Added a few classes to the debug kit:

* BDebugMessageHandler: Interface with hooks for handling of debug messages.
* BDebugContext: Essentially a C++ wrapper for struct debug_context, with
  handy methods for controlling a debugged team.
* BTeamDebugger: Proxy for a debugged team. Derived from BDebugContext.
* BDebugLooper: Wraps a main debug message loop. Any number of BTeamDebuggers
  can be added and associated with BDebugMessageHandlers.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35953 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/debug/DebugLooper.h

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2010, Ingo Weinhold, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _DEBUG_LOOPER_H
+#define _DEBUG_LOOPER_H
+
+
+#include <Locker.h>
+
+#include <ObjectList.h>
+
+
+class BDebugMessageHandler;
+class BTeamDebugger;
+
+
+class BDebugLooper {
+public:
+								BDebugLooper();
+	virtual						~BDebugLooper();
+
+			status_t			Init();
+
+			thread_id			Run(bool spawnThread);
+			void				Quit();
+
+			status_t			AddTeamDebugger(BTeamDebugger* debugger,
+									BDebugMessageHandler* handler);
+			bool				RemoveTeamDebugger(BTeamDebugger* debugger);
+			bool				RemoveTeamDebugger(team_id team);
+
+private:
+			struct Debugger;
+
+			struct Job;
+			struct JobList;
+			struct AddDebuggerJob;
+			struct RemoveDebuggerJob;
+
+			friend struct AddDebuggerJob;
+			friend struct RemoveDebuggerJob;
+
+			typedef BObjectList<Debugger> DebuggerList;
+
+private:
+	static	status_t			_MessageLoopEntry(void* data);
+			status_t			_MessageLoop();
+
+			status_t			_DoJob(Job* job);
+			void				_Notify();
+
+private:
+			BLocker				fLock;
+			thread_id			fThread;
+			bool				fOwnsThread;
+			bool				fTerminating;
+			bool				fNotified;
+			JobList*			fJobs;
+			sem_id				fEventSemaphore;
+			DebuggerList		fDebuggers;
+};
+
+
+#endif	// _DEBUG_LOOPER_H