source: rtems/cpukit/score/src/coretodabsolutetimeout.c @ 2256946

Last change on this file since 2256946 was 2256946, checked in by Sebastian Huber <sebastian.huber@…>, on Oct 6, 2017 at 1:30:47 PM

score: Use struct timespec for TOD

Use the timestamps only for uptime based values. Use struct timespec
for the absolute time values (TOD).

Update #2740.

  • Property mode set to 100644
File size: 1.8 KB
Line 
1/**
2 * @file
3 *
4 * @brief Convert Absolute Timeout to Ticks
5 * @ingroup ScoreTOD
6 */
7
8/*
9 *  COPYRIGHT (c) 1989-2008.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.rtems.org/license/LICENSE.
15 */
16
17#if HAVE_CONFIG_H
18#include "config.h"
19#endif
20
21#include <rtems/score/todimpl.h>
22
23/*
24 *  The abstime is a walltime.  We turn it into an interval.
25 */
26TOD_Absolute_timeout_conversion_results _TOD_Absolute_timeout_to_ticks(
27  const struct timespec *abstime,
28  clockid_t              clock,
29  Watchdog_Interval     *ticks_out
30)
31{
32  struct timespec current_time;
33  struct timespec difference;
34
35  /*
36   *  Make sure there is always a value returned.
37   */
38  *ticks_out = 0;
39
40  /*
41   *  Is the absolute time even valid?
42   */
43  if ( !_Timespec_Is_valid(abstime) )
44    return TOD_ABSOLUTE_TIMEOUT_INVALID;
45
46  /*
47   *  Is the absolute time in the past?
48   */
49  if ( clock == CLOCK_REALTIME ) {
50    _TOD_Get( &current_time );
51  } else {
52    _Assert( clock == CLOCK_MONOTONIC );
53    _TOD_Get_zero_based_uptime_as_timespec( &current_time );
54  }
55
56  if ( _Timespec_Less_than( abstime, &current_time ) )
57    return TOD_ABSOLUTE_TIMEOUT_IS_IN_PAST;
58
59  /*
60   *  How long until the requested absolute time?
61   */
62  _Timespec_Subtract( &current_time, abstime, &difference );
63
64  /*
65   *  Internally the SuperCore uses ticks, so convert to them.
66   */
67  *ticks_out = _Timespec_To_ticks( &difference );
68
69  /*
70   *  If the difference was 0, then the future is now.  It is so bright
71   *  we better wear shades.
72   */
73  if ( !*ticks_out )
74    return TOD_ABSOLUTE_TIMEOUT_IS_NOW;
75
76  /*
77   *  This is the case we were expecting and it took this long to
78   *  get here.
79   */
80  return TOD_ABSOLUTE_TIMEOUT_IS_IN_FUTURE;
81}
82
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