/* Implement timing-related runtime actions for CHILL.
   Copyright (C) 1992,1993 Free Software Foundation, Inc.
   Author: Wilfried Moser

This file is part of GNU CC.

GNU CC 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, or (at your option)
any later version.

GNU CC 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 GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "rtltypes.h"
#include "rts.h"

EXCEPTION (timerfail);

/*
 * function __wait_until
 *
 * parameters:
 *     abstime   absolute time value
 *     filename
 *     linenumber
 *
 * returns:
 *     int   0 on success, 1 on failure
 *
 * exceptions:
 *     timerfail
 *
 * abstract:
 *     check for given argument is valid, calculate how long to wait in
 *     seconds and call os to do it.
 *
 */

int
__wait_until (abstime, filename, linenumber)
     unsigned long  abstime;
     char          *filename;
     int            linenumber;
{
  RtsTime	now, delta, abs_rtstime;
    
  /* get current time */
  __rtstime (&now);
    
  abs_rtstime.secs = abstime;
  abs_rtstime.nanosecs = 0;
  
  if (abs_rtstime.nanosecs < now.nanosecs)
    {
      abs_rtstime.secs--;
      abs_rtstime.nanosecs += 1000000000;
    }
  
  delta.secs = abs_rtstime.secs - now.secs;
  delta.nanosecs = abs_rtstime.nanosecs - now.nanosecs;
  
  if (delta.secs > abs_rtstime.secs)
    /* cannot wait into past */
    return 1;
  
  return __delay_this (wait_wait, &delta, filename, linenumber) == 1 ? 0 : 1;
}