[ac7d5ef0] | 1 | /* |
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| 2 | * Thread Handler |
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| 3 | * |
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| 4 | * |
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| 5 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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| 6 | * On-Line Applications Research Corporation (OAR). |
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| 7 | * All rights assigned to U.S. Government, 1994. |
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| 8 | * |
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| 9 | * This material may be reproduced by or for the U.S. Government pursuant |
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| 10 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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| 11 | * notice must appear in all copies of this file and its derivatives. |
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| 12 | * |
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[63edbb3f] | 13 | * $Id$ |
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[ac7d5ef0] | 14 | */ |
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| 15 | |
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| 16 | #include <rtems/system.h> |
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[94b3ec59] | 17 | #include <rtems/score/apiext.h> |
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[5e9b32b] | 18 | #include <rtems/score/context.h> |
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| 19 | #include <rtems/score/interr.h> |
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| 20 | #include <rtems/score/isr.h> |
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| 21 | #include <rtems/score/object.h> |
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| 22 | #include <rtems/score/priority.h> |
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| 23 | #include <rtems/score/states.h> |
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[744d2878] | 24 | #include <rtems/score/sysstate.h> |
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[5e9b32b] | 25 | #include <rtems/score/thread.h> |
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| 26 | #include <rtems/score/threadq.h> |
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| 27 | #include <rtems/score/userext.h> |
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| 28 | #include <rtems/score/wkspace.h> |
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[ac7d5ef0] | 29 | |
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| 30 | /*PAGE |
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| 31 | * |
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| 32 | * _Thread_Handler_initialization |
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| 33 | * |
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| 34 | * This routine initializes all thread manager related data structures. |
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| 35 | * |
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| 36 | * Input parameters: |
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| 37 | * ticks_per_timeslice - clock ticks per quantum |
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[5250ff39] | 38 | * maximum_proxies - number of proxies to initialize |
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[ac7d5ef0] | 39 | * |
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| 40 | * Output parameters: NONE |
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| 41 | */ |
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| 42 | |
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[adf98bd] | 43 | char *_Thread_Idle_name = "IDLE"; |
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| 44 | |
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[ac7d5ef0] | 45 | void _Thread_Handler_initialization( |
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| 46 | unsigned32 ticks_per_timeslice, |
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[3a4ae6c] | 47 | unsigned32 maximum_extensions, |
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[ac7d5ef0] | 48 | unsigned32 maximum_proxies |
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| 49 | ) |
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| 50 | { |
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[adf98bd] | 51 | unsigned32 index; |
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[ac7d5ef0] | 52 | |
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[8faca06] | 53 | /* |
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| 54 | * BOTH stacks hooks must be set or both must be NULL. |
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| 55 | * Do not allow mixture. |
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| 56 | */ |
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| 57 | |
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| 58 | if ( !( ( _CPU_Table.stack_allocate_hook == 0 ) |
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| 59 | == ( _CPU_Table.stack_free_hook == 0 ) ) ) |
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| 60 | _Internal_error_Occurred( |
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| 61 | INTERNAL_ERROR_CORE, |
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| 62 | TRUE, |
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| 63 | INTERNAL_ERROR_BAD_STACK_HOOK |
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| 64 | ); |
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| 65 | |
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[ac7d5ef0] | 66 | _Context_Switch_necessary = FALSE; |
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| 67 | _Thread_Executing = NULL; |
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| 68 | _Thread_Heir = NULL; |
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| 69 | _Thread_Allocated_fp = NULL; |
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| 70 | |
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[3a4ae6c] | 71 | _Thread_Maximum_extensions = maximum_extensions; |
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| 72 | |
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[ac7d5ef0] | 73 | _Thread_Ticks_remaining_in_timeslice = ticks_per_timeslice; |
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| 74 | _Thread_Ticks_per_timeslice = ticks_per_timeslice; |
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| 75 | |
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| 76 | _Thread_Ready_chain = _Workspace_Allocate_or_fatal_error( |
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[3a4ae6c] | 77 | (PRIORITY_MAXIMUM + 1) * sizeof(Chain_Control) |
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[ac7d5ef0] | 78 | ); |
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| 79 | |
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[3a4ae6c] | 80 | for ( index=0; index <= PRIORITY_MAXIMUM ; index++ ) |
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[ac7d5ef0] | 81 | _Chain_Initialize_empty( &_Thread_Ready_chain[ index ] ); |
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| 82 | |
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| 83 | _Thread_MP_Handler_initialization( maximum_proxies ); |
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[adf98bd] | 84 | |
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| 85 | /* |
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| 86 | * Initialize this class of objects. |
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| 87 | */ |
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| 88 | |
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| 89 | _Objects_Initialize_information( |
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| 90 | &_Thread_Internal_information, |
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| 91 | OBJECTS_INTERNAL_THREADS, |
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| 92 | FALSE, |
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| 93 | ( _System_state_Is_multiprocessing ) ? 2 : 1, |
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| 94 | sizeof( Thread_Control ), |
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| 95 | TRUE, |
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| 96 | 8, |
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| 97 | TRUE |
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| 98 | ); |
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| 99 | |
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| 100 | } |
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| 101 | |
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| 102 | /*PAGE |
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| 103 | * |
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| 104 | * _Thread_Create_idle |
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| 105 | */ |
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| 106 | |
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| 107 | void _Thread_Create_idle( void ) |
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| 108 | { |
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[14966f8] | 109 | void *idle; |
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[adf98bd] | 110 | |
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| 111 | /* |
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| 112 | * The entire workspace is zeroed during its initialization. Thus, all |
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| 113 | * fields not explicitly assigned were explicitly zeroed by |
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| 114 | * _Workspace_Initialization. |
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| 115 | */ |
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| 116 | |
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| 117 | _Thread_Idle = _Thread_Internal_allocate(); |
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| 118 | |
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| 119 | /* |
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| 120 | * Initialize the IDLE task. |
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| 121 | */ |
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| 122 | |
