common.cpp

Last Update: Jan 22 2009 可靠UDP传输, 一套高效的基于windows平台的C++ 开发库

/*****************************************************************************
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All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the
  above copyright notice, this list of conditions
  and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

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  nor the names of its contributors may be used to
  endorse or promote products derived from this
  software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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*****************************************************************************/

/*****************************************************************************
written by
   Yunhong Gu, last updated 12/05/2008
*****************************************************************************/


#ifndef WIN32
   #include <cstring>
   #include <cerrno>
#else
   #include <winsock2.h>
   #include <ws2tcpip.h>
   #include <wspiapi.h>
#endif
#include <cmath>
#include "md5.h"
#include "common.h"

uint64_t CTimer::s_ullCPUFrequency = CTimer::readCPUFrequency();
#ifndef WIN32
   pthread_mutex_t CTimer::m_EventLock = PTHREAD_MUTEX_INITIALIZER;
   pthread_cond_t CTimer::m_EventCond = PTHREAD_COND_INITIALIZER;
#else
   pthread_mutex_t CTimer::m_EventLock = CreateMutex(NULL, false, NULL);
   pthread_cond_t CTimer::m_EventCond = CreateEvent(NULL, false, false, NULL);
#endif

CTimer::CTimer()
{
   #ifndef WIN32
      pthread_mutex_init(&m_TickLock, NULL);
      pthread_cond_init(&m_TickCond, NULL);
   #else
      m_TickLock = CreateMutex(NULL, false, NULL);
      m_TickCond = CreateEvent(NULL, false, false, NULL);
   #endif
}

CTimer::~CTimer()
{
   #ifndef WIN32
      pthread_mutex_destroy(&m_TickLock);
      pthread_cond_destroy(&m_TickCond);
   #else
      CloseHandle(m_TickLock);
      CloseHandle(m_TickCond);
   #endif
}

void CTimer::rdtsc(uint64_t &x)
{
   #ifdef WIN32
      //HANDLE hCurThread = ::GetCurrentThread(); 
      //DWORD_PTR dwOldMask = ::SetThreadAffinityMask(hCurThread, 1); 
      BOOL ret = QueryPerformanceCounter((LARGE_INTEGER *)&x);
      //SetThreadAffinityMask(hCurThread, dwOldMask);

      if (!ret)
         x = getTime() * s_ullCPUFrequency;

   #elif IA32
      uint32_t lval, hval;
      //asm volatile ("push %eax; push %ebx; push %ecx; push %edx");
      //asm volatile ("xor %eax, %eax; cpuid");
      asm volatile ("rdtsc" : "=a" (lval), "=d" (hval));
      //asm volatile ("pop %edx; pop %ecx; pop %ebx; pop %eax");
      x = hval;
      x = (x << 32) | lval;
   #elif IA64
      asm ("mov %0=ar.itc" : "=r"(x) :: "memory");
   #elif AMD64
      uint32_t lval, hval;
      asm ("rdtsc" : "=a" (lval), "=d" (hval));
      x = hval;
      x = (x << 32) | lval;
   #else
      // use system call to read time clock for other archs
      timeval t;
      gettimeofday(&t, 0);
      x = (uint64_t)t.tv_sec * (uint64_t)1000000 + (uint64_t)t.tv_usec;
   #endif
}

uint64_t CTimer::readCPUFrequency()
{
   #ifdef WIN32
      int64_t ccf;
      if (QueryPerformanceFrequency((LARGE_INTEGER *)&ccf))
         return ccf / 1000000;
      else
         return 1;
   #elif IA32 || IA64 || AMD64
      uint64_t t1, t2;

      rdtsc(t1);
      timespec ts;
      ts.tv_sec = 0;
      ts.tv_nsec = 100000000;
      nanosleep(&ts, NULL);
      rdtsc(t2);

      // CPU clocks per microsecond
      return (t2 - t1) / 100000;
   #else
      return 1;
   #endif
}

uint64_t CTimer::getCPUFrequency()
{
   return s_ullCPUFrequency;
}

void CTimer::sleep(const uint64_t& interval)
{
   uint64_t t;
   rdtsc(t);

