Re: Event loop

[G Hasse <gh raditex se>]

On Mon, 13 Nov 2000, Nils Rennebarth wrote:

> On Sat, Nov 11, 2000 at 02:08:20PM -0500, Havoc Pennington wrote:
> > The easiest way to do this type of thing in GTK is usually to put
> > do_something() in an idle handler.
> >
> > Pretty much any _something() can simply be integrated into the GLib
> > main loop instead of doing your own busy loop.
> In my application I have to save a 1MB image to a file using .png which
> takes a lot of time on that oldish P166. What would you suggest to use for
> saving the image "in the background"?
>
> - separate process
> - use threads
> - do the writing in an idle handler
>
> If I use a different process, I need to transfer a lot of data and returning
> error messages or progress messages to the user is much work.

You should memorymap the file (mmap) and spawn a separate process.
Prevention of update you do with a semaphore.

GH

> An idle handler also needs to split the task of writing the file to write
> several lines or how else do I prevent the handler from taking 5 seconds
> in a row once it has been started?
>
> Nils
>
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