Python 多线程共享变量的实现示例

#coding=utf-8
from threading import Thread
import time

g_num = 100

def work1():
 global g_num
 for i in range(3):
  g_num += 1

 print("----in work1, g_num is %d---"%g_num)


def work2():
 global g_num
 print("----in work2, g_num is %d---"%g_num)


print("---线程创建之前g_num is %d---"%g_num)

t1 = Thread(target=work1)
t1.start()

#延时一会，保证t1线程中的事情做完
time.sleep(1)

t2 = Thread(target=work2)
t2.start()

#coding=utf-8
from threading import Thread
import time

def work1(nums):
 nums.append(44)
 print("----in work1---",nums)

def work2(nums):
 #延时一会，保证t1线程中的事情做完
 time.sleep(1)
 print("----in work2---",nums)

g_nums = [11,22,33]

t1 = Thread(target=work1, args=(g_nums,))
t1.start()

t2 = Thread(target=work2, args=(g_nums,))
t2.start()

[root@server01 many_task]# vim test4.py 

#coding=utf-8
import threading
from time import sleep,ctime

# 初始化g_num
g_num = 0

def add_func1(num):
 global g_num
 for i in range(num):
  g_num += 1
  print("add_func1，第%d次，g_num等于%d" % (i,g_num))
  #sleep(0.5)

def add_func2(num):
 global g_num
 for i in range(num):
  g_num += 1
  print("add_func2，第%d次，g_num等于%d" % (i,g_num))
  #sleep(0.5)

def main():
 # 执行线程
 t1 = threading.Thread(target=add_func1,args=(100,))
 t2 = threading.Thread(target=add_func2,args=(100,))

 t1.start()
 t2.start()

 # 判断当线程存在，则等待1秒
 while len(threading.enumerate()) > 1:
  sleep(1)

 print("2个线程对同一个全局变量操作之后的最终结果是:%s" % g_num)

if __name__ == '__main__':
 main()

[root@server01 many_task]# vim test7.py 

def work1(num):
 global g_num
 for i in range(num):
  g_num += 1
 print("----in work1, g_num is %d---"%g_num)


def work2(num):
 global g_num
 for i in range(num):
  g_num += 1
 print("----in work2, g_num is %d---"%g_num)


print("---线程创建之前g_num is %d---"%g_num)

t1 = threading.Thread(target=work1, args=(10000000,))
t1.start()

t2 = threading.Thread(target=work2, args=(10000000,))
t2.start()

while len(threading.enumerate()) != 1:
 time.sleep(1)

print("2个线程对同一个全局变量操作之后的最终结果是:%s" % g_num)