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| 123 | #if (CPU_PROVIDES_IDLE_THREAD_BODY == TRUE) |
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| 124 | idle = _CPU_Thread_Idle_body; |
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| 125 | #else |
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| 126 | idle = _Thread_Idle_body; |
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| 127 | #endif |
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| 128 | |
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| 129 | if ( _CPU_Table.idle_task ) |
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| 130 | idle = _CPU_Table.idle_task; |
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| 131 | |
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| 132 | _Thread_Initialize( |
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| 133 | &_Thread_Internal_information, |
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| 134 | _Thread_Idle, |
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| 135 | NULL, /* allocate the stack */ |
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| 136 | THREAD_IDLE_STACK_SIZE, |
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| 137 | CPU_IDLE_TASK_IS_FP, |
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| 138 | PRIORITY_MAXIMUM, |
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| 139 | TRUE, /* preemptable */ |
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| 140 | FALSE, /* not timesliced */ |
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| 141 | 0, /* all interrupts enabled */ |
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| 142 | _Thread_Idle_name |
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| 143 | ); |
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| 144 | |
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| 145 | /* |
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| 146 | * WARNING!!! This is necessary to "kick" start the system and |
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| 147 | * MUST be done before _Thread_Start is invoked. |
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| 148 | */ |
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| 149 | |
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| 150 | _Thread_Heir = |
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| 151 | _Thread_Executing = _Thread_Idle; |
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| 152 | |
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| 153 | _Thread_Start( |
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| 154 | _Thread_Idle, |
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| 155 | THREAD_START_NUMERIC, |
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| 156 | idle, |
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| 157 | NULL, |
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| 158 | 0 |
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| 159 | ); |
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| 160 | |
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[ac7d5ef0] | 161 | } |
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| 162 | |
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| 163 | /*PAGE |
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| 164 | * |
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| 165 | * _Thread_Start_multitasking |
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| 166 | * |
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| 167 | * This kernel routine readies the requested thread, the thread chain |
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| 168 | * is adjusted. A new heir thread may be selected. |
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| 169 | * |
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| 170 | * Input parameters: |
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| 171 | * system_thread - pointer to system initialization thread control block |
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| 172 | * idle_thread - pointer to idle thread control block |
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| 173 | * |
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| 174 | * Output parameters: NONE |
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| 175 | * |
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| 176 | * NOTE: This routine uses the "blocking" heir selection mechanism. |
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| 177 | * This insures the correct heir after a thread restart. |
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| 178 | * |
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| 179 | * INTERRUPT LATENCY: |
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| 180 | * ready chain |
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| 181 | * select heir |
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| 182 | */ |
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| 183 | |
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[adf98bd] | 184 | void _Thread_Start_multitasking( void ) |
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[ac7d5ef0] | 185 | { |
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[744d2878] | 186 | /* |
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| 187 | * The system is now multitasking and completely initialized. |
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| 188 | * This system thread now either "goes away" in a single processor |
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| 189 | * system or "turns into" the server thread in an MP system. |
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| 190 | */ |
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[ac7d5ef0] | 191 | |
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[744d2878] | 192 | _System_state_Set( SYSTEM_STATE_UP ); |
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[ac7d5ef0] | 193 | |
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[744d2878] | 194 | _Context_Switch_necessary = FALSE; |
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[ac7d5ef0] | 195 | |
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[744d2878] | 196 | _Thread_Executing = _Thread_Heir; |
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[ac7d5ef0] | 197 | |
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[744d2878] | 198 | _Context_Switch( &_Thread_BSP_context, &_Thread_Executing->Registers ); |
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[ac7d5ef0] | 199 | } |
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| 200 | |
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| 201 | /*PAGE |
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| 202 | * |
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| 203 | * _Thread_Dispatch |
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| 204 | * |
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| 205 | * This kernel routine determines if a dispatch is needed, and if so |
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| 206 | * dispatches to the heir thread. Once the heir is running an attempt |
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| 207 | * is made to dispatch any ASRs. |
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| 208 | * |
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| 209 | * ALTERNATE ENTRY POINTS: |
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| 210 | * void _Thread_Enable_dispatch(); |
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| 211 | * |
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| 212 | * Input parameters: NONE |
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| 213 | * |
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| 214 | * Output parameters: NONE |
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| 215 | * |
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| 216 | * INTERRUPT LATENCY: |
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| 217 | * dispatch thread |
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| 218 | * no dispatch thread |
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| 219 | */ |
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| 220 | |
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| 221 | #if ( CPU_INLINE_ENABLE_DISPATCH == FALSE ) |
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| 222 | void _Thread_Enable_dispatch( void ) |
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| 223 | { |
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| 224 | if ( --_Thread_Dispatch_disable_level ) |
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| 225 | return; |
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| 226 | _Thread_Dispatch(); |
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| 227 | } |
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| 228 | #endif |
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| 229 | |
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| 230 | void _Thread_Dispatch( void ) |
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| 231 | { |
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[7f6a24ab] | 232 | Thread_Control *executing; |
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| 233 | Thread_Control *heir; |
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| 234 | ISR_Level level; |
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[ac7d5ef0] | 235 | |
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| 236 | executing = _Thread_Executing; |
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| 237 | _ISR_Disable( level ); |
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| 238 | while ( _Context_Switch_necessary == TRUE ) { |
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| 239 | heir = _Thread_Heir; |
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| 240 | _Thread_Dispatch_disable_level = 1; |
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| 241 | _Context_Switch_necessary = FALSE; |
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| 242 | _Thread_Executing = heir; |
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| 243 | _ISR_Enable( level ); |
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| 244 | |
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[3a4ae6c] | 245 | _User_extensions_Thread_switch( executing, heir ); |
