Re: GUI updates do not show even from separate thread

[Riccardo Mottola]

Hi,

Fred Kiefer wrote:
> Hi Riccardo,
>
> I tried to inspect this issue, but already failed in getting FTP.app to work 
> against ftpmain.gnustep.org. Are there any ftp sites out there where you know 
> the code is working correctly.

That's bad! It works for me right with ftp.gnustep.org which is my 
favourite test use case!
In "preferences" what connection mode is set? Port and Passive are the 
ones that usually do work and both work for me with GNUstep. standard is 
often blocked or misinterpreted by routers and firewalls.
may you change to Passive or vice-versa and see if it works?

> Next I looked at the code and failed to see the point where a background thread 
> for the file download gets started. There is only one reference to NSThread in 
> the code and this is at the startup. No idea what this code is doing there.

The "connection" is started in a background thread and then lives on in 
all various operation, not just the single download operation. At least, 
I think that was my intention many years ago. That way, for example, 
recursive downloads operate in a single worker thread and don't spawn N 
threads, N being the depth !

How to know if I really have 2 threads and the code is not buggy?
I set a breakpoint in retrieveFile and gdb "info threads" shows me two 
threads and execution being in #2. I hope this is enough for a proof.

> In AppController setTransferProgress: you are most likely referring to the line
> [progBar setDoubleValue:percent];
> This should indeed update the progress bar the next time GNUstep redraws the 
> window. And even if you don't use a background thread the NSRunloop trick 
> should be enough to trigger this. Without being able to get this working it is 
> hard to say anything more. What you could try to find out is whether the 
> drawRect: method of the progress indicator gets called at all. It could be that 
> it is in a state where it just doesn't draw anything.

I do not only update the progress  bar, but also the text fields showing 
transferred bytes and speed. Those to do not get updated too. I suppose 
thus that it is not just the progress bar component.

Riccardo