[f7f1d77] | 1 | /** |
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| 2 | * @file |
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[05df0a8] | 3 | * |
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[f7f1d77] | 4 | * @brief Restart Thread |
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| 5 | * @ingroup ScoreThread |
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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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[05df0a8] | 10 | * On-Line Applications Research Corporation (OAR). |
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| 11 | * |
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[1b1be254] | 12 | * Copyright (c) 2014 embedded brains GmbH. |
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| 13 | * |
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[05df0a8] | 14 | * The license and distribution terms for this file may be |
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[dcf3687] | 15 | * found in the file LICENSE in this distribution or at |
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[c499856] | 16 | * http://www.rtems.org/license/LICENSE. |
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[05df0a8] | 17 | */ |
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| 18 | |
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[a8eed23] | 19 | #if HAVE_CONFIG_H |
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| 20 | #include "config.h" |
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| 21 | #endif |
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| 22 | |
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[5618c37a] | 23 | #include <rtems/score/threadimpl.h> |
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[1b1be254] | 24 | #include <rtems/score/apimutex.h> |
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| 25 | #include <rtems/score/assert.h> |
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| 26 | #include <rtems/score/chainimpl.h> |
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| 27 | #include <rtems/score/isrlock.h> |
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| 28 | #include <rtems/score/schedulerimpl.h> |
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| 29 | #include <rtems/score/sysstate.h> |
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[dcd5e26] | 30 | #include <rtems/score/threadqimpl.h> |
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[3be0c9a] | 31 | #include <rtems/score/userextimpl.h> |
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[dcd5e26] | 32 | #include <rtems/score/watchdogimpl.h> |
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[1b1be254] | 33 | #include <rtems/score/wkspace.h> |
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| 34 | |
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| 35 | typedef struct { |
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| 36 | Chain_Control Chain; |
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| 37 | ISR_lock_Control Lock; |
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| 38 | } Thread_Zombie_control; |
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| 39 | |
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| 40 | static Thread_Zombie_control _Thread_Zombies = { |
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| 41 | .Chain = CHAIN_INITIALIZER_EMPTY( _Thread_Zombies.Chain ), |
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| 42 | .Lock = ISR_LOCK_INITIALIZER( "thread zombies" ) |
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| 43 | }; |
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| 44 | |
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| 45 | static void _Thread_Make_zombie( Thread_Control *the_thread ) |
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| 46 | { |
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| 47 | ISR_lock_Context lock_context; |
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| 48 | Thread_Zombie_control *zombies = &_Thread_Zombies; |
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| 49 | |
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[3f5f2ce] | 50 | if ( the_thread->resource_count != 0 ) { |
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| 51 | _Terminate( |
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| 52 | INTERNAL_ERROR_CORE, |
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| 53 | false, |
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| 54 | INTERNAL_ERROR_RESOURCE_IN_USE |
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| 55 | ); |
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| 56 | } |
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| 57 | |
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[1b1be254] | 58 | _Thread_Set_state( the_thread, STATES_ZOMBIE ); |
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| 59 | _Thread_queue_Extract_with_proxy( the_thread ); |
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| 60 | _Watchdog_Remove( &the_thread->Timer ); |
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| 61 | |
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| 62 | _ISR_lock_ISR_disable_and_acquire( &zombies->Lock, &lock_context ); |
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| 63 | _Chain_Append_unprotected( &zombies->Chain, &the_thread->Object.Node ); |
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| 64 | _ISR_lock_Release_and_ISR_enable( &zombies->Lock, &lock_context ); |
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| 65 | } |
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| 66 | |
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| 67 | static void _Thread_Free( Thread_Control *the_thread ) |
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| 68 | { |
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| 69 | _User_extensions_Thread_delete( the_thread ); |
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| 70 | |
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| 71 | /* |
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| 72 | * Free the per-thread scheduling information. |
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| 73 | */ |
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[24934e36] | 74 | _Scheduler_Free( _Scheduler_Get( the_thread ), the_thread ); |
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[1b1be254] | 75 | |
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| 76 | /* |
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| 77 | * The thread might have been FP. So deal with that. |
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| 78 | */ |
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| 79 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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| 80 | #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) |
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| 81 | if ( _Thread_Is_allocated_fp( the_thread ) ) |
