Re: Setjmp(), longjmp() in gnuplot

[Ethan M. <merritt@u.washington.edu>]

Caveat: I don't really understand how your new terminal type is supposed
to work.  So maybe I have the wrong end of the stick here...

On Friday 24 June 2005 11:45 am, Timoth=C3=A9e Lecomte wrote:
>=20
> As far as I understand, this would be perfect if I had not to use a=20
> separate thread for my terminal. Indeed, I want to send a command from=20
> the terminal (through a menu for example) to gnuplot. I use events=20
> defined in mouse.c, and more precisely a "command" event (which doesn't=20
> seem to be used very often, or maybe in OS/2 only). The do_event(event)=20
> is executed in my gui thread. When an error appears on the command, we=20
> obtain a longjump which is invalid for *this* gui thread... and it ends=20
> with a segmentation fault.

I would think the proper fix is to re-initialize the longjump at the
start of each thread creation.  Then if you get an error it will jump
to a per-thread error handler and exit the thread cleanly.

> Another solution would be to build the terminal as a separate process,=20
> like x11 or os/2 ones. But I think it's not an optimal design.
> So I would be pleased if somebody can give me a tip in order to deal=20
> with this issue ;-) .

I might understand better if you would briefly describe the flow of
control you are trying to achieve.  What does the new terminal type do
that existing terminals do not handle already?  Is the user expected to run
gnuplot from a command line, but when 'set term wxwidgets' is selected a=20
separate control window appears?   Or does the user run a wrapping program
that executes gnuplot underneath with the terminal pre-set to communicate w=
ith
the wrapping layer? =20

If it's the latter, then I'm not sure you even  need a new terminal type.
You may be able to use 'set term x11' and direct the output to an embedded
panel of the wrapping program (see patchset #1027032).  I'm not saying this
is the best thing to do, but I point it out as a possibility.
=20


=2D-=20
Ethan A Merritt       merritt@u.washington.edu
Biomolecular Structure Center
Mailstop 357742
University of Washington, Seattle, WA 98195