單線程實現多個定時器

NewTimer.py
代碼如下:
#!/usr/bin/env python

from heapq import *
from threading import Timer
import threading
import uuid
import time
import datetime
import sys
import math

global TimerStamp
global TimerTimes

class CancelFail(Exception):
    pass

class Slot(object):
    def __init__(self, period=0, interval=1, function=None, args=[], kwargs={}):
        self.period = period
        self.pc = 0
        self.interval = interval
        self.fire = 0
        self.id = uuid.uuid1()
        self.function = function
        self.args = args
        self.kwargs = kwargs

#system resolution millisecond        
class NewTimer(object):

    #set enough time make thread sleep, when NewTimer empty set enoug time, too
    #make sure sum of your timer call back function execute time shorter than resolution
    #todo use a worker thread to operate timer call back function
    def __init__(self, resolution=1000):
        global TimerStamp
        TimerStamp = int(time.time() * 1000)

        self.nofire = sys.maxint #next fire time interval
        self.firestamp = self.nofire + TimerStamp
        self.resolution = resolution# 1s

        self.lock = threading.RLock()

        self.wait = dict()
        self.ready = dict()

        self._start()

    """ private operate ready list """
    def _addToReadyList(self, slot, firestamp):
        box = dict( [ (slot.id, slot)])
        if not self.ready.has_key( firestamp ):
            self.ready.update( [(firestamp, box)] )
        else:
            boxs = self.ready.get(firestamp)
            boxs.update( box )

    def _delFromReadyList(self, slot):
        boxs = self.ready.get(slot.fire)
        try:
            box = boxs.pop(slot.id)