Qutex: currOwner should use registered sh_ptr to Lockvoker

This ensures that the Lockvoker object we access from currOwner
remains valid past the lifetime of the Lockvoker object that
gets copied and invoked by boost::asio

include/asynchronousContinuation.h

@@ -68,7 +68,7 @@ public:
 
 	// Implement the virtual method from AsynchronousContinuationChainLink
 	virtual std::shared_ptr<AsynchronousContinuationChainLink>
-	getCallersContinuation() override
+	getCallersContinuationShPtr() override
 		{ return originalCallback.callerContinuation; }
 
 public:

include/asynchronousContinuationChainLink.h

@@ -20,7 +20,7 @@ public:
     virtual ~AsynchronousContinuationChainLink() = default;
 
 	virtual std::shared_ptr<AsynchronousContinuationChainLink>
-	getCallersContinuation() = 0;
+	getCallersContinuationShPtr() = 0;
 };
 
 } // namespace smo

include/lockerAndInvokerBase.h

@@ -37,7 +37,7 @@ public:
 	 * @param qutex The Qutex to get the iterator for
 	 * @return Iterator pointing to this lockvoker in the Qutex's queue
 	 */
-	virtual List::iterator getLockvokerIteratorForQutex(Qutex& qutex) = 0;
+	virtual List::iterator getLockvokerIteratorForQutex(Qutex& qutex) const = 0;
 
 	/**
 	 * @brief Awaken this lockvoker by posting it to its io_service

include/qutex.h

@@ -90,13 +90,14 @@ public:
 	void release();
 
 #ifdef CONFIG_ENABLE_DEBUG_LOCKS
-	LockerAndInvokerBase* getCurrOwner() const { return currOwner; }
+	std::shared_ptr<LockerAndInvokerBase> getCurrOwner() const
+		{ return currOwner; }
 #endif
 
 public:
 #ifdef CONFIG_ENABLE_DEBUG_LOCKS
 	std::string name;
-	LockerAndInvokerBase* currOwner;
+	std::shared_ptr<LockerAndInvokerBase> currOwner;
 #endif
 	SpinLock lock;
 	LockerAndInvokerBase::List queue;

include/serializedAsynchronousContinuation.h

@@ -154,7 +154,7 @@ public:
 		 * @return Iterator pointing to this lockvoker in the Qutex's queue
 		 */
 		LockerAndInvokerBase::List::iterator
-		getLockvokerIteratorForQutex(Qutex& qutex) override
+		getLockvokerIteratorForQutex(Qutex& qutex) const override
 		{
 			return serializedContinuation.requiredLocks.getLockUsageDesc(
 				qutex).second;