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| 82 | _Thread_Deallocate_fp(); |
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| 83 | #endif |
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| 84 | |
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| 85 | _Workspace_Free( the_thread->Start.fp_context ); |
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| 86 | #endif |
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| 87 | |
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| 88 | /* |
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| 89 | * Free the rest of the memory associated with this task |
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| 90 | * and set the associated pointers to NULL for safety. |
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| 91 | */ |
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| 92 | _Thread_Stack_Free( the_thread ); |
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| 93 | |
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| 94 | _Workspace_Free( the_thread->extensions ); |
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| 95 | |
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| 96 | _Workspace_Free( the_thread->Start.tls_area ); |
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| 97 | |
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| 98 | _Objects_Free( |
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| 99 | _Objects_Get_information_id( the_thread->Object.id ), |
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| 100 | &the_thread->Object |
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| 101 | ); |
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| 102 | } |
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| 103 | |
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| 104 | static void _Thread_Wait_for_execution_stop( Thread_Control *the_thread ) |
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| 105 | { |
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| 106 | #if defined(RTEMS_SMP) |
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| 107 | /* |
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| 108 | * It is very unlikely that we see an executing thread here. It can happen |
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| 109 | * in case the thread termination sequence is interrupted by a slow interrupt |
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| 110 | * service on a remote processor. |
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| 111 | */ |
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| 112 | while (the_thread->is_executing) { |
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| 113 | /* Wait */ |
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| 114 | } |
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| 115 | #else |
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| 116 | (void) the_thread; |
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| 117 | #endif |
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| 118 | } |
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| 119 | |
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| 120 | void _Thread_Kill_zombies( void ) |
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| 121 | { |
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| 122 | ISR_lock_Context lock_context; |
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| 123 | Thread_Zombie_control *zombies = &_Thread_Zombies; |
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| 124 | Thread_Control *the_thread; |
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| 125 | |
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| 126 | _ISR_lock_ISR_disable_and_acquire( &zombies->Lock, &lock_context ); |
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| 127 | |
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| 128 | the_thread = (Thread_Control *) _Chain_Get_unprotected( &zombies->Chain ); |
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| 129 | while ( the_thread != NULL ) { |
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| 130 | _ISR_lock_Release_and_ISR_enable( &zombies->Lock, &lock_context ); |
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| 131 | |
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| 132 | _Thread_Wait_for_execution_stop( the_thread ); |
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| 133 | _Thread_Free( the_thread ); |
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| 134 | |
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| 135 | _ISR_lock_ISR_disable_and_acquire( &zombies->Lock, &lock_context ); |
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| 136 | |
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| 137 | the_thread = (Thread_Control *) _Chain_Get_unprotected( &zombies->Chain ); |
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| 138 | } |
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| 139 | |
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| 140 | _ISR_lock_Release_and_ISR_enable( &zombies->Lock, &lock_context ); |
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| 141 | } |
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| 142 | |
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| 143 | static void _Thread_Start_life_change_for_executing( |
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| 144 | Thread_Control *executing |
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| 145 | ) |
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| 146 | { |
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| 147 | _Assert( executing->Timer.state == WATCHDOG_INACTIVE ); |
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| 148 | _Assert( |
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| 149 | executing->current_state == STATES_READY |
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| 150 | || executing->current_state == STATES_SUSPENDED |
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| 151 | ); |
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| 152 | |
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| 153 | _Thread_Add_post_switch_action( executing, &executing->Life.Action ); |
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| 154 | } |
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[05df0a8] | 155 | |
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[5c731a83] | 156 | void _Thread_Life_action_handler( |
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| 157 | Thread_Control *executing, |
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| 158 | Thread_Action *action, |
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| 159 | Per_CPU_Control *cpu, |
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| 160 | ISR_Level level |
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| 161 | ) |
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| 162 | { |
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[1b1be254] | 163 | Thread_Life_state previous_life_state; |
