Time.hxx

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#if !defined(RESIP_TIME_HXX)
#define RESIP_TIME_HXX
 
#include "rutil/Mutex.hxx"
#include <limits.h>
#include "rutil/ResipAssert.h"
 
namespace resip
{
 
void sleepMs(unsigned int ms);
void sleepSeconds(unsigned int seconds);
 
class ResipClock
{
   public:
      ResipClock(void);
      ~ResipClock(void);
 
      static uint64_t getTimeMicroSec()
      {
         return getSystemTime();
      }
 
 
      static uint64_t getTimeMs()
      {
         return getSystemTime()/1000LL;
      }
 
      static uint64_t getTimeSecs()
      {
         return getSystemTime()/1000000LL;
      }
 
      static uint64_t getRandomFutureTimeMs( uint64_t futureMs );
      static uint64_t getForever();
 
      static unsigned getMaxSystemTimeWaitMs(void)
      {
         return mMaxSystemTimeWaitMs;
      }     
 
      static void queryTimerInfo(unsigned &minRes, unsigned &maxRes, unsigned &actualRes, bool &isMonotonic);
 
   private:
      static uint64_t getSystemTime();
 
      static unsigned mMaxSystemTimeWaitMs;
 
#ifdef WIN32
   private:
      class WinMonoClock
      {
         public:
            WinMonoClock();        
 
            static uint64_t GetClock64(void)
            {
               return mGTC64();
            }                     
 
         private:
 
            static void Initialize(void);
            typedef uint64_t (*PGTC64)(void);
 
            class GTCInterlocked
            {
               public:
 
                  static uint64_t GTC64(void);
 
                  static uint32_t GetMaxWaitMs(void)
                  {
                     //Since the base time isn't updated on every call, need to ensure that it's updated once every 49.7 days.
                     //The base time will lag behind the current tick count, which means the lag time must be used
                     //to determine the max wait.
                     //Also need to add a cushion to this calculaton because ::timeGetTime may not be accurate to 1ms.
                     __int64 maxWait = (__int64)UINT_MAX - mBaseTimeUpdateInterval - mBaseTimeCushion;
                     if (maxWait <= 0)
                     {
                        resip_assert(0);
                        const_cast<uint32_t &>(mBaseTimeUpdateInterval) = 60000;
                        const_cast<uint32_t &>(mBaseTimeCushion) = 120000;
                        return UINT_MAX - mBaseTimeUpdateInterval - mBaseTimeCushion;
                     }
                     return static_cast<uint32_t>(maxWait);
                  }
 
               private:
                  static _declspec(align(128)) volatile uint64_t mBaseTime;
                  static const uint32_t mBaseTimeUpdateInterval = 60000;
                  static const uint32_t mBaseTimeCushion = 120000; 
            };
 
            class GTCLockDuringRange
            {
               public:
 
                  static uint64_t GTC64(void);
 
                  static uint32_t GetMaxWaitMs(void)
                  {
                     return 120000;
                  }
 
               private:
                  static uint32_t mWrapCounter;
 
                  static DWORD mPrevTick;
 
                  static Mutex mWrapCounterMutex;
 
            };
 
            class GTCLock
            {
               public:
                  static uint64_t GTC64(void);
 
               private:
                  static ULARGE_INTEGER mBaseTime;
 
                  static Mutex mMutex;
            };
 
            static PGTC64 mGTC64;
      };
#endif
};
 
 
}//namespace resip
 
#endif
/* ====================================================================
 * The Vovida Software License, Version 1.0
 *
 * Copyright (c) 2000 Vovida Networks, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
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 *    distribution.
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 * 3. The names "VOCAL", "Vovida Open Communication Application Library",
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 * This software consists of voluntary contributions made by Vovida
 * Networks, Inc. and many individuals on behalf of Vovida Networks,
 * Inc.  For more information on Vovida Networks, Inc., please see
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 * vi: set shiftwidth=3 expandtab:
 */