python重复执行_python线程重复执行

for i in range(5):

t = threading.Thread(target=sub)

t.start()

print('start %s' % t.name)

for 循环循环了5次之后,t 就是线程5了呀.

def sub():

global num

print('sub %s' % t.name)

lock.acquire() # 获得同步锁：不让别的线程在同一时刻运行

print(t.name)

temp = num

time.sleep(1)

num = temp - 1

lock.release() #解除同步锁

print('%s ' % t.name, num)

这个里面的t 是全局的,for循环五次后,正好是线程5.然后你打印肯定是线程5 呀

下面是正确写法:

import threading, time

num = 5

lock = threading.Lock() # 创建同步锁

# L = []

def sub():

global num

print('sub %s' % t.name)

lock.acquire() # 获得同步锁：不让别的线程在同一时刻运行

print(threading.current_thread().getName())

temp = num

time.sleep(1)

num = temp - 1

lock.release() #解除同步锁

print('%s ' % t.name, num)

for i in range(5):

t = threading.Thread(target=sub)

t.start()

print('start %s' % t.name)

# L.append(t)

# for T in L:

# T.join()

print('s', num)