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+/** 
+ * @file llthreadwatchdog.h
+ * @brief The LLThreadWatchdog class declaration
+ *
+ * $LicenseInfo:firstyear=2007&license=viewergpl$
+ * 
+ * Copyright (c) 2007, 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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_LLTHREADWATCHDOG_H
+#define LL_LLTHREADWATCHDOG_H
+
+#ifndef LL_TIMER_H					
+	#include "lltimer.h"
+#endif
+
+// LLWatchdogEntry is the interface used by the tasks that 
+// need to be watched.
+class LLWatchdogEntry
+{
+public:
+	LLWatchdogEntry();
+	virtual ~LLWatchdogEntry();
+
+	// isAlive is accessed by the watchdog thread.
+	// This may mean that resources used by 
+	// isAlive and other method may need synchronization.
+	virtual bool isAlive() const = 0;
+	virtual void start();
+	virtual void stop();
+};
+
+class LLWatchdogTimeout : public LLWatchdogEntry
+{
+public:
+	LLWatchdogTimeout();
+	virtual ~LLWatchdogTimeout();
+
+	/* virtual */ bool isAlive() const;
+	/* virtual */ void start(); 
+	/* virtual */ void stop();
+
+	void setTimeout(F32 d);
+	void ping();
+
+private:
+	LLTimer mTimer;
+	F32 mTimeout;
+};
+
+class LLWatchdogTimerThread; // Defined in the cpp
+class LLWatchdog : public LLSingleton<LLWatchdog>
+{
+public:
+	LLWatchdog();
+	~LLWatchdog();
+
+	// Add an entry to the watchdog.
+	void add(LLWatchdogEntry* e);
+	void remove(LLWatchdogEntry* e);
+
+	void init();
+	void run();
+	void cleanup();
+    
+private:
+	typedef std::set<LLWatchdogEntry*> SuspectsRegistry;
+	SuspectsRegistry mSuspects;
+	LLMutex* mSuspectsAccessMutex;
+	LLWatchdogTimerThread* mTimer;
+};
+
+#endif // LL_LLTHREADWATCHDOG_H