如何使用线程模块暂停和恢复线程?

问题描述

我计划在线程中运行一个很长的进程,因为否则它将冻结我的wxpython应用程序中的UI。

我正在使用:

threading.Thread(target=myLongProcess).start()

来启动线程,它可以工作,但我不知道如何暂停和恢复线程。我在Python文档中查找了上面的方法,但没有找到。

有人能建议我怎么做吗?


解决方案

我也做了一些速度测试,在速度较慢的双处理器linux机器上,设置标志和采取操作的时间快得令人愉快,为0.00002秒。

使用set()clear()事件的线程暂停测试示例:

import threading
import time

# This function gets called by our thread.. so it basically becomes the thread init...                
def wait_for_event(e):
    while True:
        print('	THREAD: This is the thread speaking, we are Waiting for event to start..')
        event_is_set = e.wait()
        print('	THREAD:  WHOOOOOO HOOOO WE GOT A SIGNAL  : %s' % event_is_set)
        # or for Python >= 3.6
        # print(f'	THREAD:  WHOOOOOO HOOOO WE GOT A SIGNAL  : {event_is_set}')
        e.clear()

# Main code
e = threading.Event()
t = threading.Thread(name='pausable_thread', 
                     target=wait_for_event,
                     args=(e,))
t.start()

while True:
    print('MAIN LOOP: still in the main loop..')
    time.sleep(4)
    print('MAIN LOOP: I just set the flag..')
    e.set()
    print('MAIN LOOP: now Im gonna do some processing')
    time.sleep(4)
    print('MAIN LOOP:  .. some more processing im doing   yeahhhh')
    time.sleep(4)
    print('MAIN LOOP: ok ready, soon we will repeat the loop..')
    time.sleep(2)

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