[05df0a8] | 1 | /* |
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| 2 | * Thread Handler |
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| 3 | * |
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| 4 | * |
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[76deaf0c] | 5 | * COPYRIGHT (c) 1989-2008. |
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[05df0a8] | 6 | * On-Line Applications Research Corporation (OAR). |
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| 7 | * |
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| 8 | * The license and distribution terms for this file may be |
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| 9 | * found in found in the file LICENSE in this distribution or at |
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[dd687d97] | 10 | * http://www.rtems.com/license/LICENSE. |
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[05df0a8] | 11 | * |
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| 12 | * $Id$ |
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| 13 | */ |
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| 14 | |
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[a8eed23] | 15 | #if HAVE_CONFIG_H |
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| 16 | #include "config.h" |
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| 17 | #endif |
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| 18 | |
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[05df0a8] | 19 | #include <rtems/system.h> |
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| 20 | #include <rtems/score/apiext.h> |
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| 21 | #include <rtems/score/context.h> |
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| 22 | #include <rtems/score/interr.h> |
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| 23 | #include <rtems/score/isr.h> |
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| 24 | #include <rtems/score/object.h> |
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| 25 | #include <rtems/score/priority.h> |
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| 26 | #include <rtems/score/states.h> |
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| 27 | #include <rtems/score/sysstate.h> |
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| 28 | #include <rtems/score/thread.h> |
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| 29 | #include <rtems/score/threadq.h> |
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| 30 | #include <rtems/score/userext.h> |
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| 31 | #include <rtems/score/wkspace.h> |
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| 32 | |
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[bd59b348] | 33 | #if defined(__AVR__) |
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| 34 | #undef __USE_INIT_FINI__ |
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[42fce5d3] | 35 | #endif |
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| 36 | |
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[f73fc29] | 37 | #if defined(__USE_INIT_FINI__) |
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[d104778] | 38 | #if defined(__M32R__) |
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| 39 | #define INIT_NAME __init |
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| 40 | #else |
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| 41 | #define INIT_NAME _init |
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| 42 | #endif |
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| 43 | |
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| 44 | extern void INIT_NAME(void); |
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[f73fc29] | 45 | #endif |
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| 46 | #if defined(__USE__MAIN__) |
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| 47 | extern void _main(void); |
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| 48 | #endif |
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| 49 | |
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[05df0a8] | 50 | /*PAGE |
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| 51 | * |
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| 52 | * _Thread_Handler |
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| 53 | * |
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| 54 | * This routine is the "primal" entry point for all threads. |
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| 55 | * _Context_Initialize() dummies up the thread's initial context |
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| 56 | * to cause the first Context_Switch() to jump to _Thread_Handler(). |
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| 57 | * |
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| 58 | * This routine is the default thread exitted error handler. It is |
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| 59 | * returned to when a thread exits. The configured fatal error handler |
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| 60 | * is invoked to process the exit. |
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| 61 | * |
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| 62 | * NOTE: |
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| 63 | * |
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| 64 | * On entry, it is assumed all interrupts are blocked and that this |
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[a0ed4ed] | 65 | * routine needs to set the initial isr level. This may or may not |
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[05df0a8] | 66 | * actually be needed by the context switch routine and as a result |
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| 67 | * interrupts may already be at there proper level. Either way, |
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| 68 | * setting the initial isr level properly here is safe. |
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[a0ed4ed] | 69 | * |
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[05df0a8] | 70 | * Currently this is only really needed for the posix port, |
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| 71 | * ref: _Context_Switch in unix/cpu.c |
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| 72 | * |
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| 73 | * Input parameters: NONE |
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| 74 | * |
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| 75 | * Output parameters: NONE |
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| 76 | */ |
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| 77 | |
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| 78 | void _Thread_Handler( void ) |
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| 79 | { |
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| 80 | ISR_Level level; |
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| 81 | Thread_Control *executing; |
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[94ab166] | 82 | #if defined(__USE_INIT_FINI__) || defined(__USE__MAIN__) |
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[5b87515d] | 83 | static char doneConstructors; |
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| 84 | char doneCons; |
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| 85 | #endif |
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[05279b84] | 86 | |
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[05df0a8] | 87 | executing = _Thread_Executing; |
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[05279b84] | 88 | |
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[48816d7] | 89 | /* |
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| 90 | * Some CPUs need to tinker with the call frame or registers when the |
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| 91 | * thread actually begins to execute for the first time. This is a |
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| 92 | * hook point where the port gets a shot at doing whatever it requires. |
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| 93 | */ |
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| 94 | _Context_Initialization_at_thread_begin(); |
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| 95 | |
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[05df0a8] | 96 | /* |
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| 97 | * have to put level into a register for those cpu's that use |
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| 98 | * inline asm here |
