娄底网站seo,建平台网站费用,帝国cms 做的博客网站,做网站商城需要多少钱Python互斥锁实例#xff08;包含超时解锁#xff09; 文章目录 前言正文1 锁被占用直接返回2 拿不到锁则一直等待3 拿不到锁等待直到超时 总结 前言
最近遇到一个小需求#xff0c;大概是请求机器人自动化设备执行某些功能#xff0c;这些功能之间有共同操作资源或在…Python互斥锁实例包含超时解锁 文章目录 前言正文1 锁被占用直接返回2 拿不到锁则一直等待3 拿不到锁等待直到超时 总结 前言
最近遇到一个小需求大概是请求机器人自动化设备执行某些功能这些功能之间有共同操作资源或在业务逻辑上有冲突如何保证多线程的请求不会同时执行造成损失。1
这里使用的是互斥锁当有任务正在执行时写了如下几种处理方式
直接返回等待拿到锁继续执行等待拿到锁继续执行或超时返回
正文
代码如下
import threading
import timeprocess_lock threading.Lock()def process1(id_num):name process1- str(id_num)if process_lock.locked():print(name, is locked)returnif process_lock.acquire():time.sleep(0.1)print(name, get lock )process_lock.release()print(name, release lock)def process2(id_num):name process2- str(id_num)if process_lock.locked():print(name, is locked)if process_lock.acquire():time.sleep(0.2)print(name, get lock )process_lock.release()print(name, release lock)def process3(id_num):name process3-str(id_num)if process_lock.locked():print(name, is locked)if process_lock.acquire(blockingTrue, timeout0.3):try:print(name, get lock)time.sleep(0.2)finally:process_lock.release()print(name, release lock)if __name__ __main__:# # 如果锁被占用则直接返回# for i in range(3):# threading.Thread(targetprocess1, args(i,)).start()# # 如果拿不到锁则一直等待# for i in range(3):# time.sleep(0.1)# threading.Thread(targetprocess2, args(i,)).start()# 如果拿不到锁则等待直到超时for i in range(3):threading.Thread(targetprocess3, args(i,)).start()
1 锁被占用直接返回
process1-1 is locked
process1-2 is locked
process1-0 get lock
process1-0 release lock0号线程拿到了锁1 2线程没拿到锁直接返回
2 拿不到锁则一直等待
process2-1 is locked
process2-0 get lock
process2-0 release lock
process2-2 is locked
process2-1 get lock
process2-1 release lock
process2-2 get lock
process2-2 release lock0 1 2三个线程逐次拿到锁执行后释放
3 拿不到锁等待直到超时
process3-0 get lock
process3-1 is locked
process3-2 is locked
process3-0 release lock
process3-1 get lock
process3-1 release lock0 拿到锁执行完释放2拿到锁再释放于此同时3已经超时
总结
虽然这篇文章写的比较基础但是实际使用中大家可能都会用的到整理记录于此。 threading — Thread-based parallelism — Python 3.12.2 documentation ↩︎
