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Raising Prolog exceptions from C code (2nd attempt)


From: Roberto Bagnara
Subject: Raising Prolog exceptions from C code (2nd attempt)
Date: Fri, 07 Jun 2002 18:43:35 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020516

Hi there,

I am repeating here a question I have already asked on April 10 and that
remained unanswered (sorry about that, but I am stuck).
What is the recommended way to raise a Prolog exception from foreign C code?
Is it

     Pl_Exec_Continuation(Find_Atom("throw"), 1, &t)

where t is any variable of type PlTerm?
The manual seems to suggest that, but I would like to know for sure.
Moreover, even though the simple examples work without problems,
trying to raise an exception this way from a rather complex C++
library almost always results in segmentation violations or
illegal instructions being executed.  And gdb does not seem
to be of much help debugging that.  Perhaps the Pl_Exec_Continuation
technique works only under certain circumstances, but which ones?
Is anybody out there raising exceptions from C++ code?
Thanks a lot

      Roberto

--
Prof. Roberto Bagnara
Computer Science Group
Department of Mathematics, University of Parma, Italy
http://www.cs.unipr.it/~bagnara/
mailto:address@hidden




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