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/componentThread.h

@@ -12,6 +12,7 @@
 #include <sched.h>
 #include <unistd.h>
 #include <memory>
+#include <callback.h>
 
 namespace smo {
 
@@ -137,10 +138,10 @@ public:
 
 	// Thread management methods
 	typedef std::function<void()> threadLifetimeMgmtOpCbFn;
-	void startThreadReq(threadLifetimeMgmtOpCbFn callback);
-	void exitThreadReq(threadLifetimeMgmtOpCbFn callback);
-	void pauseThreadReq(threadLifetimeMgmtOpCbFn callback);
-	void resumeThreadReq(threadLifetimeMgmtOpCbFn callback);
+	void startThreadReq(Callback<threadLifetimeMgmtOpCbFn> callback);
+	void exitThreadReq(Callback<threadLifetimeMgmtOpCbFn> callback);
+	void pauseThreadReq(Callback<threadLifetimeMgmtOpCbFn> callback);
+	void resumeThreadReq(Callback<threadLifetimeMgmtOpCbFn> callback);
 
 	/**
 	 * JOLTs this thread to begin processing after global initialization.
@@ -149,7 +150,7 @@ public:
 	 * event loops and set up TLS vars after all global constructors have
 	 * completed. This prevents race conditions during system startup.
 	 */
-	void joltThreadReq(threadLifetimeMgmtOpCbFn callback);
+	void joltThreadReq(Callback<threadLifetimeMgmtOpCbFn> callback);
 
 	// CPU management methods
 	void pinToCpu(int cpuId);