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[ac7d5ef0] | 246 | |
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| 247 | _Thread_Ticks_remaining_in_timeslice = _Thread_Ticks_per_timeslice; |
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| 248 | |
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| 249 | /* |
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| 250 | * If the CPU has hardware floating point, then we must address saving |
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| 251 | * and restoring it as part of the context switch. |
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| 252 | * |
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| 253 | * The second conditional compilation section selects the algorithm used |
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| 254 | * to context switch between floating point tasks. The deferred algorithm |
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| 255 | * can be significantly better in a system with few floating point tasks |
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| 256 | * because it reduces the total number of save and restore FP context |
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| 257 | * operations. However, this algorithm can not be used on all CPUs due |
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| 258 | * to unpredictable use of FP registers by some compilers for integer |
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| 259 | * operations. |
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| 260 | */ |
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| 261 | |
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| 262 | #if ( CPU_HARDWARE_FP == TRUE ) |
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| 263 | #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) |
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| 264 | if ( (heir->fp_context != NULL) && !_Thread_Is_allocated_fp( heir ) ) { |
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| 265 | if ( _Thread_Allocated_fp != NULL ) |
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| 266 | _Context_Save_fp( &_Thread_Allocated_fp->fp_context ); |
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| 267 | _Context_Restore_fp( &heir->fp_context ); |
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| 268 | _Thread_Allocated_fp = heir; |
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| 269 | } |
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| 270 | #else |
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| 271 | if ( executing->fp_context != NULL ) |
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| 272 | _Context_Save_fp( &executing->fp_context ); |
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| 273 | |
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| 274 | if ( heir->fp_context != NULL ) |
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| 275 | _Context_Restore_fp( &heir->fp_context ); |
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| 276 | #endif |
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| 277 | #endif |
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| 278 | |
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| 279 | _Context_Switch( &executing->Registers, &heir->Registers ); |
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| 280 | |
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| 281 | executing = _Thread_Executing; |
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[3a4ae6c] | 282 | |
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[ac7d5ef0] | 283 | _ISR_Disable( level ); |
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| 284 | } |
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| 285 | |
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| 286 | _Thread_Dispatch_disable_level = 0; |
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| 287 | |
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[3a4ae6c] | 288 | _ISR_Enable( level ); |
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[ac7d5ef0] | 289 | |
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[94b3ec59] | 290 | if ( executing->do_post_task_switch_extension ) { |
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| 291 | executing->do_post_task_switch_extension = FALSE; |
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| 292 | _API_extensions_Run_postswitch(); |
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| 293 | } |
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[3a4ae6c] | 294 | |
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[ac7d5ef0] | 295 | } |
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| 296 | |
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[8faca06] | 297 | /*PAGE |
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| 298 | * |
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| 299 | * _Thread_Stack_Allocate |
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| 300 | * |
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| 301 | * Allocate the requested stack space for the thread. |
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| 302 | * return the actual size allocated after any adjustment |
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| 303 | * or return zero if the allocation failed. |
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| 304 | * Set the Start.stack field to the address of the stack |
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| 305 | */ |
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| 306 | |
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| 307 | static unsigned32 _Thread_Stack_Allocate( |
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| 308 | Thread_Control *the_thread, |
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| 309 | unsigned32 stack_size) |
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| 310 | { |
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| 311 | void *stack_addr = 0; |
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| 312 | |
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| 313 | if ( !_Stack_Is_enough( stack_size ) ) |
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| 314 | stack_size = STACK_MINIMUM_SIZE; |
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| 315 | |
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| 316 | /* |
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| 317 | * Call ONLY the CPU table stack allocate hook, _or_ the |
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| 318 | * the RTEMS workspace allocate. This is so the stack free |
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| 319 | * routine can call the correct deallocation routine. |
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| 320 | */ |
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[1543932] | 321 | |
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[8faca06] | 322 | if ( _CPU_Table.stack_allocate_hook ) |
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| 323 | { |
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| 324 | stack_addr = (*_CPU_Table.stack_allocate_hook)( stack_size ); |
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| 325 | } else { |
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[1543932] | 326 | |
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| 327 | /* |
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| 328 | * First pad the requested size so we allocate enough memory |
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| 329 | * so the context initialization can align it properly. The address |
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| 330 | * returned the workspace allocate must be directly stored in the |
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| 331 | * stack control block because it is later used in the free sequence. |
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| 332 | * |
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| 333 | * Thus it is the responsibility of the CPU dependent code to |
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| 334 | * get and keep the stack adjust factor, the stack alignment, and |
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| 335 | * the context initialization sequence in sync. |
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| 336 | */ |
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| 337 | |
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[8faca06] | 338 | stack_size = _Stack_Adjust_size( stack_size ); |
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| 339 | stack_addr = _Workspace_Allocate( stack_size ); |
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| 340 | } |
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| 341 | |
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| 342 | if ( !stack_addr ) |
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| 343 | stack_size = 0; |
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| 344 | |
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| 345 | the_thread->Start.stack = stack_addr; |
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| 346 | |
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| 347 | return stack_size; |
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| 348 | } |
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| 349 | |
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| 350 | /* |
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| 351 | * _Thread_Stack_Free |
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| 352 | * |
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| 353 | * Deallocate the Thread's stack. |
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| 354 | */ |
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| 355 | |
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| 356 | static void _Thread_Stack_Free(void *stack_addr) |
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| 357 | { |
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| 358 | /* |
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| 359 | * Call ONLY the CPU table stack free hook, or the |
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| 360 | * the RTEMS workspace free. This is so the free |
