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+/** 
+ * @file llthreadwatchdog.h
+ * @brief The LLThreadWatchdog class declaration
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * 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_LLTHREADWATCHDOG_H
+#define LL_LLTHREADWATCHDOG_H
+
+#include <boost/function.hpp>
+
+#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 reset() = 0;
+	virtual void start();
+	virtual void stop();
+};
+
+class LLWatchdogTimeout : public LLWatchdogEntry
+{
+public:
+	LLWatchdogTimeout();
+	virtual ~LLWatchdogTimeout();
+
+	/* virtual */ bool isAlive() const;
+	/* virtual */ void reset();
+	/* virtual */ void start() { start(""); }
+	/* virtual */ void stop();
+
+	void start(const std::string& state); 
+	void setTimeout(F32 d);
+	void ping(const std::string& state);
+	const std::string& getState() {return mPingState; }
+
+private:
+	LLTimer mTimer;
+	F32 mTimeout;
+	std::string mPingState;
+};
+
+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);
+
+	typedef boost::function<void (void)> killer_event_callback;
+
+	void init(killer_event_callback func = NULL);
+	void run();
+	void cleanup();
+    
+private:
+	void lockThread();
+	void unlockThread();
+
+	typedef std::set<LLWatchdogEntry*> SuspectsRegistry;
+	SuspectsRegistry mSuspects;
+	LLMutex* mSuspectsAccessMutex;
+	LLWatchdogTimerThread* mTimer;
+	U64 mLastClockCount;
+
+	killer_event_callback mKillerCallback;
+};
+
+#endif // LL_LLTHREADWATCHDOG_H