[05df0a8] | 1 | /* |
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| 2 | * Thread Handler |
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| 3 | * |
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| 4 | * |
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[5088d97] | 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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[bdffb59] | 31 | #include <rtems/score/watchdog.h> |
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[05df0a8] | 32 | #include <rtems/score/wkspace.h> |
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| 33 | |
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| 34 | /*PAGE |
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| 35 | * |
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| 36 | * _Thread_Initialize |
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| 37 | * |
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[0cb7cb9] | 38 | * This routine initializes the specified the thread. It allocates |
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| 39 | * all memory associated with this thread. It completes by adding |
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| 40 | * the thread to the local object table so operations on this |
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| 41 | * thread id are allowed. |
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[05df0a8] | 42 | */ |
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| 43 | |
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| 44 | boolean _Thread_Initialize( |
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| 45 | Objects_Information *information, |
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| 46 | Thread_Control *the_thread, |
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| 47 | void *stack_area, |
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[728a0bd3] | 48 | size_t stack_size, |
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[05df0a8] | 49 | boolean is_fp, |
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| 50 | Priority_Control priority, |
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| 51 | boolean is_preemptible, |
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| 52 | Thread_CPU_budget_algorithms budget_algorithm, |
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| 53 | Thread_CPU_budget_algorithm_callout budget_callout, |
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[3127180] | 54 | uint32_t isr_level, |
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[05df0a8] | 55 | Objects_Name name |
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| 56 | ) |
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| 57 | { |
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[728a0bd3] | 58 | size_t actual_stack_size = 0; |
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[05df0a8] | 59 | void *stack = NULL; |
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[ac5c8c7] | 60 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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[05df0a8] | 61 | void *fp_area; |
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[ac5c8c7] | 62 | #endif |
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[05df0a8] | 63 | void *extensions_area; |
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[5088d97] | 64 | boolean extension_status; |
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[05df0a8] | 65 | |
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| 66 | /* |
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| 67 | * Initialize the Ada self pointer |
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| 68 | */ |
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| 69 | |
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| 70 | the_thread->rtems_ada_self = NULL; |
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| 71 | |
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| 72 | /* |
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| 73 | * Allocate and Initialize the stack for this thread. |
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| 74 | */ |
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| 75 | |
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| 76 | |
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| 77 | if ( !stack_area ) { |
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[ecf0f4c] | 78 | |
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| 79 | actual_stack_size = _Stack_Ensure_minimum( stack_size ); |
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[05df0a8] | 80 | |
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| 81 | actual_stack_size = _Thread_Stack_Allocate( the_thread, actual_stack_size ); |
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[05279b84] | 82 | |
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[8a4a349e] | 83 | if ( !actual_stack_size || actual_stack_size < stack_size ) |
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[05df0a8] | 84 | return FALSE; /* stack allocation failed */ |
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| 85 | |
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| 86 | stack = the_thread->Start.stack; |
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| 87 | the_thread->Start.core_allocated_stack = TRUE; |
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| 88 | } else { |
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| 89 | stack = stack_area; |
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| 90 | actual_stack_size = stack_size; |
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| 91 | the_thread->Start.core_allocated_stack = FALSE; |
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| 92 | } |
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| 93 | |
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| 94 | _Stack_Initialize( |
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| 95 | &the_thread->Start.Initial_stack, |
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| 96 | stack, |
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| 97 | actual_stack_size |
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| 98 | ); |
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| 99 | |
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| 100 | /* |
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| 101 | * