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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
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