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   源码介绍

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#!/usr/bin/python
# -*- coding: utf-8 -*-

import threading


def synchronized(func):
    func.__lock__=threading.Lock()

    def synced_func(*args,**kws):
        with func.__lock__ :
            return func(*args,**kws)

    return synced_func


class Singleton(object):
    instance=None

    @synchronized
    def __new__(cls,*args,**kw):
        if cls.instance is None:
            cls.instance = object.__new__(cls, *args, **kw)
        return cls.instance

    def __init__(self, num):
        self.a = num   5

    def printf(self):
        print(self.a)


def worker(i):
    single_test = Singleton(i)
    single_test.printf()
    print "id----> %s" % id(single_test)


if __name__ == "__main__":
    task_list = []
    for i in range(3):
        t = threading.Thread(target=worker,args=(i,))
        task_list.append(t)

    for one in task_list:
        one.start()

    for one in task_list:
        one.join()