Qutex: Add gridlock detection

include/lockerAndInvokerBase.h

@@ -45,6 +45,12 @@ public:
 	 */
 	virtual void awaken(bool forceAwaken = false) = 0;
 
+	/* These two are ued to iterate through the lockset of a Lockvoker in a
+	 * template-erased manner. We use them in the gridlock detection algorithm.
+	 */
+	virtual size_t getLockSetSize() const = 0;
+	virtual Qutex& getLockAt(size_t index) const = 0;
+
 	/**
 	 * @brief Equality operator
 	 * 

include/serializedAsynchronousContinuation.h

@@ -175,6 +175,15 @@ public:
 			target->getIoService().post(*this);
 		}
 
+		size_t getLockSetSize() const override
+			{ return serializedContinuation.requiredLocks.locks.size(); }
+
+		Qutex& getLockAt(size_t index) const override
+		{
+			return serializedContinuation.requiredLocks.locks[index]
+				.first.get();
+		}
+
 	private:
 		// Allow awakening by resetting the awake flag
 		void allowAwakening()