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| 164 | |
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[5c731a83] | 165 | (void) action; |
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[1b1be254] | 166 | |
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| 167 | previous_life_state = executing->Life.state; |
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| 168 | executing->Life.state = THREAD_LIFE_PROTECTED; |
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| 169 | |
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[5c731a83] | 170 | _Thread_Action_release_and_ISR_enable( cpu, level ); |
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| 171 | |
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[1b1be254] | 172 | if ( _Thread_Is_life_terminating( previous_life_state ) ) { |
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| 173 | _User_extensions_Thread_terminate( executing ); |
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| 174 | } else { |
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| 175 | _Assert( _Thread_Is_life_restarting( previous_life_state ) ); |
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| 176 | |
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| 177 | _User_extensions_Thread_restart( executing ); |
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| 178 | } |
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[391ad3e] | 179 | |
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[5c731a83] | 180 | _Thread_Disable_dispatch(); |
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| 181 | |
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[1b1be254] | 182 | if ( _Thread_Is_life_terminating( previous_life_state ) ) { |
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| 183 | _Thread_Make_zombie( executing ); |
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| 184 | |
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| 185 | if ( executing->Life.terminator != NULL ) { |
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| 186 | _Thread_Clear_state( |
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| 187 | executing->Life.terminator, |
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| 188 | STATES_WAITING_FOR_TERMINATION |
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| 189 | ); |
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| 190 | } |
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| 191 | |
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| 192 | _Thread_Enable_dispatch(); |
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| 193 | |
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| 194 | _Assert_Not_reached(); |
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| 195 | } else { |
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| 196 | _Assert( _Thread_Is_life_restarting( previous_life_state ) ); |
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| 197 | |
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| 198 | if ( _Thread_Is_life_terminating( executing->Life.state ) ) { |
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| 199 | /* Someone deleted us in the mean-time */ |
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| 200 | _Thread_Start_life_change_for_executing( executing ); |
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| 201 | } else { |
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| 202 | _Assert( executing->Timer.state == WATCHDOG_INACTIVE ); |
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| 203 | _Assert( |
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| 204 | executing->current_state == STATES_READY |
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| 205 | || executing->current_state == STATES_SUSPENDED |
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| 206 | ); |
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| 207 | |
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| 208 | executing->Life.state = THREAD_LIFE_NORMAL; |
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| 209 | |
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| 210 | _Thread_Load_environment( executing ); |
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| 211 | _Thread_Restart_self( executing ); |
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| 212 | |
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| 213 | _Assert_Not_reached(); |
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| 214 | } |
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| 215 | } |
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[5c731a83] | 216 | } |
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| 217 | |
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[226c731] | 218 | static void _Thread_Start_life_change( |
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[e1598a6] | 219 | Thread_Control *the_thread, |
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| 220 | const Scheduler_Control *scheduler, |
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| 221 | Priority_Control priority |
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[226c731] | 222 | ) |
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[dcd5e26] | 223 | { |
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| 224 | the_thread->is_preemptible = the_thread->Start.is_preemptible; |
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| 225 | the_thread->budget_algorithm = the_thread->Start.budget_algorithm; |
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| 226 | the_thread->budget_callout = the_thread->Start.budget_callout; |
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[226c731] | 227 | the_thread->real_priority = priority; |
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[dcd5e26] | 228 | |
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[226c731] | 229 | _Thread_Set_transient( the_thread ); |
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| 230 | _Thread_queue_Extract_with_proxy( the_thread ); |
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| 231 | _Watchdog_Remove( &the_thread->Timer ); |
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[24934e36] | 232 | _Scheduler_Set_priority_if_higher( scheduler, the_thread, priority ); |
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[226c731] | 233 | _Thread_Add_post_switch_action( the_thread, &the_thread->Life.Action ); |
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| 234 | _Thread_Ready( the_thread ); |
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| 235 | _Thread_Request_dispatch_if_executing( the_thread ); |
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[dcd5e26] | 236 | } |
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| 237 | |
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[8690b53] | 238 | static void _Thread_Request_life_change( |
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[226c731] | 239 | Thread_Control *the_thread, |
