librelist archives

on timers

From:

J. Kaiden

Date:

2011-10-25 @ 23:40

hey folks,

  i noticed an interesting issue (to me anyway) using Shoes timers in my
audio player app.  i was getting segfaults thrown at me when closing the
main_app window after i had started a timer...

  here's the progress method that moves the arm of the record player in my
would-be app:

def xprogress
@timer.remove if @timer
@timer = every(0.25){
if @wax.state == "playing"
if @wax.dur > 0
x = (-5.5 / @wax.dur.to_f).round(3)
@arm.rotate(x)
end
end
}
end

  i've also used `@timer = animate(4)`, and gotten the same segfault.

  i replaced this method with the one i used in the gtk2 version of the
player.  this version of the method relies on glib2, which i built into my
shoes - so i'm not sure (and don't think) that it will work with most
shoes...

def progress
GLib::Timeout.add(100){
if @wax.state == "playing"
if @wax.dur > 0
@arm.rotate(-0.57 / @wax.dur.to_f)
end
end
}
end

  anyway, this doesn't give me any errors when i close the app...  any ideas
what might be going on?  does it even matter?

  Shoes On,

  - j

It does matter, and it doesn't. If we could get it down to a tiny
case, we could make a bit more sense of it. Segfaults are bad. I'd
like to get rid of them.

hey Steve,

  trying to get it down to a small not-working example, with no luck yet...
 if/when i do i'll post it here.  think it might just be a question of a
million things piled on top of each other.  now that it's stripped down,
i'll start piling them on one by one again, and see where it breaks...

  thanks,

  - j

Totally. And it's better to know that it does it sometimes than not,
so thanks for letting us know regardless! _why's C code... has some
bad things in it sometimes. I'm working on improving the overall
quality, but these things take time.

On Wed, Oct 26, 2011 at 5:18 PM, Steve Klabnik <steve@steveklabnik.com>wrote:

> ... I'm working on improving the overall quality, but these things take
> time.
>

  thanks again for all the effort - Shoes is a truly enjoyable experience...
 once i've got this thing finished i'm thinking of writing something of a
comparison between creating the beast in gtk2 vs. in shoes...

  wish i could help more than just complaining when stuff goes wrong for me!
 i'm working on learning more C to try and understand better what goes on
under the hood - but that too takes time!  i'll certainly get back when i
figure out what the straw that breaks the timer's back is...

Shoes On,

  - j

No worries! Answering questions on the ML is super helpful as well. :)