[05df0a8] | 1 | /* |
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| 2 | * Thread Handler |
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| 3 | * |
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| 4 | * |
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[08311cc3] | 5 | * COPYRIGHT (c) 1989-1999. |
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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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| 10 | * http://www.OARcorp.com/rtems/license.html. |
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| 11 | * |
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| 12 | * $Id$ |
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| 13 | */ |
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| 14 | |
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| 15 | #include <rtems/system.h> |
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| 16 | #include <rtems/score/apiext.h> |
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| 17 | #include <rtems/score/context.h> |
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| 18 | #include <rtems/score/interr.h> |
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| 19 | #include <rtems/score/isr.h> |
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| 20 | #include <rtems/score/object.h> |
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| 21 | #include <rtems/score/priority.h> |
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| 22 | #include <rtems/score/states.h> |
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| 23 | #include <rtems/score/sysstate.h> |
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| 24 | #include <rtems/score/thread.h> |
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| 25 | #include <rtems/score/threadq.h> |
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| 26 | #include <rtems/score/userext.h> |
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| 27 | #include <rtems/score/wkspace.h> |
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| 28 | |
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| 29 | /*PAGE |
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| 30 | * |
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| 31 | * _Thread_Handler |
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| 32 | * |
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| 33 | * This routine is the "primal" entry point for all threads. |
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| 34 | * _Context_Initialize() dummies up the thread's initial context |
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| 35 | * to cause the first Context_Switch() to jump to _Thread_Handler(). |
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| 36 | * |
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| 37 | * This routine is the default thread exitted error handler. It is |
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| 38 | * returned to when a thread exits. The configured fatal error handler |
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| 39 | * is invoked to process the exit. |
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| 40 | * |
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| 41 | * NOTE: |
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| 42 | * |
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| 43 | * On entry, it is assumed all interrupts are blocked and that this |
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| 44 | * routine needs to set the initial isr level. This may or may not |
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| 45 | * actually be needed by the context switch routine and as a result |
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| 46 | * interrupts may already be at there proper level. Either way, |
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| 47 | * setting the initial isr level properly here is safe. |
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| 48 | * |
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| 49 | * Currently this is only really needed for the posix port, |
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| 50 | * ref: _Context_Switch in unix/cpu.c |
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| 51 | * |
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| 52 | * Input parameters: NONE |
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| 53 | * |
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| 54 | * Output parameters: NONE |
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| 55 | */ |
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| 56 | |
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| 57 | void _Thread_Handler( void ) |
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| 58 | { |
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| 59 | ISR_Level level; |
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| 60 | Thread_Control *executing; |
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[94ab166] | 61 | #if defined(__USE_INIT_FINI__) || defined(__USE__MAIN__) |
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[5b87515d] | 62 | static char doneConstructors; |
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| 63 | char doneCons; |
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| 64 | #endif |
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[05df0a8] | 65 | |
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| 66 | executing = _Thread_Executing; |
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| 67 | |
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| 68 | /* |
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| 69 | * have to put level into a register for those cpu's that use |
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| 70 | * inline asm here |
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| 71 | */ |
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| 72 | |
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| 73 | level = executing->Start.isr_level; |
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| 74 | _ISR_Set_level(level); |
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| 75 | |
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[94ab166] | 76 | #if defined(__USE_INIT_FINI__) || defined(__USE__MAIN__) |
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[5b87515d] | 77 | doneCons = doneConstructors; |
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| 78 | doneConstructors = 1; |
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| 79 | #endif |
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| 80 | |
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[48f89683] | 81 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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| 82 | #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) |
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| 83 | if ( (executing->fp_context != NULL) && !_Thread_Is_allocated_fp( executing ) ) { |
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| 84 | if ( _Thread_Allocated_fp != NULL ) |
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| 85 | _Context_Save_fp( &_Thread_Allocated_fp->fp_context ); |
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| 86 | _Thread_Allocated_fp = executing; |
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| 87 | } |
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| 88 | #endif |
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| 89 | #endif |
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| 90 | |
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| 91 | |
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[05df0a8] | 92 | /* |
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| 93 | * Take care that 'begin' extensions get to complete before |
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| 94 | * 'switch' extensions can run. This means must keep dispatch |
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| 95 | * disabled until all 'begin' extensions complete. |
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| 96 | */ |
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| 97 | |
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| 98 | _User_extensions_Thread_begin( executing ); |
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| 99 | |
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| 100 | /* |
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| 101 | * At this point, the dispatch disable level BETTER be 1. |
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| 102 | */ |
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| 103 | |
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| 104 | _Thread_Enable_dispatch(); |
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[6244ab4] | 105 | #if defined(__USE_INIT_FINI__) |
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[5b87515d] | 106 | if (!doneCons) |
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| 107 | _init (); |
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| 108 | #endif |
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[94ab166] | 109 | #if defined(__USE__MAIN__) |
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| 110 | if (!doneCons) |
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| 111 | __main (); |
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| 112 | #endif |
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| 113 | |
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[05df0a8] | 114 | |
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| 115 | switch ( executing->Start.prototype ) { |
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| 116 | case THREAD_START_NUMERIC: |
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[260b0c2] | 117 | executing->Wait.return_argument = |
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| 118 | (*(Thread_Entry_numeric) executing->Start.entry_point)( |
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| 119 | executing->Start.numeric_argument |
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[05df0a8] | 120 | ); |
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| 121 | break; |
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| 122 | case THREAD_START_POINTER: |
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[260b0c2] | 123 | executing->Wait.return_argument = |
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| 124 | (*(Thread_Entry_pointer) executing->Start.entry_point)( |
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| 125 | executing->Start.pointer_argument |
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| 126 | ); |
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[05df0a8] | 127 | break; |
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| 128 | case THREAD_START_BOTH_POINTER_FIRST: |
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[260b0c2] | 129 | executing->Wait.return_argument = |
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| 130 | (*(Thread_Entry_both_pointer_first) executing->Start.entry_point)( |
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| 131 | executing->Start.pointer_argument, |
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| 132 | executing->Start.numeric_argument |
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| 133 | ); |
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[05df0a8] | 134 | break; |
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| 135 | case THREAD_START_BOTH_NUMERIC_FIRST: |
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[260b0c2] | 136 | executing->Wait.return_argument = |
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| 137 | (*(Thread_Entry_both_numeric_first) executing->Start.entry_point)( |
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| 138 | executing->Start.numeric_argument, |
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| 139 | executing->Start.pointer_argument |
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| 140 | ); |
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[05df0a8] | 141 | break; |
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| 142 | } |
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| 143 | |
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[260b0c2] | 144 | /* |
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| 145 | * In the switch above, the return code from the user thread body |
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| 146 | * was placed in return_argument. This assumed that if it returned |
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| 147 | * anything (which is not supporting in all APIs), then it would be |
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| 148 | * able to fit in a (void *). |
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| 149 | */ |
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| 150 | |
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[05df0a8] | 151 | _User_extensions_Thread_exitted( executing ); |
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| 152 | |
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| 153 | _Internal_error_Occurred( |
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| 154 | INTERNAL_ERROR_CORE, |
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| 155 | TRUE, |
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| 156 | INTERNAL_ERROR_THREAD_EXITTED |
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| 157 | ); |
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| 158 | } |
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