X-Git-Url: http://plrg.eecs.uci.edu/git/?p=c11tester.git;a=blobdiff_plain;f=clockvector.cc;h=9820b8f986b8ba93c465674212d2967e1104fd96;hp=c86995bc9bbb555cf9e2381d1b7df91036330a46;hb=7742256df627848c1c375f979f5369a45c92057b;hpb=368dcf3baf2ef233bc752474d23bea77f22b2edd

diff --git a/clockvector.cc b/clockvector.cc
index c86995bc..9820b8f9 100644
--- a/clockvector.cc
+++ b/clockvector.cc
@@ -18,8 +18,7 @@
  */
 ClockVector::ClockVector(ClockVector *parent, const ModelAction *act)
 {
-	ASSERT(act);
-	num_threads = int_to_id(act->get_tid()) + 1;
+	num_threads = act != NULL ? int_to_id(act->get_tid()) + 1 : 0;
 	if (parent && parent->num_threads > num_threads)
 		num_threads = parent->num_threads;
 
@@ -27,7 +26,8 @@ ClockVector::ClockVector(ClockVector *parent, const ModelAction *act)
 	if (parent)
 		std::memcpy(clock, parent->clock, parent->num_threads * sizeof(modelclock_t));
 
-	clock[id_to_int(act->get_tid())] = act->get_seq_number();
+	if (act != NULL)
+		clock[id_to_int(act->get_tid())] = act->get_seq_number();
 }
 
 /** @brief Destructor */
@@ -62,6 +62,32 @@ bool ClockVector::merge(const ClockVector *cv)
 	return changed;
 }
 
+/**
+ * Merge a clock vector into this vector, using a pairwise comparison. The
+ * resulting vector length will be the maximum length of the two being merged.
+ * @param cv is the ClockVector being merged into this vector.
+ */
+bool ClockVector::minmerge(const ClockVector *cv)
+{
+	ASSERT(cv != NULL);
+	bool changed = false;
+	if (cv->num_threads > num_threads) {
+		clock = (modelclock_t *)snapshot_realloc(clock, cv->num_threads * sizeof(modelclock_t));
+		for (int i = num_threads;i < cv->num_threads;i++)
+			clock[i] = 0;
+		num_threads = cv->num_threads;
+	}
+
+	/* Element-wise minimum */
+	for (int i = 0;i < cv->num_threads;i++)
+		if (cv->clock[i] < clock[i]) {
+			clock[i] = cv->clock[i];
+			changed = true;
+		}
+
+	return changed;
+}
+
 /**
  * Check whether this vector's thread has synchronized with another action's
  * thread. This effectively checks the happens-before relation (or actually,