python Lock、RLock
2020-12-13 05:29
标签：注意 多次 release color lease glob star desc add Lock: 只能acquire一次，下一次acquire必须release后才能，不然会造成死锁 RLock python Lock、RLock 标签：注意 多次 release color lease glob star desc add 原文地址：https://www.cnblogs.com/callyblog/p/11142218.htmlfrom threading import Lock
total = 0
lock = Lock()
def add():
#1. dosomething1
#2. io操作
# 1. dosomething3
global lock
global total
for i in range(1000000):
lock.acquire()
total += 1
lock.release()
def desc():
global total
global lock
for i in range(1000000):
lock.acquire()
total -= 1
lock.release()
import threading
thread1 = threading.Thread(target=add)
thread2 = threading.Thread(target=desc)
thread1.start()
thread2.start()
#
thread1.join()
thread2.join()
print(total)
from threading import RLock
#RLock在同一个线程里面，可以连续调用多次acquire， 一定要注意acquire的次数要和release的次数相等
total = 0
lock = RLock()
def add():
#1. dosomething1
#2. io操作
# 1. dosomething3
global lock
global total
for i in range(1000000):
lock.acquire()
lock.acquire()
total += 1
lock.release()
lock.release()
def desc():
global total
global lock
for i in range(1000000):
lock.acquire()
total -= 1
lock.release()
import threading
thread1 = threading.Thread(target=add)
thread2 = threading.Thread(target=desc)
thread1.start()
thread2.start()
#
thread1.join()
thread2.join()
print(total)