V2EX = way to explore
V2EX 是一个关于分享和探索的地方
Sign Up Now
For Existing Member  Sign In
推荐学习书目
Learn Python the Hard Way
Python Sites
PyPI - Python Package Index
http://diveintopython.org/toc/index.html
Pocoo
值得关注的项目
PyPy
Celery
Jinja2
Read the Docs
gevent
pyenv
virtualenv
Stackless Python
Beautiful Soup
结巴中文分词
Green Unicorn
Sentry
Shovel
Pyflakes
pytest
Python 编程
pep8 Checker
Styles
PEP 8
Google Python Style Guide
Code Style from The Hitchhiker's Guide
shenyansycn
V2EX  ›  Python

Python 简单的线程问题

  •  
  •   shenyansycn · Mar 18, 2021 · 2412 views
    This topic created in 1871 days ago, the information mentioned may be changed or developed.

    代码如下:

    import _thread as thread
    
    stdoutmutex = thread.allocate_lock()
    exitmutexes = [thread.allocate_lock() for i in range(10)]
    
    
    def counter(myId, count):
        for i in range(count):
            print('1 %s -> %s' % (myId, stdoutmutex.locked()))
            stdoutmutex.acquire()
            print('2 %s -> %s' % (myId, stdoutmutex.locked()))
            print(stdoutmutex.locked())
            print('[%s] => %s' % (myId, i))
            stdoutmutex.release()
        exitmutexes[myId].acquire()
    
    
    for i in range(10):
        thread.start_new_thread(counter, (i, 10))
    for mutex in exitmutexes:
        while not mutex.locked(): pass
    print('Main thread exiting')
    

    问题: exitmutexes[myId].acquire()获得了锁的状态,while not mutex.locked(): pass 判断没有锁的话就继续执行,但我不知道什么时候释放的锁。 谢谢大家了!

    4 replies    2021-03-18 16:04:49 +08:00
    linw1995
        1
    linw1995  
       Mar 18, 2021
    想感知线程中函数的执行情况,可以用 Thread.join 。或者更细粒度的可以用 threading.Event
    no1xsyzy
        2
    no1xsyzy  
       Mar 18, 2021
    while not mutex.locked(): pass

    这是判断没有锁就卡住,有锁继续执行。
    shenyansycn
        3
    shenyansycn  
    OP
       Mar 18, 2021
    @no1xsyzy 应该是有锁就卡住,没锁才执行 pass 吧
    shenyansycn
        4
    shenyansycn  
    OP
       Mar 18, 2021
    @no1xsyzy 我明白了,谢谢!
    About   ·   Help   ·   Advertise   ·   Blog   ·   API   ·   FAQ   ·   Solana   ·   2467 Online   Highest 6679   ·     Select Language
    创意工作者们的社区
    World is powered by solitude
    VERSION: 3.9.8.5 · 38ms · UTC 09:33 · PVG 17:33 · LAX 02:33 · JFK 05:33
    ♥ Do have faith in what you're doing.