问Python3.4 concurrent.futures.Executor不允许控件暂停并继续线程

EN

import concurrent.futures
import urllib.request
import os.path
import datetime
import sys
import pathlib
from errno import ENOENT, EACCES, EPERM
import time
import threading

listOfFilesFromDirectory =  []
webroot = settings.configuration.WEBSERVER_WEBROOT
WEBSERVER_PORT = settings.configuration.WEBSERVER_PORT
shutdown = False

def class myclass:

#populating the list with the urls from a file
def triggerMethod(path):
    try:
        for line in open(path):
            listOfFilesFromDirectory.append(line)
    except IOError as err:
        if err.errno == ENOENT:
            #logging.critical("document.txt file is missing")
            print("document.txt file is missing")
        elif err.errno in (EACCES, EPERM):
            #logging.critical("You are not allowed to read document.txt")
            print("You are not allowed to read document.txt")
        else:
            raise   

# calling this method to stop the threads and restart after a sleep of 100 secs, as the list will always have the urls that were not executed.
def stopExecutor(executor):
    filePath = "C:\logs\serverStopLog.txt"
    while not shutdown:
        time.sleep(5)
        if os.path.isfile(filePath):
            executor.shutdown( )
            time.sleep(100)
            runRegressionInMultipleThreads( )
            break

def load_url(url, timeout):
    conn = urllib.request.urlopen('http://localhost:' + WEBSERVER_PORT + "/" + url, timeout = timeout)
    return conn.info()

def trigegerFunc( ):
    # We can use a with statement to ensure threads are cleaned up promptly
    with concurrent.futures.ThreadPoolExecutor(max_workers=20) as executor:
        # Start the load operations and mark each future with its URL
        future_to_url = {executor.submit(load_url, url, 60): url for url in listOfFilesFromDirectory}

        t = threading.Thread(target=stopExecutor, args=(executor))
        t.start()
        for future in concurrent.futures.as_completed(future_to_url):
            url = future_to_url[future]
            try:
                data = future.result()
            except Exception as exc:
                print('%r generated an exception: %s' % (url, exc))
                listOfFilesFromDirectory.remove(url)
            else:
                if data:
                    if "200" in data:
                        listOfFilesFromDirectory.remove(url)
                    else:
                        listOfFilesFromDirectory.remove(url)
                else:
                    listOfFilesFromDirectory.remove(url)
        shutdown = True
        t.join()                


triggerMethod("C:\inetpub\wwwroot")
trigegerFunc()