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diff --git a/linden/indra/newview/llwatchdog.cpp b/linden/indra/newview/llwatchdog.cpp
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+++ b/linden/indra/newview/llwatchdog.cpp
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+/** 
+ * @file llthreadwatchdog.cpp
+ * @brief The LLThreadWatchdog class definitions
+ *
+ * $LicenseInfo:firstyear=2007&license=viewergpl$
+ * 
+ * Copyright (c) 2007-2008, 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.
+ * $/LicenseInfo$
+ */
+
+
+#include "llviewerprecompiledheaders.h"
+#include "llwatchdog.h"
+
+// This class runs the watchdog timing thread.
+class LLWatchdogTimerThread : public LLThread
+{
+public:
+        LLWatchdogTimerThread() : 
+                LLThread("Watchdog"),
+                mSleepMsecs(0),
+                mStopping(false)
+        {
+        }
+            
+        ~LLWatchdogTimerThread() {}
+    
+        void setSleepTime(long ms) { mSleepMsecs = ms; }
+        void stop() 
+        {
+                mStopping = true; 
+                ms_sleep(1);
+        }
+    
+        /* virtual */ void run()
+        {
+                while(!mStopping)
+                {
+                        LLWatchdog::getInstance()->run();
+                        ms_sleep(mSleepMsecs);
+                }
+        }
+
+private:
+        long mSleepMsecs;
+        bool mStopping;
+};
+
+// LLWatchdogEntry
+LLWatchdogEntry::LLWatchdogEntry()
+{
+}
+
+LLWatchdogEntry::~LLWatchdogEntry()
+{
+}
+
+void LLWatchdogEntry::start()
+{
+        LLWatchdog::getInstance()->add(this);
+}
+
+void LLWatchdogEntry::stop()
+{
+        LLWatchdog::getInstance()->remove(this);
+}
+
+// LLWatchdogTimeout
+LLWatchdogTimeout::LLWatchdogTimeout() : 
+        mTimeout(0.0f) 
+{
+}
+
+LLWatchdogTimeout::~LLWatchdogTimeout() 
+{
+}
+
+bool LLWatchdogTimeout::isAlive() const 
+{ 
+        return (mTimer.getStarted() && !mTimer.hasExpired()); 
+}
+
+void LLWatchdogTimeout::setTimeout(F32 d) 
+{
+        mTimeout = d;
+}
+
+void LLWatchdogTimeout::start() 
+{
+        // Order of operation is very impmortant here.
+        // After LLWatchdogEntry::start() is called
+        // LLWatchdogTimeout::isAlive() will be called asynchronously. 
+        mTimer.start(); 
+        mTimer.setTimerExpirySec(mTimeout); 
+        LLWatchdogEntry::start();
+}
+void LLWatchdogTimeout::stop() 
+{
+        LLWatchdogEntry::stop();
+        mTimer.stop();
+}
+
+void LLWatchdogTimeout::ping() 
+{ 
+        mTimer.setTimerExpirySec(mTimeout); 
+}
+
+// LlWatchdog
+LLWatchdog::LLWatchdog() :
+        mSuspectsAccessMutex(NULL),
+        mTimer(NULL)
+{
+}
+
+LLWatchdog::~LLWatchdog()
+{
+}
+
+void LLWatchdog::add(LLWatchdogEntry* e)
+{
+        lockThread();
+        mSuspects.insert(e);
+        unlockThread();
+}
+
+void LLWatchdog::remove(LLWatchdogEntry* e)
+{
+        lockThread();
+    mSuspects.erase(e);
+        unlockThread();
+}
+
+void LLWatchdog::init()
+{
+        if(!mSuspectsAccessMutex && !mTimer)
+        {
+                mSuspectsAccessMutex = new LLMutex(NULL);
+                mTimer = new LLWatchdogTimerThread();
+                mTimer->setSleepTime(1000);
+                mTimer->start();
+        }
+}
+
+void LLWatchdog::cleanup()
+{
+        if(mTimer)
+        {
+                mTimer->stop();
+                delete mTimer;
+        }
+
+        if(mSuspectsAccessMutex)
+        {
+                delete mSuspectsAccessMutex;
+        }
+}
+
+void LLWatchdog::run()
+{
+        lockThread();
+        
+        SuspectsRegistry::iterator result = 
+                std::find_if(mSuspects.begin(), 
+                        mSuspects.end(), 
+                        std::not1(std::mem_fun(&LLWatchdogEntry::isAlive))
+                        );
+
+        if(result != mSuspects.end())
+        {
+                // error!!!
+                if(mTimer)
+                {
+                        mTimer->stop();
+                }
+
+                llinfos << "Watchdog detected error:" << llendl;
+#ifdef LL_WINDOWS
+                RaiseException(0,0,0,0);
+#else
+                raise(SIGQUIT);
+#endif
+        }
+
+        unlockThread();
+}
+
+void LLWatchdog::lockThread()
+{
+        if(mSuspectsAccessMutex != NULL)
+        {
+                mSuspectsAccessMutex->lock();
+        }
+}
+
+void LLWatchdog::unlockThread()
+{
+        if(mSuspectsAccessMutex != NULL)
+        {
+                mSuspectsAccessMutex->unlock();
+        }
+}