source: rtems/c/src/exec/score/src/watchdoginsert.c @ df49c60

4.104.114.84.95
Last change on this file since df49c60 was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on 11/17/99 at 17:51:34

Updated copyright notice.

  • Property mode set to 100644
File size: 2.3 KB
Line 
1/*
2 *  Watchdog Handler
3 *
4 *
5 *  COPYRIGHT (c) 1989-1999.
6 *  On-Line Applications Research Corporation (OAR).
7 *
8 *  The license and distribution terms for this file may be
9 *  found in the file LICENSE in this distribution or at
10 *  http://www.OARcorp.com/rtems/license.html.
11 *
12 *  $Id$
13 */
14
15#include <rtems/system.h>
16#include <rtems/score/isr.h>
17#include <rtems/score/watchdog.h>
18
19/*PAGE
20 *
21 *  _Watchdog_Insert
22 *
23 *  This routine inserts a watchdog timer on to the appropriate delta
24 *  chain while updating the delta interval counters.
25 */
26
27void _Watchdog_Insert(
28  Chain_Control         *header,
29  Watchdog_Control      *the_watchdog
30)
31{
32  ISR_Level          level;
33  Watchdog_Control  *after;
34  unsigned32         insert_isr_nest_level;
35  Watchdog_Interval  delta_interval;
36 
37
38  insert_isr_nest_level   = _ISR_Nest_level;
39  the_watchdog->state = WATCHDOG_BEING_INSERTED;
40
41  _Watchdog_Sync_count++;
42restart:
43  delta_interval = the_watchdog->initial;
44
45  _ISR_Disable( level );
46
47  for ( after = _Watchdog_First( header ) ;
48        ;
49        after = _Watchdog_Next( after ) ) {
50
51     if ( delta_interval == 0 || !_Watchdog_Next( after ) )
52       break;
53
54     if ( delta_interval < after->delta_interval ) {
55       after->delta_interval -= delta_interval;
56       break;
57     }
58
59     delta_interval -= after->delta_interval;
60
61     /*
62      *  If you experience problems comment out the _ISR_Flash line. 
63      *  3.2.0 was the first release with this critical section redesigned.
64      *  Under certain circumstances, the PREVIOUS critical section algorithm
65      *  used around this flash point allowed interrupts to execute
66      *  which violated the design assumptions.  The critical section
67      *  mechanism used here WAS redesigned to address this.
68      */
69
70     _ISR_Flash( level );
71
72     if ( the_watchdog->state != WATCHDOG_BEING_INSERTED ) {
73       goto exit_insert;
74     }
75
76     if ( _Watchdog_Sync_level > insert_isr_nest_level ) {
77       _Watchdog_Sync_level = insert_isr_nest_level;
78       _ISR_Enable( level );
79       goto restart;
80     }
81  }
82
83  _Watchdog_Activate( the_watchdog );
84
85  the_watchdog->delta_interval = delta_interval;
86
87  _Chain_Insert_unprotected( after->Node.previous, &the_watchdog->Node );
88
89  the_watchdog->start_time = _Watchdog_Ticks_since_boot;
90
91exit_insert:
92  _Watchdog_Sync_level = insert_isr_nest_level;
93  _Watchdog_Sync_count--;
94  _ISR_Enable( level );
95}
96
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