#!/usr/bin/python
#coding=utf8
"""
# Author: songtianlun
# Created Time : 2021-09-26 10:57:39

# File Name: Singleton_with_new.py
# Description:

"""

import threading
class Singleton(object):
    _instance_lock = threading.Lock()

    def __init__(self):
        pass

    def __new__(cls, *args, **kwargs):
        if not hasattr(Singleton, "_instance"):
            with Singleton._instance_lock:
                if not hasattr(Singleton, "_instance"):
                    Singleton._instance = object.__new__(cls)
        return Singleton._instance

class SingletonUse1(Singleton):
    def __init__(self):
        pass

class SingletonUse2(Singleton):
    def __init__(self):
        pass

obj1 = Singleton()
obj2 = Singleton()
print (obj1, obj2)

def task_singleton(arg):
    obj = Singleton()
    print("singleton", obj)

def task_singleton_use1(arg):
    obj = SingletonUse1()
    print("singleton_use_1", obj)

def task_singleton_use2(arg):
    obj = SingletonUse2()
    print("singleton_use_2", obj)

for i in range(10):
    t = threading.Thread(target=task_singleton,args=[i,])
    t.start()

for i in range(10):
    t = threading.Thread(target=task_singleton_use1,args=[i,])
    t.start()

for i in range(10):
    t = threading.Thread(target=task_singleton_use2,args=[i,])
    t.start()