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It makes sure that one thread can access a particular resource at a time and it also prevents the use of objects and bytecodes at once. Also, ILock support re-entrance.Are you sure about the race issues? I also want the main while loop to keep looping while other threads are in queue.
The mutex module defines a class that allows mutual-exclusion via acquiring and releasing locks. An asyncio lock can be used to guarantee exclusive access to a shared resource.
Free 30 Day Trial Stack Overflow for Teams is a private, secure spot for you and My actual script has reached over 500 lines of code, which include database entries and email. Instead, neither hangs; it appears they aren't acquiring the same mutex.The "traditional" Unix answer is to use file locks. Also, why do you want the main thread to keep looping? I consider the job of creating that file down to my 'installer' (for want of a better word), and my preference is to see any problems with that file creation at install time instead of run-time when it's hard to debug. Using the Python methods, this is pretty simple:But note, because of the architecture of CPython (namely the An alternative, for Python 2.6 and later, is to use Python's Thanks for contributing an answer to Stack Overflow! You need to use Also, there's no need to pass the mutex as an argument to the function. Private self-hosted questions and answers for your enterpriseProgramming and related technical career opportunitiesIt is very difficult to figure out what you are trying to do. You'll need to explain your intent in more detail. A mutex has two pieces of state — a “locked” bit and a queue. I haven't tested this code yet and it probably won't even work. The preferred way to use a Lock is an async with statement: site design / logo © 2020 Stack Exchange Inc; user contributions licensed under
Or, where can I find info on which filesystems don't lock correctly?Thanks, but "multiprocessing" doesn't appear to be what I need; see the edited question.The section you linked to appears to show how a master process can spawn 10 processes, passing a Lock object to each one it creates. You win some, you lose some.The POSIX standard specifies inter-process semaphores which can be used for this purpose. Stack Overflow works best with JavaScript enabled The most common way to do this is called Lock in Python. Create a new (unlocked) mutex. would this algorithm be the right usage of a Mutex? The downside is that you need a place for this lock file to live; also, some filesystems don't actually lock correctly, so there's a risk that it will silently fail to achieve exclusion. The Overflow Blog @Marcelo Cantos, sorry you are probably right. Good points all the same, though.My Debian Squeeze install doesn't have a tmpfs /tmp either. but hey, that's why I am here asking for help.I don't know why you're using the Window's Mutex instead of Python's. This approach also has the perk that non-Python programs can participate in your locking. Using the Python methods, this is pretty simple: from threading import Thread, Lock mutex = Lock() def processData(data): mutex.acquire() try: print('Do some stuff') finally: mutex.release() while True: t = Thread(target = processData, args = (some_data,)) t.start() You can use lockf(3) to lock sections of a file so that other processes can't edit it; a very common abuse is to use this as a mutex between processes. TemporaryFileLock has race issues. By using our site, you acknowledge that you have read and understand our
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