Michael wrote:
> I'm writing a decorator that I never want to be nested. Following from the
> answer on my StackOverflow question
> (http://stackoverflow.com/a/16905779/106244), I've adapted it to the
> following.
>
> Can anyone spot any issues with this? It'll be run in a multi-threaded
> environment serving Django requests and also be a part of Celery tasks.
I'm not sure I understand what you are trying to do, but this
> if not within_special_wrapper():
> with flag():
looks suspiciously like race condition.
> thread_safe_globals = threading.local()
I'm not an expert in the area, but I think you need a lock, something like
class NestingError(Exception):
pass
nest_lock = threading.Lock()
def my_special_wrapper(f):
@wraps(f)
def internal(*args, **kwargs):
if nest_lock.acquire(False): # non-blocking
try:
f(*args, **kwargs)
finally:
nest_lock.release()
else:
raise NestingError
return internal
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