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/**
* @file llthreadwatchdog.h
* @brief The LLThreadWatchdog class declaration
*
* $LicenseInfo:firstyear=2007&license=viewergpl$
*
* 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.
* $/LicenseInfo$
*/
#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(const std::string& state);
/* virtual */ void stop();
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
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