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diff --git a/indra/llcommon/llcallbacklist.h b/indra/llcommon/llcallbacklist.h
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+/** 
+ * @file llcallbacklist.h
+ * @brief A simple list of callback functions to call.
+ *
+ * $LicenseInfo:firstyear=2001&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLCALLBACKLIST_H
+#define LL_LLCALLBACKLIST_H
+
+#include "llstl.h"
+#include <boost/function.hpp>
+#include <list>
+
+class LLCallbackList
+{
+public:
+	typedef void (*callback_t)(void*);
+
+	typedef std::pair< callback_t,void* >	callback_pair_t;
+	// NOTE: It is confirmed that we DEPEND on the order provided by using a list :(
+	//
+	typedef std::list< callback_pair_t >	callback_list_t; 
+	
+	LLCallbackList();
+	~LLCallbackList();
+
+	void addFunction( callback_t func, void *data = NULL );			// register a callback, which will be called as func(data)
+	bool containsFunction( callback_t func, void *data = NULL );	// true if list already contains the function/data pair
+	bool deleteFunction( callback_t func, void *data = NULL );		// removes the first instance of this function/data pair from the list, false if not found
+	void callFunctions();														// calls all functions
+	void deleteAllFunctions();
+
+	static void test();
+
+protected:
+
+	inline callback_list_t::iterator find(callback_t func, void *data);
+
+	callback_list_t	mCallbackList;
+};
+
+typedef boost::function<void ()> nullary_func_t;
+typedef boost::function<bool ()> bool_func_t;
+
+// Call a given callable once in idle loop.
+void doOnIdleOneTime(nullary_func_t callable);
+
+// Repeatedly call a callable in idle loop until it returns true.
+void doOnIdleRepeating(bool_func_t callable);
+
+// Call a given callable once after specified interval.
+void doAfterInterval(nullary_func_t callable, F32 seconds);
+
+// Call a given callable every specified number of seconds, until it returns true.
+void doPeriodically(bool_func_t callable, F32 seconds);
+
+extern LLCallbackList gIdleCallbacks;
+
+#endif