Async: add sh_ptr<ContinuationChainLink> to Callback<>

This change enables us to finally implement the tracing of
continuations backward from the point of acquisition for deadlock
debugging.

smocore/deviceManager/deviceManager.cpp

@@ -7,6 +7,7 @@
 #include <memory>
 #include <opts.h>
 #include <asynchronousContinuation.h>
+#include <callback.h>
 #include <deviceManager/deviceManager.h>
 #include <senseApis/senseApiManager.h>
 #include <marionette/marionette.h>
@@ -45,7 +46,7 @@ public:
 	NewDeviceAttachmentSpecInd(
 		std::shared_ptr<DeviceAttachmentSpec> s,
 		const std::shared_ptr<ComponentThread> &caller,
-		newDeviceAttachmentSpecIndCbFn cb)
+		Callback<newDeviceAttachmentSpecIndCbFn> cb)
 	:	PostedAsynchronousContinuation<newDeviceAttachmentSpecIndCbFn>(
 			caller, cb),
 	spec(s)
@@ -61,10 +62,10 @@ public:
 	{
 		sense_api::SenseApiManager::getInstance().attachSenseDeviceReq(
 			spec,
-			std::bind(
+			{context, std::bind(
 				&NewDeviceAttachmentSpecInd::newDeviceAttachmentSpecInd2,
 				context.get(), context,
-				std::placeholders::_1, std::placeholders::_2));
+				std::placeholders::_1, std::placeholders::_2)});
 	}
 
 	void newDeviceAttachmentSpecInd2(
@@ -125,14 +126,14 @@ public:
 
 void DeviceManager::newDeviceAttachmentSpecInd(
 	std::shared_ptr<DeviceAttachmentSpec> spec,
-	newDeviceAttachmentSpecIndCbFn callback)
+	Callback<newDeviceAttachmentSpecIndCbFn> callback)
 {
 	// Check if a DeviceAttachmentSpec already matches
 	for (const auto& existingSpec : deviceAttachmentSpecs)
 	{
 		if (!(*existingSpec == *spec)) { continue; }
 		// Already exists, callback with error
-		callback(false, nullptr, spec);
+		callback.callbackFn(false, nullptr, spec);
 		return;
 	}