5affad32b6
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1886 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
44 lines
1.1 KiB
Prolog
44 lines
1.1 KiB
Prolog
/*************************************************************************
|
|
* *
|
|
* YAP Prolog *
|
|
* *
|
|
* Yap Prolog was developed at NCCUP - Universidade do Porto *
|
|
* *
|
|
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
|
|
* *
|
|
**************************************************************************
|
|
* *
|
|
* File: timeout.yap *
|
|
* Last rev: 5/12/99 *
|
|
* mods: *
|
|
* comments: Goal within timeout *
|
|
* *
|
|
*************************************************************************/
|
|
|
|
:- module(timeout, [
|
|
time_out/3
|
|
]).
|
|
|
|
:- meta_predicate time_out(:,+,-).
|
|
|
|
%
|
|
% not the nicest program I've ever seen.
|
|
%
|
|
time_out(Goal, Time, Result) :-
|
|
T is Time//1000,
|
|
UT is (Time mod 1000)*1000,
|
|
% enable alarm
|
|
alarm(T.UT,throw(time_out),_),
|
|
% launch goal and wait for signal
|
|
( catch(Goal, time_out, Result = time_out)
|
|
% make sure to disable alarm
|
|
->
|
|
alarm(0,_,_)
|
|
;
|
|
alarm(0,_,_),
|
|
fail
|
|
),
|
|
% just couldn't resist...
|
|
(Result = success -> true ; true).
|
|
|