Question

这里简单的新手。我刚开始用简单的方式进行扬声器 - 主持人模拟。这是我的代码

import simpy

def speaker(env):
    try:
        print("Speaker start to talk at: {}".format(env.now))
        speak_time = 40
        print ("Speaker want to speak for {}".format(speak_time))
        yield env.timeout(speak_time)
        print ("Speaker finish the talk at: {}".format(env.now))
   except simpy.Interrupt as interrupt:
        print (interrupt.cause)

def moderator(env):
    for i in range(3):
        print("Moderator let the speaker number {} to begin the speak".format(i))
        speaker_proc = env.process(speaker(env))

        print("Time now: {}".format(env.now))
        time_limit = env.timeout(30)
        results = yield speaker_proc | time_limit
        print("Moderator check whether speaker passed the time limit or no")
        print("Time limit passed: {}".format (speaker_proc not in results))


        if speaker_proc not in results:
            print("Time now: {}".format(env.now))
            speaker_proc.interrupt()
            print ("Moderator stop the talk at: {}".format(env.now))
        print()
        print()

env = simpy.Environment()
env.process(moderator(env))
env.run()

当我使用speak_time＆gt;运行它时30或speak_time＆lt; 30，没有问题，但是如果我改变功能扬声器中的speak_time变为30，它将会出现如下错误：

RuntimeError: <Process(speaker) object at 0x9e17930> has terminated and cannot be interrupted.

发生了什么事？

Answer 1

你在这里遇到一个奇怪的角落案件。虽然你观察到的行为是完全的对于SimBy新手来说，这并不容易理解。

我在print()进程中添加了两个moderator()来显示正在发生的事情：

import simpy


def speaker(env):
    try:
        print("Speaker start to talk at: {}".format(env.now))
        speak_time = 30
        print("Speaker want to speak for {}".format(speak_time))
        yield env.timeout(speak_time)
        print("Speaker finish the talk at: {}".format(env.now))
    except simpy.Interrupt as interrupt:
        print(interrupt.cause)


def moderator(env):
    for i in range(3):
        print("Moderator let the speaker number {} to begin the speak".format(i))
        speaker_proc = env.process(speaker(env))

        print("Time now: {}".format(env.now))
        time_limit = env.timeout(30)
        print('Timeout created')
        results = yield speaker_proc | time_limit
        print("Moderator check whether speaker passed the time limit or no")
        print("Time limit passed: {}".format(speaker_proc not in results))

        if speaker_proc not in results:
            print("Time now: {}".format(env.now))
            print(speaker_proc.is_alive)
            speaker_proc.interrupt()
            print("Moderator stop the talk at: {}".format(env.now))
        print()
        print()

env = simpy.Environment()
env.process(moderator(env))
env.run()

输出：

Moderator let the speaker number 0 to begin the speak
Time now: 0
Timeout created
Speaker start to talk at: 0
Speaker want to speak for 30
Speaker finish the talk at: 30
Moderator check whether speaker passed the time limit or no
Time limit passed: True
Time now: 30
False
Traceback (most recent call last):

那发生了什么？

主持人在第一次yield之前一直有效。那段时间，它创建演讲者流程和超时。
立即触发超时并将其添加到事件队列中。
主持人产生条件事件。
扬声器运行并创建超时。它也会立即触发和预定（与主持人的超时同时，但它是在事件队列中插入后。）
处理主持人的超时时会触发Condition事件。
当主持人恢复时，条件事件仅保留结果主持人的超时，但扬声器进程也终止了。您可以通过speaker_proc.is_alive属性检查。

This guide包含一些有关此内容的更深入信息主题。

简单的中断条件事件

1 个答案: