timer.cpp

这个文件是windows mysql源码

/*
   Copyright (C) 2000-2007 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; see the file COPYING. If not, write to the
   Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
   MA  02110-1301  USA.
*/

/* timer.cpp implements a high res and low res timer
 *
*/

#include "runtime.hpp"
#include "timer.hpp"

#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
#include <sys/time.h>
#endif

namespace yaSSL {

#ifdef _WIN32

    timer_d timer()
    {
        static bool          init(false);
        static LARGE_INTEGER freq;
    
        if (!init) {
            QueryPerformanceFrequency(&freq);
            init = true;
        }

        LARGE_INTEGER count;
        QueryPerformanceCounter(&count);

        return static_cast<double>(count.QuadPart) / freq.QuadPart;
    }


    uint lowResTimer()
    {
        return static_cast<uint>(timer());
    }

#else // _WIN32

    timer_d timer()
    {
        struct timeval tv;
        gettimeofday(&tv, 0);

        return static_cast<double>(tv.tv_sec) 
             + static_cast<double>(tv.tv_usec) / 1000000;
    }


    uint lowResTimer()
    {
        struct timeval tv;
        gettimeofday(&tv, 0);

        return tv.tv_sec; 
    }


#endif // _WIN32
} // namespace yaSSL