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| 99 | */ |
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[05279b84] | 100 | |
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[05df0a8] | 101 | level = executing->Start.isr_level; |
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| 102 | _ISR_Set_level(level); |
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| 103 | |
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[94ab166] | 104 | #if defined(__USE_INIT_FINI__) || defined(__USE__MAIN__) |
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[5b87515d] | 105 | doneCons = doneConstructors; |
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| 106 | doneConstructors = 1; |
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| 107 | #endif |
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| 108 | |
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[48f89683] | 109 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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| 110 | #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) |
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| 111 | if ( (executing->fp_context != NULL) && !_Thread_Is_allocated_fp( executing ) ) { |
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| 112 | if ( _Thread_Allocated_fp != NULL ) |
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| 113 | _Context_Save_fp( &_Thread_Allocated_fp->fp_context ); |
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| 114 | _Thread_Allocated_fp = executing; |
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| 115 | } |
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| 116 | #endif |
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| 117 | #endif |
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| 118 | |
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[05df0a8] | 119 | /* |
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| 120 | * Take care that 'begin' extensions get to complete before |
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| 121 | * 'switch' extensions can run. This means must keep dispatch |
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| 122 | * disabled until all 'begin' extensions complete. |
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| 123 | */ |
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[05279b84] | 124 | |
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[05df0a8] | 125 | _User_extensions_Thread_begin( executing ); |
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[05279b84] | 126 | |
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[05df0a8] | 127 | /* |
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| 128 | * At this point, the dispatch disable level BETTER be 1. |
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| 129 | */ |
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| 130 | |
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| 131 | _Thread_Enable_dispatch(); |
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[6244ab4] | 132 | #if defined(__USE_INIT_FINI__) |
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[e1bce86] | 133 | /* |
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| 134 | * _init could be a weak symbol and we SHOULD test it but it isn't |
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| 135 | * in any configuration I know of and it generates a warning on every |
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| 136 | * RTEMS target configuration. --joel (12 May 2007) |
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| 137 | */ |
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| 138 | if (!doneCons) /* && (volatile void *)_init) */ |
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[42fce5d3] | 139 | { |
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[d104778] | 140 | INIT_NAME (); |
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[42fce5d3] | 141 | } |
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[5b87515d] | 142 | #endif |
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[94ab166] | 143 | #if defined(__USE__MAIN__) |
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[66565bb] | 144 | if (!doneCons && _main) |
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[94ab166] | 145 | __main (); |
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| 146 | #endif |
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| 147 | |
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[05df0a8] | 148 | switch ( executing->Start.prototype ) { |
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| 149 | case THREAD_START_NUMERIC: |
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[a0ed4ed] | 150 | executing->Wait.return_argument = |
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[260b0c2] | 151 | (*(Thread_Entry_numeric) executing->Start.entry_point)( |
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| 152 | executing->Start.numeric_argument |
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[05df0a8] | 153 | ); |
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| 154 | break; |
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| 155 | case THREAD_START_POINTER: |
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[260b0c2] | 156 | executing->Wait.return_argument = |
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| 157 | (*(Thread_Entry_pointer) executing->Start.entry_point)( |
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| 158 | executing->Start.pointer_argument |
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| 159 | ); |
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[05df0a8] | 160 | break; |
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| 161 | case THREAD_START_BOTH_POINTER_FIRST: |
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[a0ed4ed] | 162 | executing->Wait.return_argument = |
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| 163 | (*(Thread_Entry_both_pointer_first) executing->Start.entry_point)( |
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[260b0c2] | 164 | executing->Start.pointer_argument, |
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| 165 | executing->Start.numeric_argument |
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| 166 | ); |
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[05df0a8] | 167 | break; |
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| 168 | case THREAD_START_BOTH_NUMERIC_FIRST: |
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[a0ed4ed] | 169 | executing->Wait.return_argument = |
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| 170 | (*(Thread_Entry_both_numeric_first) executing->Start.entry_point)( |
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[260b0c2] | 171 | executing->Start.numeric_argument, |
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| 172 | executing->Start.pointer_argument |
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| 173 | ); |
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[05df0a8] | 174 | break; |
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| 175 | } |
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| 176 | |
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[260b0c2] | 177 | /* |
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| 178 | * In the switch above, the return code from the user thread body |
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| 179 | * was placed in return_argument. This assumed that if it returned |
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[a0ed4ed] | 180 | * anything (which is not supporting in all APIs), then it would be |
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[260b0c2] | 181 | * able to fit in a (void *). |
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| 182 | */ |
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| 183 | |
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[05df0a8] | 184 | _User_extensions_Thread_exitted( executing ); |
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| 185 | |
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| 186 | _Internal_error_Occurred( |
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| 187 | INTERNAL_ERROR_CORE, |
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| 188 | TRUE, |
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| 189 | INTERNAL_ERROR_THREAD_EXITTED |
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| 190 | ); |
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| 191 | } |
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