llwatchdog.h

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#ifndef LL_LLTHREADWATCHDOG_H
#define LL_LLTHREADWATCHDOG_H

#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 start();
        virtual void stop();
};

class LLWatchdogTimeout : public LLWatchdogEntry
{
public:
        LLWatchdogTimeout();
        virtual ~LLWatchdogTimeout();

        /* virtual */ bool isAlive() const;
        /* virtual */ void start(); 
        /* virtual */ void stop();

        void setTimeout(F32 d);
        void ping();

private:
        LLTimer mTimer;
        F32 mTimeout;
};

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);

        void init();
        void run();
        void cleanup();
    
private:
        typedef std::set<LLWatchdogEntry*> SuspectsRegistry;
        SuspectsRegistry mSuspects;
        LLMutex* mSuspectsAccessMutex;
        LLWatchdogTimerThread* mTimer;
};

#endif // LL_LLTHREADWATCHDOG_H

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