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| 361 | * routine properly matches the allocation of the stack. |
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| 362 | */ |
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[1543932] | 363 | |
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[8faca06] | 364 | if ( _CPU_Table.stack_free_hook ) |
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| 365 | (*_CPU_Table.stack_free_hook)( stack_addr ); |
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| 366 | else |
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| 367 | _Workspace_Free( stack_addr ); |
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| 368 | } |
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| 369 | |
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[7f6a24ab] | 370 | /*PAGE |
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| 371 | * |
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| 372 | * _Thread_Initialize |
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| 373 | * |
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| 374 | * XXX |
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| 375 | */ |
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| 376 | |
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| 377 | boolean _Thread_Initialize( |
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| 378 | Objects_Information *information, |
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| 379 | Thread_Control *the_thread, |
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| 380 | void *stack_area, /* NULL if to be allocated */ |
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| 381 | unsigned32 stack_size, /* insure it is >= min */ |
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| 382 | boolean is_fp, /* TRUE if thread uses FP */ |
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| 383 | Priority_Control priority, |
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[3a4ae6c] | 384 | boolean is_preemptible, |
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| 385 | boolean is_timeslice, |
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| 386 | unsigned32 isr_level, |
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[7f6a24ab] | 387 | Objects_Name name |
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| 388 | |
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| 389 | ) |
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| 390 | { |
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| 391 | unsigned32 actual_stack_size; |
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| 392 | void *stack; |
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| 393 | void *fp_area; |
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[3a4ae6c] | 394 | void *extensions_area; |
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[7f6a24ab] | 395 | |
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| 396 | /* |
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| 397 | * Allocate and Initialize the stack for this thread. |
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| 398 | */ |
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| 399 | |
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| 400 | if ( !_Stack_Is_enough( stack_size ) ) |
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[3a4ae6c] | 401 | actual_stack_size = STACK_MINIMUM_SIZE; |
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[7f6a24ab] | 402 | else |
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| 403 | actual_stack_size = stack_size; |
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| 404 | |
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| 405 | actual_stack_size = _Stack_Adjust_size( actual_stack_size ); |
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| 406 | stack = stack_area; |
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| 407 | |
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| 408 | if ( !stack ) { |
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[8faca06] | 409 | actual_stack_size = _Thread_Stack_Allocate( the_thread, stack_size ); |
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[7f6a24ab] | 410 | |
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[8faca06] | 411 | if ( !actual_stack_size ) |
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| 412 | return FALSE; /* stack allocation failed */ |
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[7f6a24ab] | 413 | |
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[8faca06] | 414 | stack = the_thread->Start.stack; |
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[7f6a24ab] | 415 | } else |
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| 416 | the_thread->Start.stack = NULL; |
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| 417 | |
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| 418 | _Stack_Initialize( |
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| 419 | &the_thread->Start.Initial_stack, |
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| 420 | stack, |
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| 421 | actual_stack_size |
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| 422 | ); |
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| 423 | |
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| 424 | /* |
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| 425 | * Allocate the floating point area for this thread |
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| 426 | */ |
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| 427 | |
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| 428 | if ( is_fp ) { |
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| 429 | |
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| 430 | fp_area = _Workspace_Allocate( CONTEXT_FP_SIZE ); |
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| 431 | if ( !fp_area ) { |
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[3a4ae6c] | 432 | if ( the_thread->Start.stack ) |
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[8faca06] | 433 | (void) _Thread_Stack_Free( the_thread->Start.stack ); |
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[7f6a24ab] | 434 | return FALSE; |
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| 435 | } |
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| 436 | fp_area = _Context_Fp_start( fp_area, 0 ); |
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| 437 | |
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| 438 | } else |
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| 439 | fp_area = NULL; |
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| 440 | |
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| 441 | the_thread->fp_context = fp_area; |
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| 442 | the_thread->Start.fp_context = fp_area; |
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| 443 | |
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[3a4ae6c] | 444 | |
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[7f6a24ab] | 445 | /* |
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[8faca06] | 446 | * Allocate the extensions area for this thread |
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[7f6a24ab] | 447 | */ |
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| 448 | |
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[3a4ae6c] | 449 | if ( _Thread_Maximum_extensions ) { |
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| 450 | extensions_area = _Workspace_Allocate( |
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| 451 | (_Thread_Maximum_extensions + 1) * sizeof( void * ) |
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| 452 | ); |
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| 453 | |
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| 454 | if ( !extensions_area ) { |
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| 455 | if ( fp_area ) |
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| 456 | (void) _Workspace_Free( fp_area ); |
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| 457 | |
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| 458 | if ( the_thread->Start.stack ) |
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[8faca06] | 459 | (void) _Thread_Stack_Free( the_thread->Start.stack ); |
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[3a4ae6c] | 460 | |
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| 461 | return FALSE; |
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| 462 | } |
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| 463 | } else |
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| 464 | extensions_area = NULL; |
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| 465 | |
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| 466 | the_thread->extensions = extensions_area; |
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[7f6a24ab] | 467 | |
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| 468 | /* |
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| 469 | * General initialization |
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| 470 | */ |
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| 471 | |
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[3a4ae6c] | 472 | the_thread->Start.is_preemptible = is_preemptible; |
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| 473 | the_thread->Start.is_timeslice = is_timeslice; |
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| 474 | the_thread->Start.isr_level = isr_level; |
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| 475 | |
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[7f6a24ab] | 476 | the_thread->current_state = STATES_DORMANT; |
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| 477 | the_thread->resource_count = 0; |
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| 478 | the_thread->real_priority = priority; |
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| 479 | the_thread->Start.initial_priority = priority; |
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| 480 | |
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| 481 | _Thread_Set_priority( the_thread, priority ); |
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| 482 | |
