GNU bug report logs - #22534
File notify broken on Windows

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From: Fabrice Popineau <fabrice.popineau <at> gmail.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 22534 <at> debbugs.gnu.org
Subject: bug#22534: File notify broken on Windows
Date: Thu, 4 Feb 2016 10:49:42 +0100

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A couple of my findings :

- notifications returned are not the same whether you run the tests in
batch mode or interactive mode.
  In interactive mode, there is a deleted notification which is sent when
your remove the directory being watched.
  This event is not seen when running in batch mode (make check). I wonder
what could make a difference.
- in the test file-notify-test06-many-events to check that events are not
dropped : I have to lower the 1000 number.
  The test fails as soon as I go higher than around 260. Is there some
limit here ? Once the limit is reached, only
  the first notification is returned.
- there is this small patch that needs to be applied :

diff --git a/test/automated/file-notify-tests.el
b/test/automated/file-notify-tests.el
index de64f50..51a898e 100644
--- a/test/automated/file-notify-tests.el
+++ b/test/automated/file-notify-tests.el
@@ -507,7 +509,7 @@ file-notify--test-with-events
               ;; w32notify does not distinguish between `changed' and
               ;; `attribute-changed'.
               ((string-equal (file-notify--test-library) "w32notify")
-               '(changed changed changed changed))
+               '(changed changed))
               ;; For kqueue and in the remote case, `write-region'
               ;; raises also an `attribute-changed' event.
               ((or (string-equal (file-notify--test-library) "kqueue")

Overall, I don't think anymore that the patch by Michael has broken w32
file notifications
but rather that the new tests have highlighted some potential problems with
it.

Regards,

Fabrice


2016-02-03 13:15 GMT+01:00 Fabrice Popineau <fabrice.popineau <at> gmail.com>:

>
>
> 2016-02-03 9:07 GMT+01:00 Michael Albinus <michael.albinus <at> gmx.de>:
>
>> Fabrice Popineau <fabrice.popineau <at> gmail.com> writes:
>>
>> > You will find the commit below (with not too much surprise).
>> > However, I don't have much time these days to sort this out.
>>
>> I'll check next days, need to find an MS Windows machine first.
>>
>>
> Thanks Michael.
>
> I have observed something weird during the file-notify tests.
> I traced file-notify-test02-events.
> The read_event function doesn't time out in 0.1s as it is supposed to.
> It waits for the time specified  by (file-notify--test-timeout) before
> returning the right value. (Well actually, the value returned by the third
> test
> in file-notify-test02-events is wrong but it is another story).
>
> So I'm afraid some logic is wrong, and possibly not only in file-notify
> but also in the way w32 should handle those timeouts.
>
> Fabrice
>
>

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