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