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| 483 | /* |
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| 484 | * Open the object |
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| 485 | */ |
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| 486 | |
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| 487 | _Objects_Open( information, &the_thread->Object, name ); |
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| 488 | |
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| 489 | /* |
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| 490 | * Invoke create extensions |
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| 491 | */ |
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| 492 | |
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[3a4ae6c] | 493 | if ( !_User_extensions_Thread_create( the_thread ) ) { |
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| 494 | |
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| 495 | if ( extensions_area ) |
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| 496 | (void) _Workspace_Free( extensions_area ); |
---|
| 497 | |
---|
| 498 | if ( fp_area ) |
---|
| 499 | (void) _Workspace_Free( fp_area ); |
---|
| 500 | |
---|
| 501 | if ( the_thread->Start.stack ) |
---|
[8faca06] | 502 | (void) _Thread_Stack_Free( the_thread->Start.stack ); |
---|
[3a4ae6c] | 503 | |
---|
| 504 | return FALSE; |
---|
| 505 | } |
---|
[7f6a24ab] | 506 | |
---|
| 507 | return TRUE; |
---|
[3a4ae6c] | 508 | |
---|
[7f6a24ab] | 509 | } |
---|
| 510 | |
---|
| 511 | /* |
---|
| 512 | * _Thread_Start |
---|
| 513 | * |
---|
| 514 | * DESCRIPTION: |
---|
| 515 | * |
---|
| 516 | * XXX |
---|
| 517 | */ |
---|
| 518 | |
---|
| 519 | boolean _Thread_Start( |
---|
| 520 | Thread_Control *the_thread, |
---|
| 521 | Thread_Start_types the_prototype, |
---|
| 522 | void *entry_point, |
---|
| 523 | void *pointer_argument, |
---|
| 524 | unsigned32 numeric_argument |
---|
| 525 | ) |
---|
| 526 | { |
---|
| 527 | if ( _States_Is_dormant( the_thread->current_state ) ) { |
---|
| 528 | |
---|
| 529 | the_thread->Start.entry_point = entry_point; |
---|
| 530 | |
---|
| 531 | the_thread->Start.prototype = the_prototype; |
---|
| 532 | the_thread->Start.pointer_argument = pointer_argument; |
---|
| 533 | the_thread->Start.numeric_argument = numeric_argument; |
---|
| 534 | |
---|
| 535 | _Thread_Load_environment( the_thread ); |
---|
| 536 | |
---|
| 537 | _Thread_Ready( the_thread ); |
---|
| 538 | |
---|
[3a4ae6c] | 539 | _User_extensions_Thread_start( the_thread ); |
---|
[7f6a24ab] | 540 | |
---|
| 541 | return TRUE; |
---|
| 542 | } |
---|
| 543 | |
---|
| 544 | return FALSE; |
---|
| 545 | |
---|
| 546 | } |
---|
| 547 | |
---|
| 548 | /* |
---|
| 549 | * _Thread_Restart |
---|
| 550 | * |
---|
| 551 | * DESCRIPTION: |
---|
| 552 | * |
---|
| 553 | * XXX |
---|
| 554 | */ |
---|
| 555 | |
---|
| 556 | boolean _Thread_Restart( |
---|
| 557 | Thread_Control *the_thread, |
---|
| 558 | void *pointer_argument, |
---|
| 559 | unsigned32 numeric_argument |
---|
| 560 | ) |
---|
| 561 | { |
---|
| 562 | if ( !_States_Is_dormant( the_thread->current_state ) ) { |
---|
| 563 | |
---|
| 564 | _Thread_Set_transient( the_thread ); |
---|
| 565 | the_thread->resource_count = 0; |
---|
[3a4ae6c] | 566 | the_thread->is_preemptible = the_thread->Start.is_preemptible; |
---|
| 567 | the_thread->is_timeslice = the_thread->Start.is_timeslice; |
---|
[7f6a24ab] | 568 | |
---|
| 569 | the_thread->Start.pointer_argument = pointer_argument; |
---|
| 570 | the_thread->Start.numeric_argument = numeric_argument; |
---|
| 571 | |
---|
| 572 | if ( !_Thread_queue_Extract_with_proxy( the_thread ) ) { |
---|
| 573 | |
---|
| 574 | if ( _Watchdog_Is_active( &the_thread->Timer ) ) |
---|
| 575 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
| 576 | } |
---|
| 577 | |
---|
| 578 | if ( the_thread->current_priority != the_thread->Start.initial_priority ) { |
---|
| 579 | the_thread->real_priority = the_thread->Start.initial_priority; |
---|
| 580 | _Thread_Set_priority( the_thread, the_thread->Start.initial_priority ); |
---|
| 581 | } |
---|
| 582 | |
---|
| 583 | _Thread_Load_environment( the_thread ); |
---|
| 584 | |
---|
| 585 | _Thread_Ready( the_thread ); |
---|
| 586 | |
---|
[3a4ae6c] | 587 | _User_extensions_Thread_restart( the_thread ); |
---|
[7f6a24ab] | 588 | |
---|
| 589 | if ( _Thread_Is_executing ( the_thread ) ) |
---|
| 590 | _Thread_Restart_self(); |
---|
| 591 | |
---|
| 592 | return TRUE; |
---|
| 593 | } |
---|
| 594 | |
---|
| 595 | return FALSE; |
---|
| 596 | } |
---|
| 597 | |
---|
| 598 | /* |
---|
| 599 | * _Thread_Close |
---|
| 600 | * |
---|
| 601 | * DESCRIPTION: |
---|
| 602 | * |
---|
| 603 | * XXX |
---|
| 604 | */ |
---|
| 605 | |
---|
| 606 | void _Thread_Close( |
---|
| 607 | Objects_Information *information, |
---|
| 608 | Thread_Control *the_thread |
---|
| 609 | ) |
---|
| 610 | { |
---|
| 611 | _Objects_Close( information, &the_thread->Object ); |
---|
| 612 | |
---|
| 613 | _Thread_Set_state( the_thread, STATES_TRANSIENT ); |
---|
| 614 | |
---|
| 615 | if ( !_Thread_queue_Extract_with_proxy( the_thread ) ) { |
---|
| 616 | |
---|
| 617 | if ( _Watchdog_Is_active( &the_thread->Timer ) ) |
---|
| 618 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
| 619 | } |
---|
| 620 | |
---|
[3a4ae6c] | 621 | _User_extensions_Thread_delete( the_thread ); |
---|
[7f6a24ab] | 622 | |
---|
| 623 | #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) |
---|
| 624 | if ( _Thread_Is_allocated_fp( the_thread ) ) |
---|
| 625 | _Thread_Deallocate_fp(); |
---|
| 626 | #endif |
---|
| 627 | the_thread->fp_context = NULL; |
---|
| 628 | |
---|
[d434b8d6] | 629 | if ( the_thread->Start.fp_context ) |
---|
[7f6a24ab] | 630 | (void) _Workspace_Free( the_thread->Start.fp_context ); |
---|
| 631 | |
---|
| 632 | if ( the_thread->Start.stack ) |
---|
| 633 | (void) _Workspace_Free( the_thread->Start.stack ); |
---|
[3a4ae6c] | 634 | |
---|
| 635 | if ( the_thread->extensions ) |
---|
| 636 | (void) _Workspace_Free( the_thread->extensions ); |
---|
[b3ac6a8d] | 637 | |
---|
| 638 | the_thread->Start.stack = NULL; |
---|
| 639 | the_thread->extensions = NULL; |
---|
[7f6a24ab] | 640 | } |
---|
| 641 | |
---|
[ac7d5ef0] | 642 | /*PAGE |
---|
| 643 | * |
---|
| 644 | * _Thread_Ready |
---|
| 645 | * |
---|
| 646 | * This kernel routine readies the requested thread, the thread chain |
---|
| 647 | * is adjusted. A new heir thread may be selected. |
---|
| 648 | * |
---|
| 649 | * Input parameters: |
---|
| 650 | * the_thread - pointer to thread control block |
---|
| 651 | * |
---|
| 652 | * Output parameters: NONE |
---|
| 653 | * |
---|
| 654 | * NOTE: This routine uses the "blocking" heir selection mechanism. |
---|
| 655 | * This insures the correct heir after a thread restart. |
---|
| 656 | * |
---|
| 657 | * INTERRUPT LATENCY: |
---|
| 658 | * ready chain |
---|
| 659 | * select heir |
---|
| 660 | */ |
---|
| 661 | |
---|
| 662 | void _Thread_Ready( |
---|
| 663 | Thread_Control *the_thread |
---|
| 664 | ) |
---|
| 665 | { |
---|
| 666 | ISR_Level level; |
---|
| 667 | Thread_Control *heir; |
---|
| 668 | |
---|
| 669 | _ISR_Disable( level ); |
---|
| 670 | |
---|
| 671 | the_thread->current_state = STATES_READY; |
---|
| 672 | |
---|
| 673 | _Priority_Add_to_bit_map( &the_thread->Priority_map ); |
---|
| 674 | |
---|
| 675 | _Chain_Append_unprotected( the_thread->ready, &the_thread->Object.Node ); |
---|
| 676 | |
---|
| 677 | _ISR_Flash( level ); |
---|
| 678 | |
---|
| 679 | _Thread_Calculate_heir(); |
---|
| 680 | |
---|
| 681 | heir = _Thread_Heir; |
---|
| 682 | |
---|
[3a4ae6c] | 683 | if ( !_Thread_Is_executing( heir ) && _Thread_Executing->is_preemptible ) |
---|
[ac7d5ef0] | 684 | _Context_Switch_necessary = TRUE; |
---|
| 685 | |
---|
| 686 | _ISR_Enable( level ); |
---|
| 687 | } |
---|
| 688 | |
---|
| 689 | /*PAGE |
---|
| 690 | * |
---|
| 691 | * _Thread_Clear_state |
---|
| 692 | * |
---|
| 693 | * This kernel routine clears the appropriate states in the |
---|
| 694 | * requested thread. The thread ready chain is adjusted if |
---|
| 695 | * necessary and the Heir thread is set accordingly. |
---|
| 696 | * |
---|
| 697 | * Input parameters: |
---|
| 698 | * the_thread - pointer to thread control block |
---|
| 699 | * state - state set to clear |
---|
| 700 | * |
---|
| 701 | * Output parameters: NONE |
---|
| 702 | * |
---|
| 703 | * INTERRUPT LATENCY: |
---|
| 704 | * priority map |
---|
| 705 | * select heir |
---|
| 706 | */ |
---|
| 707 | |
---|
| 708 | void _Thread_Clear_state( |
---|
| 709 | Thread_Control *the_thread, |
---|
| 710 | States_Control state |
---|
| 711 | ) |
---|
| 712 | { |
---|
| 713 | ISR_Level level; |
---|
| 714 | |
---|
| 715 | _ISR_Disable( level ); |
---|
| 716 | the_thread->current_state = |
---|
| 717 | _States_Clear( state, the_thread->current_state ); |
---|
| 718 | |
---|
| 719 | if ( _States_Is_ready( the_thread->current_state ) ) { |
---|
| 720 | |
---|
| 721 | _Priority_Add_to_bit_map( &the_thread->Priority_map ); |
---|
| 722 | |
---|
| 723 | _Chain_Append_unprotected( the_thread->ready, &the_thread->Object.Node ); |
---|
| 724 | |
---|
| 725 | _ISR_Flash( level ); |
---|
| 726 | |
---|
| 727 | if ( the_thread->current_priority < _Thread_Heir->current_priority ) { |
---|
| 728 | _Thread_Heir = the_thread; |
---|
[3a4ae6c] | 729 | if ( _Thread_Executing->is_preemptible || |
---|
[3a5dbdc] | 730 | the_thread->current_priority == 0 ) |
---|
[ac7d5ef0] | 731 | _Context_Switch_necessary = TRUE; |
---|
| 732 | } |
---|
| 733 | } |
---|
| 734 | _ISR_Enable( level ); |
---|
| 735 | } |
---|
| 736 | |
---|
| 737 | /*PAGE |
---|
| 738 | * |
---|
| 739 | * _Thread_Set_state |
---|
| 740 | * |
---|
| 741 | * This kernel routine sets the requested state in the THREAD. The |
---|
| 742 | * THREAD chain is adjusted if necessary. |
---|
| 743 | * |
---|
| 744 | * Input parameters: |
---|
| 745 | * the_thread - pointer to thread control block |
---|
| 746 | * state - state to be set |
---|
| 747 | * |
---|
| 748 | * Output parameters: NONE |
---|
| 749 | * |
---|
| 750 | * INTERRUPT LATENCY: |
---|
| 751 | * ready chain |
---|
| 752 | * select map |
---|
| 753 | */ |
---|
| 754 | |
---|
| 755 | void _Thread_Set_state( |
---|
| 756 | Thread_Control *the_thread, |
---|
| 757 | States_Control state |
---|
| 758 | ) |
