> Thinking of a situation where I have two "processes" running. They
> each want to operate on a list of files in the dir on a first come
> first operate basis. Once a process finishes with the file, it deletes
> it.
>
> Only one process operates on a file.
>
> I'm curious for ideas/thoughts.
Hi Bruce,
An inter-process locking approach seems straightforward: it allows us
to make sure that only one process is running a particular section of
code at once. In your case, this allows us to make sure the worker
processes don't get mixed up when deciding what to work on next.
I know that there's some built-in support for file locks in the
standard library, but on brief glance, it looks a bit low-level.
https://docs.python.org/3.6/library/fcntl.html#fcntl.lockf
... I wonder if there is a nicer API for this. I've been out of the
loop in terms of what third-party Python libraries are in vogue these
days, but let me do a few searches...
Ok, the following library might be helpful:
http://fasteners.readthedocs.io/en/latest/
http://fasteners.readthedocs.io/en/latest/examples.html#interprocess-locks
Does anyone have experience with this "fasteners" library? It looks
promising! It appears to provide a nice library for using lock files
for inter-process synchronization; their example of interprocess locks
seems straightforward.
Good luck to you!
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