diogo/yap-6.3
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allow peeking in dbterm queues.

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This commit is contained in:
Vítor Santos Costa 2014-10-19 01:51:02 +01:00
parent e668908a6f
commit 69d8b57776
1 changed files with 15 additions and 0 deletions
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15
C/dbase.c
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@ -5224,8 +5224,12 @@ bool
Yap_dequeue_tqueue(db_queue *father_key, Term t, bool first, bool release USES_REGS)
{
Term TDB;
CELL *oldH = HR ;
tr_fr_ptr oldTR = TR;
QueueEntry * cur_instance = father_key->FirstInQueue, *prev = NULL;
while (cur_instance) {
HR = oldH;
HB = LCL0;
while ((TDB = GetDBTerm(cur_instance->DBT, false PASS_REGS)) == 0L) {
if (LOCAL_Error_TYPE == OUT_OF_ATTVARS_ERROR) {
LOCAL_Error_TYPE = YAP_NO_ERROR;
@ -5240,6 +5244,8 @@ Yap_dequeue_tqueue(db_queue *father_key, Term t, bool first, bool release USES_R
return false;
}
}
oldTR = TR;
oldH = HR;
}
if (Yap_unify(t, TDB)) {
if (release) {
@ -5257,6 +5263,15 @@ Yap_dequeue_tqueue(db_queue *father_key, Term t, bool first, bool release USES_R
ErasePendingRefs(cur_instance->DBT PASS_REGS);
FreeDBSpace((char *) cur_instance->DBT);
FreeDBSpace((char *) cur_instance);
} else {
// undo if you'rejust peeking
while (oldTR < TR) {
CELL d1 = TrailTerm(TR-1);
TR--;
/* normal variable */
RESET_VARIABLE(d1);
}
}
return true;
} else {