Python:raw_input并在线程中打印 [英] Python : raw_input and print in a thread

问题描述

我有一个可以在控制台上打印一些文本的线程，主程序有一个raw_input来控制该线程.

I have a thread which can print some text on the console and the main program have a raw_input to control the thread.

我的问题是当我在写线程的时候，我也得到了这样的东西:

My problem is when I'm writing and the thread too I get something like this:

-->whatiwWHATTHETHREADWRITErite

但是我想得到这样的东西

but I would like to get some thing like this

WHATTHETHREADWRITE
-->whatiwrite

谢谢！

推荐答案

您必须将输入与线程输出同步，以防止它们同时发生.

You have to syncronize your input with the thread output preventing them from happening at the same time.

您可以像这样修改主循环:

You can modify the main loop like:

lock = threading.lock()

while 1:
    raw_input()     # Waiting for you to press Enter
    with lock:
        r = raw_input('--> ')
        # send your command to the thread

然后锁定后台线程打印:

And then lock the background thread printing:

def worker(lock, ...):
    [...]
    with lock:
        print('what the thread write')

简而言之，当您Press Enter时，将停止线程并进入输入模式".

In short when you Press Enter you will stop the thread and enter in "input mode".

更具体地说，每次您Press Enter您都会:

To be more specific, every time you Press Enter you will:

• 等待锁可用
• 获取锁
• 打印-->并等待您的命令
• 插入命令
• 将该命令发送到线程
• 释放锁

• wait for the lock to be available
• acquire the lock
• print --> and wait for your command
• insert your command
• send that command to the thread
• release the lock

因此，只有当您处于输入模式"时，线程尝试打印时，线程才会停止，
在您的终端中，您将得到类似的信息:

So your thread will be stopped only if it tries to print when you are in "input mode",
and in your terminal you'll get something like:

some previous output

---> your input
THE THREAD OUTPUT

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