---|
| 759 | { |
---|
| 760 | ISR_Level level; |
---|
| 761 | Chain_Control *ready; |
---|
| 762 | |
---|
| 763 | ready = the_thread->ready; |
---|
| 764 | _ISR_Disable( level ); |
---|
| 765 | if ( !_States_Is_ready( the_thread->current_state ) ) { |
---|
| 766 | the_thread->current_state = |
---|
| 767 | _States_Set( state, the_thread->current_state ); |
---|
| 768 | _ISR_Enable( level ); |
---|
| 769 | return; |
---|
| 770 | } |
---|
| 771 | |
---|
| 772 | the_thread->current_state = state; |
---|
| 773 | |
---|
| 774 | if ( _Chain_Has_only_one_node( ready ) ) { |
---|
| 775 | |
---|
| 776 | _Chain_Initialize_empty( ready ); |
---|
| 777 | _Priority_Remove_from_bit_map( &the_thread->Priority_map ); |
---|
| 778 | |
---|
| 779 | } else |
---|
| 780 | _Chain_Extract_unprotected( &the_thread->Object.Node ); |
---|
| 781 | |
---|
| 782 | _ISR_Flash( level ); |
---|
| 783 | |
---|
| 784 | if ( _Thread_Is_heir( the_thread ) ) |
---|
| 785 | _Thread_Calculate_heir(); |
---|
| 786 | |
---|
| 787 | if ( _Thread_Is_executing( the_thread ) ) |
---|
| 788 | _Context_Switch_necessary = TRUE; |
---|
| 789 | |
---|
| 790 | _ISR_Enable( level ); |
---|
| 791 | } |
---|
| 792 | |
---|
| 793 | /*PAGE |
---|
| 794 | * |
---|
| 795 | * _Thread_Set_transient |
---|
| 796 | * |
---|
| 797 | * This kernel routine places the requested thread in the transient state |
---|
| 798 | * which will remove it from the ready queue, if necessary. No |
---|
| 799 | * rescheduling is necessary because it is assumed that the transient |
---|
| 800 | * state will be cleared before dispatching is enabled. |
---|
| 801 | * |
---|
| 802 | * Input parameters: |
---|
| 803 | * the_thread - pointer to thread control block |
---|
| 804 | * |
---|
| 805 | * Output parameters: NONE |
---|
| 806 | * |
---|
| 807 | * INTERRUPT LATENCY: |
---|
| 808 | * only case |
---|
| 809 | */ |
---|
| 810 | |
---|
| 811 | void _Thread_Set_transient( |
---|
| 812 | Thread_Control *the_thread |
---|
| 813 | ) |
---|
| 814 | { |
---|
| 815 | ISR_Level level; |
---|
| 816 | unsigned32 old_state; |
---|
| 817 | Chain_Control *ready; |
---|
| 818 | |
---|
| 819 | ready = the_thread->ready; |
---|
| 820 | _ISR_Disable( level ); |
---|
| 821 | |
---|
| 822 | old_state = the_thread->current_state; |
---|
| 823 | the_thread->current_state = _States_Set( STATES_TRANSIENT, old_state ); |
---|
| 824 | |
---|
| 825 | if ( _States_Is_ready( old_state ) ) { |
---|
| 826 | if ( _Chain_Has_only_one_node( ready ) ) { |
---|
| 827 | |
---|
| 828 | _Chain_Initialize_empty( ready ); |
---|
| 829 | _Priority_Remove_from_bit_map( &the_thread->Priority_map ); |
---|
| 830 | |
---|
| 831 | } else |
---|
| 832 | _Chain_Extract_unprotected( &the_thread->Object.Node ); |
---|
| 833 | } |
---|
| 834 | |
---|
| 835 | _ISR_Enable( level ); |
---|
| 836 | |
---|
| 837 | } |
---|
| 838 | |
---|
| 839 | /*PAGE |
---|
| 840 | * |
---|
| 841 | * _Thread_Reset_timeslice |
---|
| 842 | * |
---|
| 843 | * This routine will remove the running thread from the ready chain |
---|
| 844 | * and place it immediately at the rear of this chain and then the |
---|
| 845 | * timeslice counter is reset. The heir THREAD will be updated if |
---|
| 846 | * the running is also the currently the heir. |
---|
| 847 | * |
---|
| 848 | * Input parameters: NONE |
---|
| 849 | * |
---|
| 850 | * Output parameters: NONE |
---|
| 851 | * |
---|
| 852 | * INTERRUPT LATENCY: |
---|
| 853 | * ready chain |
---|
| 854 | * select heir |
---|
| 855 | */ |
---|
| 856 | |
---|
| 857 | void _Thread_Reset_timeslice( void ) |
---|
| 858 | { |
---|
| 859 | ISR_Level level; |
---|
| 860 | Thread_Control *executing; |
---|
| 861 | Chain_Control *ready; |
---|
| 862 | |
---|
| 863 | executing = _Thread_Executing; |
---|
| 864 | ready = executing->ready; |
---|
| 865 | _ISR_Disable( level ); |
---|
| 866 | if ( _Chain_Has_only_one_node( ready ) ) { |
---|
| 867 | _Thread_Ticks_remaining_in_timeslice = _Thread_Ticks_per_timeslice; |
---|
| 868 | _ISR_Enable( level ); |
---|
| 869 | return; |
---|
| 870 | } |
---|
| 871 | _Chain_Extract_unprotected( &executing->Object.Node ); |
---|
| 872 | _Chain_Append_unprotected( ready, &executing->Object.Node ); |
---|
| 873 | |
---|
| 874 | _ISR_Flash( level ); |
---|
| 875 | |
---|
| 876 | if ( _Thread_Is_heir( executing ) ) |
---|
| 877 | _Thread_Heir = (Thread_Control *) ready->first; |
---|
| 878 | |
---|
| 879 | _Context_Switch_necessary = TRUE; |
---|
| 880 | |
---|
| 881 | _ISR_Enable( level ); |
---|
| 882 | } |
---|
| 883 | |
---|
| 884 | /*PAGE |
---|
| 885 | * |
---|
| 886 | * _Thread_Tickle_timeslice |
---|
| 887 | * |
---|
| 888 | * This scheduler routine determines if timeslicing is enabled |
---|
| 889 | * for the currently executing thread and, if so, updates the |
---|
| 890 | * timeslice count and checks for timeslice expiration. |
---|
| 891 | * |
---|
| 892 | * Input parameters: NONE |
---|
| 893 | * |
---|
| 894 | * Output parameters: NONE |
---|
| 895 | */ |
---|
| 896 | |
---|
| 897 | void _Thread_Tickle_timeslice( void ) |
---|
| 898 | { |
---|
[3a4ae6c] | 899 | if ( !_Thread_Executing->is_timeslice || |
---|
| 900 | !_Thread_Executing->is_preemptible || |
---|
| 901 | !_States_Is_ready( _Thread_Executing->current_state ) ) |
---|
| 902 | return; |
---|
| 903 | |
---|
| 904 | if ( --_Thread_Ticks_remaining_in_timeslice == 0 ) { |
---|
[ac7d5ef0] | 905 | _Thread_Reset_timeslice(); |
---|
| 906 | } |
---|
| 907 | } |
---|
| 908 | |
---|
| 909 | /*PAGE |
---|
| 910 | * |
---|
| 911 | * _Thread_Yield_processor |
---|
| 912 | * |
---|
| 913 | * This kernel routine will remove the running THREAD from the ready chain |
---|
| 914 | * and place it immediatly at the rear of this chain. Reset timeslice |
---|
| 915 | * and yield the processor functions both use this routine, therefore if |
---|
| 916 | * reset is TRUE and this is the only thread on the chain then the |
---|
| 917 | * timeslice counter is reset. The heir THREAD will be updated if the |
---|
| 918 | * running is also the currently the heir. |
---|
| 919 | * |
---|
| 920 | * Input parameters: NONE |
---|
| 921 | * |
---|
| 922 | * Output parameters: NONE |
---|
| 923 | * |
---|
| 924 | * INTERRUPT LATENCY: |
---|
| 925 | * ready chain |
---|
| 926 | * select heir |
---|
| 927 | */ |
---|
| 928 | |
---|
| 929 | void _Thread_Yield_processor( void ) |
---|
| 930 | { |
---|
| 931 | ISR_Level level; |
---|
| 932 | Thread_Control *executing; |
---|
| 933 | Chain_Control *ready; |
---|
| 934 | |
---|
| 935 | executing = _Thread_Executing; |
---|
| 936 | ready = executing->ready; |
---|
| 937 | _ISR_Disable( level ); |
---|
| 938 | if ( !_Chain_Has_only_one_node( ready ) ) { |
---|
| 939 | _Chain_Extract_unprotected( &executing->Object.Node ); |
---|
| 940 | _Chain_Append_unprotected( ready, &executing->Object.Node ); |
---|
| 941 | |
---|
| 942 | _ISR_Flash( level ); |
---|
| 943 | |
---|
| 944 | if ( _Thread_Is_heir( executing ) ) |
---|
| 945 | _Thread_Heir = (Thread_Control *) ready->first; |
---|
| 946 | _Context_Switch_necessary = TRUE; |
---|
| 947 | } |
---|
| 948 | else if ( !_Thread_Is_heir( executing ) ) |
---|
| 949 | _Context_Switch_necessary = TRUE; |
---|
| 950 | |
---|
| 951 | _ISR_Enable( level ); |
---|
| 952 | } |
---|
| 953 | |
---|
| 954 | /*PAGE |
---|
| 955 | * |
---|
| 956 | * _Thread_Load_environment |
---|
| 957 | * |
---|
| 958 | * Load starting environment for another thread from its start area in the |
---|
| 959 | * thread. Only called from t_restart and t_start. |
---|
| 960 | * |
---|
| 961 | * Input parameters: |
---|
| 962 | * the_thread - thread control block pointer |
---|
| 963 | * |
---|
| 964 | * Output parameters: NONE |
---|
| 965 | */ |
---|
| 966 | |
---|
| 967 | void _Thread_Load_environment( |
---|
| 968 | Thread_Control *the_thread |
---|
| 969 | ) |
---|
| 970 | { |
---|
[9700578] | 971 | boolean is_fp = FALSE; |
---|
| 972 | |
---|
[ac7d5ef0] | 973 | if ( the_thread->Start.fp_context ) { |
---|
| 974 | the_thread->fp_context = the_thread->Start.fp_context; |
---|
| 975 | _Context_Initialize_fp( &the_thread->fp_context ); |
---|
[9700578] | 976 | is_fp = TRUE; |
---|
[ac7d5ef0] | 977 | } |
---|
| 978 | |
---|
[94b3ec59] | 979 | the_thread->do_post_task_switch_extension = FALSE; |
---|
[3a4ae6c] | 980 | the_thread->is_preemptible = the_thread->Start.is_preemptible; |
---|
| 981 | the_thread->is_timeslice = the_thread->Start.is_timeslice; |
---|
| 982 | |
---|
[ac7d5ef0] | 983 | _Context_Initialize( |
---|
| 984 | &the_thread->Registers, |
---|
| 985 | the_thread->Start.Initial_stack.area, |
---|
| 986 | the_thread->Start.Initial_stack.size, |
---|
[3a4ae6c] | 987 | the_thread->Start.isr_level, |
---|
[9700578] | 988 | _Thread_Handler, |
---|
| 989 | is_fp |
---|
[ac7d5ef0] | 990 | ); |
---|
| 991 | |
---|
| 992 | } |
---|
| 993 | |
---|
| 994 | /*PAGE |
---|
| 995 | * |
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| 996 | * _Thread_Handler |
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| 997 | * |
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| 998 | * This routine is the default thread exitted error handler. It is |
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| 999 | * returned to when a thread exits. The configured fatal error handler |
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| 1000 | * is invoked to process the exit. |
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| 1001 | * |
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| 1002 | * Input parameters: NONE |
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| 1003 | * |
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| 1004 | * Output parameters: NONE |
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| 1005 | */ |
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| 1006 | |
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| 1007 | void _Thread_Handler( void ) |
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| 1008 | { |
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| 1009 | Thread_Control *executing; |
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| 1010 | |
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| 1011 | executing = _Thread_Executing; |
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| 1012 | |
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| 1013 | /* |
