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+/** 
+ * @file lleventtimer.h
+ * @brief Cross-platform objects for doing timing 
+ *
+ * $LicenseInfo:firstyear=2000&license=viewergpl$
+ * 
+ * Copyright (c) 2000-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_EVENTTIMER_H					
+#define LL_EVENTTIMER_H
+
+#include "stdtypes.h"
+#include "lldate.h"
+#include "llinstancetracker.h"
+#include "lltimer.h"
+
+// class for scheduling a function to be called at a given frequency (approximate, inprecise)
+class LL_COMMON_API LLEventTimer : protected LLInstanceTracker<LLEventTimer>
+{
+public:
+	LLEventTimer(F32 period);	// period is the amount of time between each call to tick() in seconds
+	LLEventTimer(const LLDate& time);
+	virtual ~LLEventTimer();
+	
+	//function to be called at the supplied frequency
+	// Normally return FALSE; TRUE will delete the timer after the function returns.
+	virtual BOOL tick() = 0;
+
+	static void updateClass();
+
+protected:
+	LLTimer mEventTimer;
+	F32 mPeriod;
+};
+
+#endif //LL_EVENTTIMER_H