/** * @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