#10818: EclLib should allow signals to make LISP code interruptable
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Reporter: nbruin | Owner: was
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.7
Component: interfaces | Keywords: lisp ecl signal interrupt
Author: Nils Bruin | Upstream: N/A
Reviewer: Jeroen Demeyer | Merged:
Work_issues: |
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Changes (by jdemeyer):
* cc: jdemeyer (added)
* reviewer: => Jeroen Demeyer
Old description:
> Presently, ecllib does not enable signals when executing ecl code. This
> makes LISP code uninterruptable:
> {{{
> sage: from sage.libs.ecl import *
> sage: ecl_eval("(setf i 0)")
> <ECL: 0>
> sage: inf_loop=ecl_eval("(defun infinite() (loop (incf i)))")
> sage: inf_loop() #DON'T DO THIS! (bye bye)
> }}}
> The signal handling in ECL should be studied a bit more to ensure that we
> are safely interacting with it. The attached patch just inserts
> {{{sig_on()/sig_off()}}} around the possibly slow parts. This seems to
> work, but I suspect it might leave ECL in an inconsistent state.
New description:
Presently, ecllib does not enable signals when executing ecl code. This
makes LISP code uninterruptable:
{{{
sage: from sage.libs.ecl import *
sage: ecl_eval("(setf i 0)")
<ECL: 0>
sage: inf_loop=ecl_eval("(defun infinite() (loop (incf i)))")
sage: inf_loop() #DON'T DO THIS! (bye bye)
}}}
The signal handling in ECL should be studied a bit more to ensure that we
are safely interacting with it. The attached patch just inserts
{{{sig_on()/sig_off()}}} around the possibly slow parts. This seems to
work, but I suspect it might leave ECL in an inconsistent state.
Apply [attachment:handlerswap.p2.patch]
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10818#comment:9>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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