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From: jos@cs.vu.nl (Jos Warmer)
Newsgroups: comp.lang.eiffel
Subject: Calling eiffel-routines from C ?
Message-ID: <2135@vlot.cs.vu.nl>
Date: 9 Mar 89 10:33:21 GMT
Sender: jos@cs.vu.nl
Reply-To: jos@cs.vu.nl (Jos Warmer)
Organization: VU Informatica, Amsterdam
Lines: 24

Many window-system, written and callable from C, have the following
architecture.

You initialise your application and install some callback-functions
and tell on which event they shoul be called.

Then you give control to the window-system which takes over
everything and calls one of the installed C callback-functions when
an event happens. E.g. XtMainLoop in Xt toolkit, window_main_loop in SunView.

Using this from eiffel poses the problem that the C window-system takes
over and needs to call eiffel-routines (not C), otherwise eiffel loses
control altogether.

Is it possible in eiffel to make C functions call eiffel-routines.
I know it is in standalone C packages, but that's not what I need.

Or does anyone know another solution ?

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                                 Jos Warmer
				 jos@cs.vu.nl
				 ...uunet!mcvax!cs.vu.nl!jos
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