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/include/senseApis/senseApiManager.h

@@ -11,6 +11,7 @@
 #include <asynchronousLoop.h>
 #include <senseApis/senseApiLib.h>
 #include <user/deviceAttachmentSpec.h>
+#include <callback.h>
 
 namespace smo {
 namespace sense_api {
@@ -54,10 +55,10 @@ public:
 
 	void attachSenseDeviceReq(
         const std::shared_ptr<device::DeviceAttachmentSpec>& spec,
-        attachSenseDeviceReqCbFn cb);
+        Callback<attachSenseDeviceReqCbFn> cb);
     void detachSenseDeviceReq(
         const std::shared_ptr<device::DeviceAttachmentSpec>& spec,
-        detachSenseDeviceReqCbFn cb);
+        Callback<detachSenseDeviceReqCbFn> cb);
 
 	typedef std::function<void(AsynchronousLoop &results)>
 		attachAllSenseDevicesFromSpecsReqCbFn;
@@ -65,9 +66,9 @@ public:
 		detachAllSenseDevicesReqCbFn;
 
 	void attachAllSenseDevicesFromSpecsReq(
-		attachAllSenseDevicesFromSpecsReqCbFn cb);
+		Callback<attachAllSenseDevicesFromSpecsReqCbFn> cb);
 	void detachAllSenseDevicesReq(
-		detachAllSenseDevicesReqCbFn cb);
+		Callback<detachAllSenseDevicesReqCbFn> cb);
 
     std::string stringifyLibs() const;