timerutil.h

#ifndef __MALLIE__TIMERUTIL_H__
#define __MALLIE__TIMERUTIL_H__

// This class is NOT thread-safe timer!

#ifdef _WIN32
#ifdef __cplusplus
extern "C" {
#endif
#include <windows.h>
#include <mmsystem.h>
#ifdef __cplusplus
}
#endif
#pragma comment(lib, "winmm.lib")
#else
#if defined(__unix__) || defined(__APPLE__)
#include <sys/time.h>
#else
#include <ctime>
#endif
#endif

namespace mallie {

class timerutil {
public:
#ifdef _WIN32
  typedef DWORD time_t;

  timerutil() { ::timeBeginPeriod(1); }
  ~timerutil() { ::timeEndPeriod(1); }

  void start() { t_[0] = ::timeGetTime(); }
  void end() { t_[1] = ::timeGetTime(); }

  time_t sec() { return (time_t)((t_[1] - t_[0]) / 1000); }
  time_t msec() { return (time_t)((t_[1] - t_[0])); }
  time_t usec() { return (time_t)((t_[1] - t_[0]) * 1000); }
  time_t current() { return ::timeGetTime(); }

#else
#if defined(__unix__) || defined(__APPLE__)
  typedef unsigned long int time_t;

  void start() { gettimeofday(tv + 0, &tz); }
  void end() { gettimeofday(tv + 1, &tz); }

  time_t sec() { return (time_t)(tv[1].tv_sec - tv[0].tv_sec); }
  time_t msec() {
    return this->sec() * 1000 +
           (time_t)((tv[1].tv_usec - tv[0].tv_usec) / 1000);
  }
  time_t usec() {
    return this->sec() * 1000000 + (time_t)(tv[1].tv_usec - tv[0].tv_usec);
  }
  time_t current() {
    struct timeval t;
    gettimeofday(&t, NULL);
    return (time_t)(t.tv_sec * 1000 + t.tv_usec);
  }

#else // C timer
  // using namespace std;
  typedef clock_t time_t;

  void start() { t_[0] = clock(); }
  void end() { t_[1] = clock(); }

  time_t sec() { return (time_t)((t_[1] - t_[0]) / CLOCKS_PER_SEC); }
  time_t msec() { return (time_t)((t_[1] - t_[0]) * 1000 / CLOCKS_PER_SEC); }
  time_t usec() { return (time_t)((t_[1] - t_[0]) * 1000000 / CLOCKS_PER_SEC); }
  time_t current() { return (time_t)clock(); }

#endif
#endif

private:
#ifdef _WIN32
  DWORD t_[2];
#else
#if defined(__unix__) || defined(__APPLE__)
  struct timeval tv[2];
  struct timezone tz;
#else
  time_t t_[2];
#endif
#endif
};
}

#endif