Hi Thanks a lot for your quick reply.
I looked into using parasites for locking, but I didn't find a good way.
attach_new_parasite() seems to return successfully even if a parasite
with the same name exists, so I can only do parasite_find() and then
attach which still leaves a race condition between these two calls.
So I used file locking with fcntl. It seems to work, but it's Linux only
as far as I know.
Here's my current solution if someone else encounters the same problem:
LOCK_DIR = os.environ.get('XDG_CACHE_HOME',
os.path.join(os.environ['HOME'], '.cache'))
LOCK_FILE = os.path.join(LOCK_DIR, 'gimp-plugin-onion-layers-lock')
@contextmanager
def flocked():
with open(LOCK_FILE, "w") as fd:
try:
fcntl.flock(fd, fcntl.LOCK_EX)
yield
finally:
fcntl.flock(fd, fcntl.LOCK_UN)
Best regards
Tomaž
On 15. 09. 2018 16:31, Joao S. O. Bueno wrote:
> Plugin s are run in separate processes. I am on the mobile now, but the
> quick to type suggestion is to make your plugin put a "lock" Marci,
> either as a parasite on the image, or in a fixed name temporary file on
> the filesystem.
>
> On Sat, Sep 15, 2018, 06:18 Tomaž Šolc <tomaz.s...@tablix.org
> <mailto:tomaz.s...@tablix.org>> wrote:
>
> Hi everyone,
>
> if I assign a keyboard shortcut to a plug-in function it seems that GIMP
> will sometimes execute two instances of the function concurrently. I've
> noticed that in my onion layers plug-in: if I press the shortcut key
> faster than the function takes to execute I get the "Plug-in left image
> undo in inconsistent state" dialog. Some debug print statements in my
> Python code seem to confirm that two instances of my function were
> running at the same time.
>
> I'm wondering if it's possible to prevent that. I've tried having a
> global with Python's threading.Lock but it doesn't seem to work (I'm
> guessing two instances are executed in different interpreter contexts?)
>
> Thanks for your help,
> Tomaž
>
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