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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 If the execution fails, garbage collection might still have changed
the term, so you should not use the input argument again. 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}) @item @code{int} YAP_RestartGoal(@code{void})
@findex YAP_RestartGoal/0 @findex YAP_RestartGoal/0
Look for the next solution to the current query by forcing YAP to backtrack. Look for the next solution to the current query by forcing YAP to backtrack.