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| 240 | Thread_Control *executing, |
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[1b1be254] | 241 | Priority_Control priority, |
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| 242 | Thread_Life_state additional_life_state |
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[8690b53] | 243 | ) |
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[05df0a8] | 244 | { |
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[1b1be254] | 245 | Thread_Life_state previous_life_state; |
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| 246 | Per_CPU_Control *cpu; |
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| 247 | ISR_Level level; |
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[e1598a6] | 248 | const Scheduler_Control *scheduler; |
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[1b1be254] | 249 | |
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| 250 | cpu = _Thread_Action_ISR_disable_and_acquire( the_thread, &level ); |
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| 251 | previous_life_state = the_thread->Life.state; |
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| 252 | the_thread->Life.state = previous_life_state | additional_life_state; |
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| 253 | _Thread_Action_release_and_ISR_enable( cpu, level ); |
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| 254 | |
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[24934e36] | 255 | scheduler = _Scheduler_Get( the_thread ); |
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[1b1be254] | 256 | if ( the_thread == executing ) { |
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| 257 | executing->real_priority = priority; |
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| 258 | |
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[24934e36] | 259 | _Scheduler_Set_priority_if_higher( scheduler, the_thread, priority ); |
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[1b1be254] | 260 | _Thread_Start_life_change_for_executing( executing ); |
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| 261 | } else if ( previous_life_state == THREAD_LIFE_NORMAL ) { |
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[24934e36] | 262 | _Thread_Start_life_change( the_thread, scheduler, priority ); |
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[1b1be254] | 263 | } else { |
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| 264 | _Thread_Clear_state( the_thread, STATES_SUSPENDED ); |
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| 265 | |
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| 266 | if ( _Thread_Is_life_terminating( additional_life_state ) ) { |
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| 267 | the_thread->real_priority = _Scheduler_Highest_priority_of_two( |
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[24934e36] | 268 | scheduler, |
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[1b1be254] | 269 | the_thread->real_priority, |
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| 270 | priority |
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| 271 | ); |
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| 272 | |
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[24934e36] | 273 | _Scheduler_Change_priority_if_higher( |
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| 274 | scheduler, |
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| 275 | the_thread, |
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| 276 | priority, |
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| 277 | false |
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| 278 | ); |
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[1b1be254] | 279 | } |
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| 280 | } |
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| 281 | } |
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| 282 | |
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| 283 | void _Thread_Close( Thread_Control *the_thread, Thread_Control *executing ) |
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| 284 | { |
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| 285 | _Assert( _Thread_Is_life_protected( executing->Life.state ) ); |
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| 286 | |
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| 287 | _Objects_Close( |
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| 288 | _Objects_Get_information_id( the_thread->Object.id ), |
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| 289 | &the_thread->Object |
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| 290 | ); |
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| 291 | |
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| 292 | if ( _States_Is_dormant( the_thread->current_state ) ) { |
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| 293 | _Thread_Make_zombie( the_thread ); |
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| 294 | } else { |
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| 295 | if ( |
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| 296 | the_thread != executing |
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| 297 | && !_Thread_Is_life_terminating( executing->Life.state ) |
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| 298 | ) { |
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| 299 | /* |
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| 300 | * Wait for termination of victim thread. If the executing thread is |
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| 301 | * also terminated, then do not wait. This avoids potential cyclic |
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| 302 | * dependencies and thus dead lock. |
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| 303 | */ |
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| 304 | the_thread->Life.terminator = executing; |
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| 305 | _Thread_Set_state( executing, STATES_WAITING_FOR_TERMINATION ); |
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| 306 | } |
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| 307 | |
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| 308 | _Thread_Request_life_change( |
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| 309 | the_thread, |
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| 310 | executing, |
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| 311 | executing->current_priority, |
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| 312 | THREAD_LIFE_TERMINATING |
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| 313 | ); |
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| 314 | } |
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[5c731a83] | 315 | } |
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[05279b84] | 316 | |
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[5c731a83] | 317 | bool _Thread_Restart( |