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[7979e35] | 1014 | * Take care that 'begin' extensions get to complete before |
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| 1015 | * 'switch' extensions can run. This means must keep dispatch |
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| 1016 | * disabled until all 'begin' extensions complete. |
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[ac7d5ef0] | 1017 | */ |
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[7979e35] | 1018 | |
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[3a4ae6c] | 1019 | _User_extensions_Thread_begin( executing ); |
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[7979e35] | 1020 | |
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| 1021 | /* |
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| 1022 | * At this point, the dispatch disable level BETTER be 1. |
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| 1023 | */ |
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[ac7d5ef0] | 1024 | |
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[7979e35] | 1025 | _Thread_Enable_dispatch(); |
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| 1026 | |
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[3a4ae6c] | 1027 | switch ( executing->Start.prototype ) { |
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[7f6a24ab] | 1028 | case THREAD_START_NUMERIC: |
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| 1029 | (*executing->Start.entry_point)( executing->Start.numeric_argument ); |
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| 1030 | break; |
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| 1031 | case THREAD_START_POINTER: |
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| 1032 | (*executing->Start.entry_point)( executing->Start.pointer_argument ); |
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| 1033 | break; |
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| 1034 | case THREAD_START_BOTH_POINTER_FIRST: |
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| 1035 | (*executing->Start.entry_point)( |
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| 1036 | executing->Start.pointer_argument, |
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| 1037 | executing->Start.numeric_argument |
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| 1038 | ); |
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| 1039 | break; |
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| 1040 | case THREAD_START_BOTH_NUMERIC_FIRST: |
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| 1041 | (*executing->Start.entry_point)( |
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| 1042 | executing->Start.numeric_argument, |
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| 1043 | executing->Start.pointer_argument |
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| 1044 | ); |
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| 1045 | break; |
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| 1046 | } |
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[ac7d5ef0] | 1047 | |
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[3a4ae6c] | 1048 | _User_extensions_Thread_exitted( executing ); |
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[ac7d5ef0] | 1049 | |
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[3a4ae6c] | 1050 | _Internal_error_Occurred( |
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| 1051 | INTERNAL_ERROR_CORE, |
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| 1052 | TRUE, |
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| 1053 | INTERNAL_ERROR_THREAD_EXITTED |
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| 1054 | ); |
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[ac7d5ef0] | 1055 | } |
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| 1056 | |
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| 1057 | /*PAGE |
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| 1058 | * |
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| 1059 | * _Thread_Delay_ended |
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| 1060 | * |
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| 1061 | * This routine processes a thread whose delay period has ended. |
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| 1062 | * It is called by the watchdog handler. |
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| 1063 | * |
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| 1064 | * Input parameters: |
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| 1065 | * id - thread id |
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| 1066 | * |
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| 1067 | * Output parameters: NONE |
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| 1068 | */ |
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| 1069 | |
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| 1070 | void _Thread_Delay_ended( |
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| 1071 | Objects_Id id, |
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| 1072 | void *ignored |
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| 1073 | ) |
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| 1074 | { |
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[45819022] | 1075 | Thread_Control *the_thread; |
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| 1076 | Objects_Locations location; |
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[ac7d5ef0] | 1077 | |
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| 1078 | the_thread = _Thread_Get( id, &location ); |
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| 1079 | switch ( location ) { |
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| 1080 | case OBJECTS_ERROR: |
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| 1081 | case OBJECTS_REMOTE: /* impossible */ |
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| 1082 | break; |
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| 1083 | case OBJECTS_LOCAL: |
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| 1084 | _Thread_Unblock( the_thread ); |
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| 1085 | _Thread_Unnest_dispatch(); |
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| 1086 | break; |
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| 1087 | } |
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| 1088 | } |
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| 1089 | |
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| 1090 | /*PAGE |
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| 1091 | * |
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| 1092 | * _Thread_Change_priority |
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| 1093 | * |
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| 1094 | * This kernel routine changes the priority of the thread. The |
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| 1095 | * thread chain is adjusted if necessary. |
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| 1096 | * |
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| 1097 | * Input parameters: |
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| 1098 | * the_thread - pointer to thread control block |
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| 1099 | * new_priority - ultimate priority |
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| 1100 | * |
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| 1101 | * Output parameters: NONE |
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| 1102 | * |
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| 1103 | * INTERRUPT LATENCY: |
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| 1104 | * ready chain |
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| 1105 | * select heir |
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| 1106 | */ |
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| 1107 | |
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| 1108 | void _Thread_Change_priority( |
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[7f6a24ab] | 1109 | Thread_Control *the_thread, |
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| 1110 | Priority_Control new_priority |
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[ac7d5ef0] | 1111 | ) |
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| 1112 | { |
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| 1113 | ISR_Level level; |
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| 1114 | |
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| 1115 | _Thread_Set_transient( the_thread ); |
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| 1116 | |
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| 1117 | if ( the_thread->current_priority != new_priority ) |
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| 1118 | _Thread_Set_priority( the_thread, new_priority ); |
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| 1119 | |
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| 1120 | _ISR_Disable( level ); |
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| 1121 | |
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| 1122 | the_thread->current_state = |
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| 1123 | _States_Clear( STATES_TRANSIENT, the_thread->current_state ); |
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| 1124 | |
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| 1125 | if ( ! _States_Is_ready( the_thread->current_state ) ) { |
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| 1126 | _ISR_Enable( level ); |
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| 1127 | return; |
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| 1128 | } |
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| 1129 | |
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| 1130 | _Priority_Add_to_bit_map( &the_thread->Priority_map ); |
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| 1131 | _Chain_Append_unprotected( the_thread->ready, &the_thread->Object.Node ); |
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| 1132 | |
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| 1133 | _ISR_Flash( level ); |
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| 1134 | |
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| 1135 | _Thread_Calculate_heir(); |
