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git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1258 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
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vsc 2005-03-02 22:41:59 +00:00
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@ -14154,6 +14154,26 @@ collection, so you should use something like:
If the execution fails, garbage collection might still have changed
the term, so you should not use the input argument again.
An alternative is to use @emph{slots}, as shown next:
@example
long sl = YAP_InitSlot(scoreTerm);
out = YAP_RunGoal(t);
t = YAP_GetFromSlot(sl);
YAP_RecoverSlots(1);
if (out == 0) {
return FALSE;
}
}
@end example
Slots are safe houses in the stack, preserved by the garbage collector
and the stack shifter. In this case, we use a slot to preserve @var{t}
during the execution of @code{YAP_RunGoal}. When the execution of
@var{t} is over we read the (possibly changed) value of @var{t} back
from the slot @var{sl} and tell YAP that the slot @var{sl} is not
needed and can be given back to the system.
@item @code{int} YAP_RestartGoal(@code{void})
@findex YAP_RestartGoal/0
Look for the next solution to the current query by forcing YAP to backtrack.