/*! ========================================================================
** Extended Template and Library
** gettimeofday() Clock Description Implementation
** $Id$
**
** Copyright (c) 2002 Robert B. Quattlebaum Jr.
**
** This package 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; either version 2 of
** the License, or (at your option) any later version.
**
** This package 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.
**
** === N O T E S ===========================================================
**
** This is an internal header file, included by other ETL headers.
** You should not attempt to use it directly.
**
** ========================================================================= */
/* === S T A R T =========================================================== */
#ifndef __ETL__CLOCK_GETTIMEOFDAY_H
#define __ETL__CLOCK_GETTIMEOFDAY_H
/* === H E A D E R S ======================================================= */
#include <sys/time.h>
#include <cmath>
/* === M A C R O S ========================================================= */
/* === T Y P E D E F S ===================================================== */
/* === C L A S S E S & S T R U C T S ======================================= */
namespace etl {
class clock_desc_gettimeofday
{
public:
typedef double value_type;
inline static bool realtime()
{ return true; }
inline static bool proctime()
{ return false; }
inline static value_type
one_second()
{ return 1.0f; }
inline static value_type precision()
{ return one_second()/(value_type)1000000.0f; }
inline static const char *description()
{ return "UNIX gettimeofday()"; };
protected:
class timestamp : public timeval
{
timestamp(int sec, int usec)
{ tv_sec=sec; tv_usec=usec; }
friend class clock_desc_gettimeofday;
public:
timestamp() { }
inline timestamp operator-(const timestamp &rhs)const
{
timestamp ret;
ret.tv_usec=tv_usec-rhs.tv_usec;
if(ret.tv_usec<0)
{
ret.tv_sec=tv_sec-rhs.tv_sec-1;
ret.tv_usec+=1000000;
}
else
ret.tv_sec=tv_sec-rhs.tv_sec;
return ret;
}
inline timestamp operator+(timestamp rhs)const
{
rhs.tv_usec+=tv_usec;
if(rhs.tv_usec>1000000)
{
rhs.tv_sec+=tv_sec+1;
rhs.tv_usec-=1000000;
}
else
rhs.tv_sec+=tv_sec;
return rhs;
}
inline bool operator<(const timestamp &rhs)const
{ return tv_sec<rhs.tv_sec || tv_usec<rhs.tv_usec; }
inline bool operator==(const timestamp &rhs)const
{ return tv_usec==rhs.tv_usec && tv_sec==rhs.tv_sec; }
inline bool operator!=(const timestamp &rhs)const
{ return tv_usec!=rhs.tv_usec || tv_sec!=rhs.tv_sec; }
};
static void
get_current_time(timestamp &x)
{ gettimeofday(&x,NULL);}
static timestamp
get_current_time()
{ timestamp ret; get_current_time(ret); return ret; }
static value_type
timestamp_to_seconds(const timestamp &x)
{ return (value_type)x.tv_sec + precision()*x.tv_usec; }
static timestamp
seconds_to_timestamp(const value_type &x)
{ return timestamp((int)floor(x), (int)((x-floor(x))/precision()+0.5)); }
};
};
/* === E N D =============================================================== */
#endif