QtxHistTracker: Print message on heuristic gridlock find

smocore/qutexAcquisitionHistoryTracker.cpp

@@ -4,6 +4,7 @@
 #include <memory>
 #include <forward_list>
 #include <functional>
+#include <iostream>
 
 namespace smo {
 
@@ -125,11 +126,18 @@ bool QutexAcquisitionHistoryTracker
 			/* Found firstFailedQutex in another continuation's held locks
 			 * This indicates a potential gridlock
 			 */
-			if (&heldLock.get() == &firstFailedQutex)
-			{
-				acquisitionHistoryLock.release();
-				return true;
-			}
+			if (&heldLock.get() != &firstFailedQutex)
+				{ continue; }
+
+			acquisitionHistoryLock.release();
+
+			std::cerr << __func__ << ": GRIDLOCK DETECTED: Current "
+				"continuation @" << currentContinuation.get()
+				<< " wants lock '" << firstFailedQutex.name
+				<< "' which is held by continuation @"
+				<< continuation.get() << std::endl;
+
+			return true;
 		}
 	}