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| 1136 | |
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| 1137 | if ( !_Thread_Is_executing_also_the_heir() && |
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[3a4ae6c] | 1138 | _Thread_Executing->is_preemptible ) |
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[ac7d5ef0] | 1139 | _Context_Switch_necessary = TRUE; |
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| 1140 | |
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| 1141 | _ISR_Enable( level ); |
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| 1142 | } |
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| 1143 | |
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| 1144 | /*PAGE |
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| 1145 | * |
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| 1146 | * _Thread_Set_priority |
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| 1147 | * |
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| 1148 | * This directive enables and disables several modes of |
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| 1149 | * execution for the requesting thread. |
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| 1150 | * |
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| 1151 | * Input parameters: |
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| 1152 | * the_thread - pointer to thread priority |
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| 1153 | * new_priority - new priority |
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| 1154 | * |
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| 1155 | * Output: NONE |
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| 1156 | */ |
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| 1157 | |
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| 1158 | void _Thread_Set_priority( |
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[7f6a24ab] | 1159 | Thread_Control *the_thread, |
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| 1160 | Priority_Control new_priority |
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[ac7d5ef0] | 1161 | ) |
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| 1162 | { |
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| 1163 | the_thread->current_priority = new_priority; |
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| 1164 | the_thread->ready = &_Thread_Ready_chain[ new_priority ]; |
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| 1165 | |
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| 1166 | _Priority_Initialize_information( &the_thread->Priority_map, new_priority ); |
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| 1167 | } |
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| 1168 | |
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| 1169 | /*PAGE |
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| 1170 | * |
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[3a4ae6c] | 1171 | * _Thread_Evaluate_mode |
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[ac7d5ef0] | 1172 | * |
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[3a4ae6c] | 1173 | * XXX |
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[ac7d5ef0] | 1174 | */ |
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| 1175 | |
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[3a4ae6c] | 1176 | boolean _Thread_Evaluate_mode( void ) |
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[ac7d5ef0] | 1177 | { |
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[3a4ae6c] | 1178 | Thread_Control *executing; |
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[ac7d5ef0] | 1179 | |
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[3a4ae6c] | 1180 | executing = _Thread_Executing; |
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[ac7d5ef0] | 1181 | |
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| 1182 | if ( !_States_Is_ready( executing->current_state ) || |
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[3a4ae6c] | 1183 | ( !_Thread_Is_heir( executing ) && executing->is_preemptible ) ) { |
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| 1184 | _Context_Switch_necessary = TRUE; |
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| 1185 | return TRUE; |
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| 1186 | } |
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[ac7d5ef0] | 1187 | |
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[3a4ae6c] | 1188 | return FALSE; |
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[ac7d5ef0] | 1189 | } |
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| 1190 | |
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| 1191 | /*PAGE |
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| 1192 | * |
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| 1193 | * _Thread_Get |
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| 1194 | * |
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| 1195 | * NOTE: If we are not using static inlines, this must be a real |
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| 1196 | * subroutine call. |
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[5250ff39] | 1197 | * |
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| 1198 | * NOTE: XXX... This routine may be able to be optimized. |
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[ac7d5ef0] | 1199 | */ |
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| 1200 | |
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| 1201 | #ifndef USE_INLINES |
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| 1202 | |
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[14966f8] | 1203 | Thread_Control *_Thread_Get ( |
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[5250ff39] | 1204 | Objects_Id id, |
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| 1205 | Objects_Locations *location |
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[ac7d5ef0] | 1206 | ) |
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| 1207 | { |
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[5250ff39] | 1208 | Objects_Classes the_class; |
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| 1209 | Objects_Information *information; |
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| 1210 | |
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[ac7d5ef0] | 1211 | if ( _Objects_Are_ids_equal( id, OBJECTS_ID_OF_SELF ) ) { |
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[5250ff39] | 1212 | _Thread_Disable_dispatch(); |
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| 1213 | *location = OBJECTS_LOCAL; |
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| 1214 | return( _Thread_Executing ); |
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[ac7d5ef0] | 1215 | } |
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[5250ff39] | 1216 | |
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[3a4ae6c] | 1217 | the_class = _Objects_Get_class( id ); |
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[5250ff39] | 1218 | |
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| 1219 | if ( the_class > OBJECTS_CLASSES_LAST ) { |
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| 1220 | *location = OBJECTS_ERROR; |
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| 1221 | return (Thread_Control *) 0; |
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| 1222 | } |
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| 1223 | |
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| 1224 | information = _Objects_Information_table[ the_class ]; |
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| 1225 | |
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| 1226 | if ( !information || !information->is_thread ) { |
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| 1227 | *location = OBJECTS_ERROR; |
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| 1228 | return (Thread_Control *) 0; |
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| 1229 | } |
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| 1230 | |
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| 1231 | return (Thread_Control *) _Objects_Get( information, id, location ); |
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[ac7d5ef0] | 1232 | } |
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[adf98bd] | 1233 | |
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[14966f8] | 1234 | #endif |
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| 1235 | |
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[adf98bd] | 1236 | /*PAGE |
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| 1237 | * |
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| 1238 | * _Thread_Idle_body |
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| 1239 | * |
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| 1240 | * This kernel routine is the idle thread. The idle thread runs any time |
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| 1241 | * no other thread is ready to run. This thread loops forever with |
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| 1242 | * interrupts enabled. |
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| 1243 | * |
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| 1244 | * Input parameters: |
---|
| 1245 | * ignored - this parameter is ignored |
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| 1246 | * |
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| 1247 | * Output parameters: NONE |
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| 1248 | */ |
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| 1249 | |
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| 1250 | #if (CPU_PROVIDES_IDLE_THREAD_BODY == FALSE) |
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| 1251 | Thread _Thread_Idle_body( |
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| 1252 | unsigned32 ignored |
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| 1253 | ) |
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| 1254 | { |
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| 1255 | for( ; ; ) ; |
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| 1256 | } |
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| 1257 | #endif |
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