[compiz] [PATCH] Remove timeout callback

David Reveman davidr at novell.com
Mon Apr 23 08:58:48 PDT 2007

On Mon, 2007-04-23 at 16:14 +0100, Mike Dransfield wrote:
> David Reveman wrote:
> > On Mon, 2007-04-23 at 14:28 +0100, Mike Dransfield wrote:
> >   
> >> While working on the python plugin, I realised that the
> >> timeout system does not allow for notification when a timeout
> >> is removed.  This has been fine up until now because he closures
> >> never needed to be cleaned up.
> >>
> >> In the python plugin, I pass through a custom structure which
> >> needs to be cleaned up if the timeout is removed.  This is almost
> >> certainly the cause of some horrible memory leaks for me.
> >>
> >> The attached patch is a simple solution to the problem.  I think
> >> it should be good enough for most situations.
> >>
> >> I could maintain some sort of lookup inside my plugin, but I think
> >> other plugins would benefit from this.
> >>
> >> It is OK to go in or were there any comments?
> >>     
> >
> > Timeouts are only removed as a result of the timeout call-back function
> > returning FALSE. So unless I'm missing something, all cleanup can be
> > done in the regular call-back function before returning FALSE.
> >
> >   
> The pyplane (and the original plane) use a timeout which gets
> canceled if the user quickly switches back to another viewport.
> It is not a problem for plane because the closure is a CompScreen
> which does not need to be cleaned up.
> The plugins call compRemoveTimeout to stop it.  I'm not sure if this
> is right in this case, but it seems that it would be useful to stop a
> timeout before it expires, and it makes it easy to clean up the closure
> without having to maintain a lookup table of handles to closures.

OK, I see. 

1. compRemoveTimeout can return the closure pointer.

2. We add a function like this:

void *
compTimeoutGetUserData (CompTimeoutHandle handle);

3. We add a remove call-back function (your patch).

I'm in favor of solution 1, it's simple and efficient. What do you

- David

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