Hello everyone.
As suggested by Markus on django-users group, I'm posting this here too.
---
I'm using django (1, 10, 0, u'beta', 1).
When I try to reverse url in shell everything goes fine.
When under nginx/uwsgi with many concurrent request I get
... /local/lib/python2.7/site-packages/
Hey,
thanks for posting this here. I opened
https://code.djangoproject.com/ticket/26888 to keep track of this. Can I
get somebody with threading experience in Python tell me if your
proposed patch makes sense?
Also, I marked this as a release blocker for 1.10 as I introduced this
during a patch
Wouldn't a standard Lock do the trick? Also you are still vulnerable to a
race condition when reading self._populating, if the goal is to avoid
populating the object more than once in a short interval (in a case where
multiple requests hit the server before the object is initialized for the
fir
Sorry for my above answer I think the actual locks should go like this, so
all threads can actually go to the wait line while _populating is True.
def _populate(self):
self.lock.acquire()
if self._populating:
self.lock.wait()
self.lock.release()
return
Hello,
Can you check the condition inside the lock? The following pattern seems
simpler to me:
def _populate(self):
with self._lock:
if self._populated:
return
# … populate …
self._populated = True
You can look at Apps.populate for an example of this patt
Indeed that code is much simpler as long as the changed behaviour of the
populated/populating flag doesn't break anything.
El martes, 12 de julio de 2016, 4:25:37 (UTC-3), Aymeric Augustin escribió:
>
> Hello,
>
> Can you check the condition inside the lock? The following pattern seems
> simpler
> On 12 Jul 2016, at 14:23, Cristiano Coelho wrote:
>
> Indeed that code is much simpler as long as the changed behaviour of the
> populated/populating flag doesn't break anything.
I didn’t check the details; most likely you can reuse the structure but you
need to adjust the variable names and
On Tue, Jul 12, 2016 at 3:25 AM Aymeric Augustin <
aymeric.augus...@polytechnique.org> wrote:
> def _populate(self):
> with self._lock:
> if self._populated:
> return
> # … populate …
> self._populated = True
>
Depending on how frequently the code is called
On Tuesday, July 12, 2016 at 9:25:37 AM UTC+2, Aymeric Augustin wrote:
>
> Can you check the condition inside the lock? The following pattern seems
> simpler to me:
>
The standard pattern in such cases is to check inside and outside. Outside
to avoid the lock if you already populated (the majo
> On 12 Jul 2016, at 19:46, Florian Apolloner wrote:
>
> On Tuesday, July 12, 2016 at 9:25:37 AM UTC+2, Aymeric Augustin wrote:
> Can you check the condition inside the lock? The following pattern seems
> simpler to me:
>
> The standard pattern in such cases is to check inside and outside. Outs
Keep in mind your code guys is semantically different from the one of the
first post.
In the first post, the _populate method can be called more than once, and
if the time window is long enough, the two or more calls will eventually
run the # ... populate code again, but on your code, the popul
It's not quite as simple. Concurrency is actually not the main issue here.
The issue is that self._populate() only populates the app_dict, namespace_dict
and reverse_dict for the currently active language. By short-circuiting if
the resolver is populating, you have the chance to short-circuit wh
If you are using locals it means each thread will always end up calling the
actual populate code? Is there any point for the RegexURLResolver class to
be a singleton then?
El jueves, 14 de julio de 2016, 9:12:54 (UTC-3), Marten Kenbeek escribió:
>
> It's not quite as simple. Concurrency is actu
Using a singleton means that everything is cached for the lifetime of the
process after the resolver has been populated. The thread-local is so that
concurrent calls to _populate() can correctly determine if it is a
recursive call within the current thread. _populate() is called *at most*
once
Thanks everybody!
While Aymeric's sounded great, your reasoning sounds even better,
Marten. Thanks!
Do you want to provide a PR for that, Marten?
Cheers,
/Markus
On Thu, Jul 14, 2016 at 06:47:15AM -0700, Marten Kenbeek wrote:
Using a singleton means that everything is cached for the lifetime
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