From: Juanma Barranquero <lekktu@gmail.com>
To: Lennart Borgman <lennart.borgman@gmail.com>
Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
Subject: Re: System calls without error checks in w32
Date: Mon, 31 May 2010 01:03:06 +0200 [thread overview]
Message-ID: <AANLkTinF27b0uziJtuYScRABZQEs25eG5HM6DuQPZ3NL@mail.gmail.com> (raw)
In-Reply-To: <AANLkTimZa6XsUR9ssry-CyA7SQ-30iKvT4pspIloO_Tt@mail.gmail.com>
On Mon, May 31, 2010 at 00:37, Lennart Borgman
<lennart.borgman@gmail.com> wrote:
> Yes, my intention was not to add them everywhere, only on interesting places.
It didn't seem so in your first message.
> On a quick look I got the impression that file calls are better
> handled than GUI system calls.
Likely because file calls are much more likely to fail.
> It happens to me with my patched Emacs because that is the one I am
> using. I only use unpatched Emacs for bug testing etc.
Why don't you add these checks to your patched Emacs and see what comes of it?
> That is surely true, but I am not comfortable with how threads are
> integrated (i.e. it is not visible enough IMO). I wonder if there are
> any troubles there. Those threads of course communicate through system
> calls.
Do you wonder where "there are any troubles there", or do you suspect
that there are troubles?
> I might have fixed some of the problems with related to frames which
> calls crashes, but there might be more.
Well, perhaps you've fixed them, but as I've said, your Emacs seem to
crash more often than most others ;-)
> And I wonder why Emacs sometimes seems to hang temporarily when frame
> related operations are going on. Is something going wrong?
You'd have to be a bit more specific...
> And the inability to stop Emacs sometimes is quite disturbing. What is
> going on there? Why does not the GUI thread get resources? Or is it
> given resources but a block occur in some other way? Is GUI messages
> not checked when looping?
Also here.
> This type of entering the checks is very
> similar to what `assert' does in Emacs. Does that mean you think
> `assert' is very ugly too or is there some difference I am missing?
No, I quite like asserts. The difference is than assert is
assert (some test)
There's nothing to understand there. It passes, or it fails.
W32DEBPRINT has four arguments; at the very least, if would make more
sense to do
W32DEBPRINT (this_function, ApiFunction (args) != bad_return_value)
or somesuch, and, at that point, you're just reinventing assert, which
seems pointless.
Anyway, my feeling is that it makes much more sense to check return
codes *to do something* about them in the case of failure, that just
to print a message which will be helpful or not, depending of how
frequent / how informative they are. So if you're really interested in
doing this, I'd suggest looking at specific unchecked syscalls and
trying to determine if something (could / need to) be done in case of
error. And then send patches ;-)
Juanma
next prev parent reply other threads:[~2010-05-30 23:03 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-29 2:38 System calls without error checks in w32 Lennart Borgman
2010-05-29 17:43 ` Eli Zaretskii
2010-05-29 18:42 ` Lennart Borgman
2010-05-29 19:35 ` Eli Zaretskii
2010-05-29 20:02 ` Lennart Borgman
2010-05-29 21:25 ` Eli Zaretskii
2010-05-29 21:30 ` Lennart Borgman
2010-05-30 3:02 ` Eli Zaretskii
2010-05-30 3:26 ` Lennart Borgman
2010-05-30 17:36 ` Eli Zaretskii
2010-05-30 18:02 ` Lennart Borgman
2010-05-30 19:24 ` Juanma Barranquero
2010-05-30 22:37 ` Lennart Borgman
2010-05-30 23:03 ` Juanma Barranquero [this message]
2010-05-30 23:28 ` Lennart Borgman
2010-05-31 0:10 ` Juanma Barranquero
2010-05-31 0:58 ` Lennart Borgman
2010-05-31 2:02 ` Juanma Barranquero
2010-05-31 2:36 ` Lennart Borgman
2010-05-31 3:06 ` Juanma Barranquero
2010-05-31 3:05 ` Eli Zaretskii
-- strict thread matches above, loose matches on Subject: below --
2010-05-31 9:18 grischka
2010-06-05 17:15 ` Jason Rumney
2010-06-07 10:37 ` grischka
2010-06-07 14:54 ` Stephen J. Turnbull
2010-06-07 15:23 ` Lennart Borgman
2010-06-07 17:21 ` grischka
2010-06-07 17:30 ` Lennart Borgman
2010-06-07 18:54 ` grischka
2010-06-08 0:32 ` Lennart Borgman
2010-06-08 0:34 ` Lennart Borgman
2010-06-07 19:56 ` Stefan Monnier
2010-06-07 23:35 ` Lennart Borgman
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