From b2cd81f79a9b8a996268fc259072b3d6ff0a12a1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=ADtor=20Santos=20Costa?= <vsc@dcc.fc.up.pt>
Date: Sat, 11 Oct 2014 01:39:09 +0100
Subject: [PATCH] fix bb usage of DB.

---
 C/absmi.c | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/C/absmi.c b/C/absmi.c
index 81d2a3e52..a901084e2 100755
--- a/C/absmi.c
+++ b/C/absmi.c
@@ -3148,19 +3148,22 @@ Yap_absmi(int inp)
 #if PARALLEL_YAP
 		  PredEntry *ap = cl->ClPred;
 #endif
+		  /* BB support */
+		  if (ap) {
 
-		  PELOCK(9,ap);
-		  DEC_CLREF_COUNT(cl);
-		  erase = (cl->ClFlags & ErasedMask) && !(cl->ClRefCount);
-		  if (erase) {
-		    saveregs();
-		    /* at this point,
-		       we are the only ones accessing the clause,
-		       hence we don't need to have a lock it */
-		    Yap_ErLogUpdCl(cl);
-		    setregs();
+		    PELOCK(9,ap);
+		    DEC_CLREF_COUNT(cl);
+		    erase = (cl->ClFlags & ErasedMask) && !(cl->ClRefCount);
+		    if (erase) {
+		      saveregs();
+		      /* at this point,
+			 we are the only ones accessing the clause,
+			 hence we don't need to have a lock it */
+		      Yap_ErLogUpdCl(cl);
+		      setregs();
+		    }
+		    UNLOCK(ap->PELock);
 		  }
-		  UNLOCK(ap->PELock);
 		}
 	      } else {
 		DynamicClause *cl = ClauseFlagsToDynamicClause(pt1);