[f7f1d77] | 1 | /** |
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| 2 | * @file |
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[82cb78d8] | 3 | * |
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[f7f1d77] | 4 | * @brief Remove Watchdog from List |
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| 5 | * @ingroup ScoreWatchdog |
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| 6 | */ |
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| 7 | |
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| 8 | /* |
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[08311cc3] | 9 | * COPYRIGHT (c) 1989-1999. |
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[82cb78d8] | 10 | * On-Line Applications Research Corporation (OAR). |
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| 11 | * |
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| 12 | * The license and distribution terms for this file may be |
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| 13 | * found in the file LICENSE in this distribution or at |
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[c499856] | 14 | * http://www.rtems.org/license/LICENSE. |
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[82cb78d8] | 15 | */ |
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| 16 | |
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[a8eed23] | 17 | #if HAVE_CONFIG_H |
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| 18 | #include "config.h" |
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| 19 | #endif |
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| 20 | |
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[4b48ece0] | 21 | #include <rtems/score/watchdogimpl.h> |
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[1ccbd052] | 22 | #include <rtems/score/assert.h> |
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| 23 | |
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[fd53d25] | 24 | static void _Watchdog_Remove_it( |
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[1ccbd052] | 25 | Watchdog_Header *header, |
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| 26 | Watchdog_Control *the_watchdog |
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| 27 | ) |
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| 28 | { |
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| 29 | Chain_Node *next; |
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| 30 | Watchdog_Interval delta; |
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| 31 | const Chain_Node *iterator_tail; |
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| 32 | Chain_Node *iterator_node; |
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| 33 | |
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[258d580c] | 34 | _Assert( the_watchdog->state == WATCHDOG_ACTIVE ); |
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[1ccbd052] | 35 | |
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| 36 | the_watchdog->state = WATCHDOG_INACTIVE; |
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| 37 | the_watchdog->stop_time = _Watchdog_Ticks_since_boot; |
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| 38 | |
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| 39 | next = _Chain_Next( &the_watchdog->Node ); |
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| 40 | delta = the_watchdog->delta_interval; |
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| 41 | |
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| 42 | if ( next != _Chain_Tail( &header->Watchdogs ) ) { |
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| 43 | Watchdog_Control *next_watchdog; |
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| 44 | |
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| 45 | next_watchdog = (Watchdog_Control *) next; |
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| 46 | next_watchdog->delta_interval += delta; |
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| 47 | } |
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| 48 | |
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| 49 | _Chain_Extract_unprotected( &the_watchdog->Node ); |
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| 50 | |
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| 51 | iterator_node = _Chain_First( &header->Iterators ); |
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| 52 | iterator_tail = _Chain_Immutable_tail( &header->Iterators ); |
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| 53 | |
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| 54 | while ( iterator_node != iterator_tail ) { |
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| 55 | Watchdog_Iterator *iterator; |
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| 56 | |
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| 57 | iterator = (Watchdog_Iterator *) iterator_node; |
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| 58 | |
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| 59 | if ( iterator->current == next ) { |
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| 60 | iterator->delta_interval += delta; |
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| 61 | } |
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| 62 | |
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| 63 | if ( iterator->current == &the_watchdog->Node ) { |
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[a48b7c44] | 64 | Chain_Node *previous = _Chain_Previous( &the_watchdog->Node ); |
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| 65 | |
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| 66 | iterator->current = previous; |
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| 67 | |
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| 68 | if ( previous != _Chain_Head( &header->Watchdogs ) ) { |
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| 69 | Watchdog_Control *previous_watchdog; |
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| 70 | |
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| 71 | previous_watchdog = (Watchdog_Control *) previous; |
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| 72 | iterator->delta_interval += previous_watchdog->delta_interval; |
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| 73 | } |
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[1ccbd052] | 74 | } |
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| 75 | |
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| 76 | iterator_node = _Chain_Next( iterator_node ); |
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| 77 | } |
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| 78 | } |
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[82cb78d8] | 79 | |
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| 80 | Watchdog_States _Watchdog_Remove( |
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[2903090] | 81 | Watchdog_Header *header, |
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[82cb78d8] | 82 | Watchdog_Control *the_watchdog |
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| 83 | ) |
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| 84 | { |
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[6d253941] | 85 | ISR_lock_Context lock_context; |
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[82cb78d8] | 86 | Watchdog_States previous_state; |
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[1ccbd052] | 87 | Watchdog_Interval now; |
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[82cb78d8] | 88 | |
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[6d253941] | 89 | _Watchdog_Acquire( header, &lock_context ); |
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[82cb78d8] | 90 | previous_state = the_watchdog->state; |