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| 318 | Thread_Control *the_thread, |
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[8690b53] | 319 | Thread_Control *executing, |
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[5c731a83] | 320 | void *pointer_argument, |
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| 321 | Thread_Entry_numeric_type numeric_argument |
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| 322 | ) |
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| 323 | { |
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| 324 | if ( !_States_Is_dormant( the_thread->current_state ) ) { |
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[084c5cc] | 325 | the_thread->Start.pointer_argument = pointer_argument; |
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| 326 | the_thread->Start.numeric_argument = numeric_argument; |
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| 327 | |
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[8690b53] | 328 | _Thread_Request_life_change( |
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| 329 | the_thread, |
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[226c731] | 330 | executing, |
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[1b1be254] | 331 | the_thread->Start.initial_priority, |
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| 332 | THREAD_LIFE_RESTARTING |
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[8690b53] | 333 | ); |
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[05279b84] | 334 | |
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[aae7f1a1] | 335 | return true; |
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[05df0a8] | 336 | } |
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[05279b84] | 337 | |
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[aae7f1a1] | 338 | return false; |
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[05df0a8] | 339 | } |
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[1b1be254] | 340 | |
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| 341 | bool _Thread_Set_life_protection( bool protect ) |
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| 342 | { |
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| 343 | bool previous_life_protection; |
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| 344 | ISR_Level level; |
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| 345 | Per_CPU_Control *cpu; |
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| 346 | Thread_Control *executing; |
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| 347 | Thread_Life_state previous_life_state; |
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| 348 | |
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| 349 | cpu = _Thread_Action_ISR_disable_and_acquire_for_executing( &level ); |
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| 350 | executing = cpu->executing; |
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| 351 | |
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| 352 | previous_life_state = executing->Life.state; |
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| 353 | previous_life_protection = _Thread_Is_life_protected( previous_life_state ); |
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| 354 | |
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| 355 | if ( protect ) { |
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| 356 | executing->Life.state = previous_life_state | THREAD_LIFE_PROTECTED; |
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| 357 | } else { |
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| 358 | executing->Life.state = previous_life_state & ~THREAD_LIFE_PROTECTED; |
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| 359 | } |
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| 360 | |
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| 361 | _Thread_Action_release_and_ISR_enable( cpu, level ); |
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| 362 | |
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| 363 | #if defined(RTEMS_SMP) |
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| 364 | /* |
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| 365 | * On SMP configurations it is possible that a life change of an executing |
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| 366 | * thread is requested, but this thread didn't notice it yet. The life |
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| 367 | * change is first marked in the life state field and then all scheduling and |
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| 368 | * other thread state updates are performed. The last step is to issues an |
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| 369 | * inter-processor interrupt if necessary. Since this takes some time we |
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| 370 | * have to synchronize here. |
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| 371 | */ |
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| 372 | if ( |
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| 373 | !_Thread_Is_life_protected( previous_life_state ) |
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| 374 | && _Thread_Is_life_changing( previous_life_state ) |
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| 375 | ) { |
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| 376 | _Thread_Disable_dispatch(); |
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| 377 | _Thread_Enable_dispatch(); |
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| 378 | |
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| 379 | _Assert_Not_reached(); |
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| 380 | } |
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| 381 | #endif |
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| 382 | |
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| 383 | if ( |
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| 384 | !protect |
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| 385 | && _Thread_Is_life_changing( previous_life_state ) |
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| 386 | ) { |
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| 387 | _Thread_Disable_dispatch(); |
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| 388 | _Thread_Start_life_change_for_executing( executing ); |
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| 389 | _Thread_Enable_dispatch(); |
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| 390 | |
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| 391 | _Assert_Not_reached(); |
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| 392 | } |
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| 393 | |
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| 394 | return previous_life_protection; |
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| 395 | } |
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