/*! ========================================================================
** Extended Template and Library
** Clock Abstraction 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_H
#define __ETL__CLOCK_H
/* === H E A D E R S ======================================================= */
#ifndef _WIN32
#include <unistd.h>
#else
inline void sleep(int i) { Sleep(i*1000); }
#endif
/* === 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 {
inline void yield() { sleep(0); }
/*! ========================================================================
** \class clock_base
** \brief clock abstraction
**
** A more detailed description needs to be written.
*/
template <class DESC>
class clock_base : public DESC
{
public:
typedef typename DESC::value_type value_type;
private:
typedef clock_base<DESC> _clock;
typedef typename DESC::timestamp timestamp;
timestamp base_time;
using DESC::get_current_time;
using DESC::realtime;
using DESC::one_second;
public:
clock_base() { reset(); }
void reset()
{ get_current_time(base_time); }
value_type operator()()const
{ return this->timestamp_to_seconds(get_current_time()-base_time); }
value_type pop_time()
{
// Grab the old base time
timestamp old_time=base_time;
// Put the current time into base_time
get_current_time(base_time);
return this->timestamp_to_seconds(base_time-old_time);
}
static void
sleep(const value_type &length)
{
if(!realtime())
::sleep((int)(length+0.5));
else
{
_clock timer;
timer.reset();
value_type val;
for(val=timer();one_second()<length-val;val=timer())
::sleep((int)((length-val)/2.0+0.4));
while(timer()<length)
;
}
/* This is a different waiting mechanism that uses
** the native timestamp type of the clock rather
** than converting it to a double (or whatever).
** You would think that this would be at least a
** few microseconds faster, but a few tests on my
** PowerBook G4 have proved otherwise. Indeed I loose
** several microseconds using this "optimized" method.
** Bizarre.
** - darco (8-17-2002)
{
timestamp endtime=get_current_time()+seconds_to_timestamp(length);
timestamp loopendtime=get_current_time()+seconds_to_timestamp(length-1.0);
while(get_current_time()<loopendtime)
::sleep((int)timestamp_to_seconds(loopendtime-get_current_time())/2.0);
while(get_current_time()<endtime);
}
*/
return;
}
};
};
/* === E N D =============================================================== */
#endif