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python多线程高级锁condition简单用法示例

yipeiwu_com6年前 (2020-03-06)Python基础

本文实例讲述了python多线程高级锁condition简单用法。分享给大家供大家参考，具体如下：

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: