1/* Implement timing-related runtime actions for CHILL.
2   Copyright (C) 1992,1993 Free Software Foundation, Inc.
3   Author: Wilfried Moser
4
5   This file is part of GNU CC.
6
7   GNU CC is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 2, or (at your option)
10   any later version.
11
12   GNU CC is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with GNU CC; see the file COPYING.  If not, write to
19   the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA.  */
21
22/* As a special exception, if you link this library with other files,
23   some of which are compiled with GCC, to produce an executable,
24   this library does not by itself cause the resulting executable
25   to be covered by the GNU General Public License.
26   This exception does not however invalidate any other reasons why
27   the executable file might be covered by the GNU General Public License.  */
28
29#include "rts.h"
30
31/*
32 * function __remaintime
33 *
34 * parameters:
35 *      since   pointer to the  initial RtsTime
36 *      dur     the duration value
37 *      t       pointer to the remaining RtsTime
38 *
39 * returns:
40 *      int     0 .. there is a remaining time
41 *              1 .. there is no remaining time
42 *
43 * exceptions:
44 *      none
45 *
46 * abstract:
47 *      This function writes to t the remaining duration value in RtsTime format
48 *      from a given start (since) and the current RtsTime.
49 *
50 */
51
52extern void __convert_duration_rtstime (unsigned long dur, RtsTime *t);
53
54int
55  __remaintime (since, dur, t)
56RtsTime       *since;
57unsigned long  dur;
58RtsTime       *t;
59{
60  RtsTime now, dur_in_rtstime, tmp, diff;
61
62  __rtstime (&now);
63  __convert_duration_rtstime (dur, &dur_in_rtstime);
64
65  tmp.secs = since->secs;
66  tmp.nanosecs = since->nanosecs;
67
68  /* calculate the difference of absolute times */
69  if (tmp.nanosecs > now.nanosecs)
70    {
71      tmp.secs--;
72      tmp.nanosecs += 1000000000;
73    }
74  diff.secs = now.secs - tmp.secs;
75  diff.nanosecs = now.nanosecs - tmp.nanosecs;
76
77  /* substract diff from duration */
78  if (diff.nanosecs > dur_in_rtstime.nanosecs)
79    {
80      dur_in_rtstime.secs--;
81      dur_in_rtstime.nanosecs += 1000000000;
82    }
83
84  t->secs = dur_in_rtstime.secs - diff.secs;
85  t->nanosecs = dur_in_rtstime.nanosecs - diff.nanosecs;
86
87  if (t->secs > dur_in_rtstime.secs)
88    return 1;
89  else
90    return 0;
91}
92