Python-4.23 Event事件_event.set-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_49729516/article/details/113869812

本文探讨了如何使用Python的Event对象来协调线程间的交互，通过实例展示了event.wait()和event.set()在控制线程执行和同步中的关键作用。通过conn和check函数，演示了线程间通信和超时机制的应用。

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event.isSet()：返回event的状态值；

event.wait()：如果 event.isSet()==False将阻塞线程；

event.set()：设置event的状态值为True，所有阻塞池的线程激活进入就绪状态，等待操作系统调度；

event.clear()：恢复event的状态值为False。

import time
from threading import Thread, Event

event = Event()
# event.wait()
# event.set()


def student(name):
    print('学生%s 正在听课' % name)
    event.wait(2)
    print('学生%s 课间活动' % name)


def teacher(name):
    print('老师%s 正在授课' % name)
    time.sleep(7)
    event.set()


if __name__ == '__main__':
    stu1 = Thread(target=student, args=('allen',))
    stu2 = Thread(target=student, args=('wxx',))
    stu3 = Thread(target=student, args=('yxx',))
    t1 = Thread(target=teacher, args=('winnie',))

    stu1.start()
    stu2.start()
    stu3.start()
    t1.start()

结果：
学生allen 正在听课
学生wxx 正在听课
学生yxx 正在听课
老师winnie 正在授课
学生wxx 课间活动
学生allen 课间活动
学生yxx 课间活动

import time
from threading import Thread, Event, currentThread

event = Event()


def conn():
    n = 0
    while not event.is_set():
        if n == 3:
            print('%s try too many times' % currentThread().getName())
            return
        print('%s try %s' % (currentThread().getName(), n))
        event.wait(0.5)
        n += 1

    print('%s is connected' % currentThread().getName())


def check():
    print('%s is checking' % currentThread().getName())
    time.sleep(5)
    event.set()


if __name__ == '__main__':
    for i in range(3):
        t = Thread(target=conn)
        t.start()
    t = Thread(target=check)
    t.start()


结果：
Thread-1 try 0
Thread-2 try 0
Thread-3 try 0
Thread-4 is checking
Thread-1 try 1
Thread-3 try 1
Thread-2 try 1
Thread-1 try 2
Thread-2 try 2
Thread-3 try 2
Thread-1 try too many times
Thread-3 try too many times
Thread-2 try too many times