_times[path] = modified
                    continue
                if modify_times[path] != modified:
                    logging.info("%s modified; restarting server", path)
                    os.kill(os.getpid(), signal.SIGHUP)
                    modify_times = {}
                    break
            gevent.sleep(1)

    import gevent
    gevent.spawn(monitor)

worker_class = 'gevent'