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| 91 | switch ( previous_state ) { |
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| 92 | case WATCHDOG_INACTIVE: |
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| 93 | break; |
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| 94 | |
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[a0ed4ed] | 95 | case WATCHDOG_BEING_INSERTED: |
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[05279b84] | 96 | |
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[82cb78d8] | 97 | /* |
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| 98 | * It is not actually on the chain so just change the state and |
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| 99 | * the Insert operation we interrupted will be aborted. |
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| 100 | */ |
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| 101 | the_watchdog->state = WATCHDOG_INACTIVE; |
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[1ccbd052] | 102 | now = _Watchdog_Ticks_since_boot; |
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| 103 | the_watchdog->start_time = now; |
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| 104 | the_watchdog->stop_time = now; |
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[82cb78d8] | 105 | break; |
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| 106 | |
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| 107 | case WATCHDOG_ACTIVE: |
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[1ccbd052] | 108 | _Watchdog_Remove_it( header, the_watchdog ); |
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[82cb78d8] | 109 | break; |
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| 110 | } |
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| 111 | |
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[6d253941] | 112 | _Watchdog_Release( header, &lock_context ); |
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[82cb78d8] | 113 | return( previous_state ); |
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| 114 | } |
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[fd53d25] | 115 | |
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| 116 | void _Watchdog_Tickle( |
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| 117 | Watchdog_Header *header |
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| 118 | ) |
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| 119 | { |
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| 120 | ISR_lock_Context lock_context; |
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| 121 | |
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| 122 | _Watchdog_Acquire( header, &lock_context ); |
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| 123 | |
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| 124 | if ( !_Watchdog_Is_empty( header ) ) { |
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| 125 | Watchdog_Control *first; |
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| 126 | Watchdog_Interval delta; |
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| 127 | |
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| 128 | first = _Watchdog_First( header ); |
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| 129 | delta = first->delta_interval; |
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| 130 | |
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| 131 | /* |
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| 132 | * Although it is forbidden to insert watchdogs with a delta interval of |
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| 133 | * zero it is possible to observe watchdogs with a delta interval of zero |
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| 134 | * at this point. For example lets have a watchdog chain of one watchdog |
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| 135 | * with a delta interval of one and insert a new one with an initial value |
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| 136 | * of one. At the start of the insert procedure it will advance one step |
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| 137 | * and reduce its delta interval by one yielding zero. Now a tick happens. |
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| 138 | * This will remove the watchdog on the chain and update the insert |
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| 139 | * iterator. Now the insert operation continues and will insert the new |
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| 140 | * watchdog with a delta interval of zero. |
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| 141 | */ |
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| 142 | if ( delta > 0 ) { |
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| 143 | --delta; |
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| 144 | first->delta_interval = delta; |
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| 145 | } |
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| 146 | |
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| 147 | while ( delta == 0 ) { |
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| 148 | bool run; |
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| 149 | Watchdog_Service_routine_entry routine; |
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| 150 | Objects_Id id; |
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| 151 | void *user_data; |
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| 152 | |
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| 153 | run = ( first->state == WATCHDOG_ACTIVE ); |
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| 154 | |
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| 155 | _Watchdog_Remove_it( header, first ); |
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| 156 | |
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| 157 | routine = first->routine; |
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| 158 | id = first->id; |
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| 159 | user_data = first->user_data; |
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| 160 | |
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| 161 | _Watchdog_Release( header, &lock_context ); |
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| 162 | |
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| 163 | if ( run ) { |
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| 164 | (*routine)( id, user_data ); |
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| 165 | } |
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| 166 | |
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| 167 | _Watchdog_Acquire( header, &lock_context ); |
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| 168 | |
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| 169 | if ( _Watchdog_Is_empty( header ) ) { |
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| 170 | break; |
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| 171 | } |
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| 172 | |
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| 173 | first = _Watchdog_First( header ); |
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| 174 | delta = first->delta_interval; |
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| 175 | } |
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| 176 | } |
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| 177 | |
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| 178 | _Watchdog_Release( header, &lock_context ); |
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| 179 | } |
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