   // sleep next "interval" time
   sleepto(t + interval);
}

void CTimer::sleepto(const uint64_t& nexttime)
{
   // Use class member such that the method can be interrupted by others
   m_ullSchedTime = nexttime;

   uint64_t t;
   rdtsc(t);

   while (t < m_ullSchedTime)
   {
      #ifndef NO_BUSY_WAITING
         #ifdef IA32
            __asm__ volatile ("pause; rep; nop; nop; nop; nop; nop;");
         #elif IA64
            __asm__ volatile ("nop 0; nop 0; nop 0; nop 0; nop 0;");
         #elif AMD64
            __asm__ volatile ("nop; nop; nop; nop; nop;");
         #endif
      #else
         #ifndef WIN32
            timeval now;
            timespec timeout;
            gettimeofday(&now, 0);
            if (now.tv_usec < 990000)
            {
               timeout.tv_sec = now.tv_sec;
               timeout.tv_nsec = (now.tv_usec + 10000) * 1000;
            }
            else
            {
               timeout.tv_sec = now.tv_sec + 1;
               timeout.tv_nsec = (now.tv_usec + 10000 - 1000000) * 1000;
            }
            pthread_mutex_lock(&m_TickLock);
            pthread_cond_timedwait(&m_TickCond, &m_TickLock, &timeout);
            pthread_mutex_unlock(&m_TickLock);
         #else
            WaitForSingleObject(m_TickCond, 1);
         #endif
      #endif

      rdtsc(t);
   }
}

void CTimer::interrupt()
{
   // schedule the sleepto time to the current CCs, so that it will stop
   rdtsc(m_ullSchedTime);

   tick();
}

void CTimer::tick()
{
   #ifndef WIN32
      pthread_cond_signal(&m_TickCond);
   #else
      SetEvent(m_TickCond);
   #endif
}

uint64_t CTimer::getTime()
{
   #ifndef WIN32
      timeval t;
      gettimeofday(&t, 0);
      return t.tv_sec * 1000000ULL + t.tv_usec;
   #else
      LARGE_INTEGER ccf;
      HANDLE hCurThread = ::GetCurrentThread(); 
      DWORD_PTR dwOldMask = ::SetThreadAffinityMask(hCurThread, 1);
      if (QueryPerformanceFrequency(&ccf))
      {
         LARGE_INTEGER cc;
         if (QueryPerformanceCounter(&cc))
         {
            SetThreadAffinityMask(hCurThread, dwOldMask); 
            return (cc.QuadPart * 1000000ULL / ccf.QuadPart);
         }
      }

      SetThreadAffinityMask(hCurThread, dwOldMask); 
      return GetTickCount() * 1000ULL;
   #endif
}

void CTimer::triggerEvent()
{
   #ifndef WIN32
      pthread_cond_signal(&m_EventCond);
   #else
      SetEvent(m_EventCond);
   #endif
}

void CTimer::waitForEvent()
{
   #ifndef WIN32
      timeval now;
      timespec timeout;
      gettimeofday(&now, 0);
      if (now.tv_usec < 990000)
      {
         timeout.tv_sec = now.tv_sec;
         timeout.tv_nsec = (now.tv_usec + 10000) * 1000;
      }
      else
      {
         timeout.tv_sec = now.tv_sec + 1;
         timeout.tv_nsec = (now.tv_usec + 10000 - 1000000) * 1000;
      }
      pthread_mutex_lock(&m_EventLock);
      pthread_cond_timedwait(&m_EventCond, &m_EventLock, &timeout);
      pthread_mutex_unlock(&m_EventLock);
   #else
      WaitForSingleObject(m_EventCond, 1);
   #endif
}


//
// Automatically lock in constructor
CGuard::CGuard(pthread_mutex_t& lock):
m_Mutex(lock)
{
   #ifndef WIN32
      m_iLocked = pthread_mutex_lock(&m_Mutex);
   #else
      m_iLocked = WaitForSingleObject(m_Mutex, INFINITE);
   #endif
}

// Automatically unlock in destructor
CGuard::~CGuard()
{
   #ifndef WIN32
      if (0 == m_iLocked)
         pthread_mutex_unlock(&m_Mutex);
   #else
      if (WAIT_FAILED != m_iLocked)
         ReleaseMutex(m_Mutex);
   #endif
}

void CGuard::enterCS(pthread_mutex_t& lock)
{
   #ifndef WIN32
      pthread_mutex_lock(&lock);
   #else
      WaitForSingleObject(lock, INFINITE);
   #endif
}

void CGuard::leaveCS(pthread_mutex_t& lock)
{
   #ifndef WIN32
      pthread_mutex_unlock(&lock);
   #else
      ReleaseMutex(lock);
   #endif
}