python多线程高级锁condition

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多线程编程中如果使用Condition对象代替lock, 能够实现在某个事件触发后才处理数据, condition中含有的方法:
- wait:线程挂起，收到notify通知后继续运行
- notify:通知其他线程, 解除其它线程的wai状态
- notifyAll(): 通知所有线程
- acquire和release: 获得锁和解除锁, 与lock类似,
- enter和exit使得对象支持上下文操作:

def __enter__(self):
return self._lock.__enter__()

def __exit__(self, *args):
return self._lock.__exit__(*args)

代码:

import threading
from threading import Condition
# condition

class XiaoAi(threading.Thread):
def __init__(self, cond):
self.cond = cond
super().__init__(name="xiaoai")

def run(self):
self.cond.acquire()
self.cond.wait()
print('{}:ennn. '.format(self.name))
self.cond.notify()
self.cond.wait()

print('{}:好嗒. '.format(self.name))
self.cond.release()

class TianMao(threading.Thread):
def __init__(self, cond):
super().__init__(name="tiaomao")
self.cond = cond

def run(self):
self.cond.acquire()
print('{}:hello ~ xiaoai. '.format(self.name))
self.cond.notify()
self.cond.wait()

print('{}:我们来念一首诗吧! . '.format(self.name))
self.cond.notify()
self.cond.release()

if __name__ == '__main__':
condition = Condition()
xiaoai = XiaoAi(condition)
tianmao = TianMao(condition)
# 启动顺序很重要
xiaoai.start()
tianmao.start()

打印结果:

tiaomao:hello ~ xiaoai.
xiaoai:ennn.
tiaomao:我们来念一首诗吧! .
xiaoai:好嗒

总结:

这个比较鸡肋

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