/*

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!                                                                   !!
!!                   GNU General Public License                      !!
!!                                                                   !!
!! This file is part of the Flexible Modeling System (FMS).          !!
!!                                                                   !!
!! FMS is free software; you can redistribute it and/or modify       !!
!! it and are expected to follow the terms of the GNU General Public !!
!! License as published by the Free Software Foundation.             !!
!!                                                                   !!
!! FMS 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 FMS; if not, write to:                                 !!
!!          Free Software Foundation, Inc.                           !!
!!          59 Temple Place, Suite 330                               !!
!!          Boston, MA  02111-1307  USA                              !!
!! or see:                                                           !!
!!          http://www.gnu.org/licenses/gpl.txt                      !!
!!                                                                   !!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

*/
#include <stdio.h>
#include <time.h>
#ifndef __aix
#ifdef __sgi
long delta_t=0;			// clock resolution in nanoseconds

long sgi_ticks_per_sec_() {	// returns inverse clock resolution (1/sec)
  struct timespec t;
  clock_getres( CLOCK_SGI_CYCLE, &t );
  delta_t = (long)t.tv_sec*1000000000 + (long)t.tv_nsec;
  return 1000000000/delta_t;
}

long sgi_tick_() {		// returns current time in units of delta_t
  struct timespec t;
  if( delta_t==0 ) (void) sgi_ticks_per_sec_(); // initialize delta_t if needed
  clock_gettime( CLOCK_SGI_CYCLE, &t );
  return ( (long)t.tv_sec*1000000000+(long)t.tv_nsec )/delta_t;
}

long sgi_max_tick_() {		// clock rollover point is 2^max_tick
#include <sys/syssgi.h>
  return syssgi(SGI_CYCLECNTR_SIZE);
}
#endif

#ifdef test_nsclock
void main() {
#ifdef __sgi
  printf( "ticks per second=%li\n", sgi_ticks_per_sec_() );
  printf( "delta_t=%li\n", delta_t );
  printf( "max tick=%li\n", sgi_max_tick_() );
#else
  printf( "ticks per second=%i\n", CLOCKS_PER_SEC );
#endif
}
#endif
#endif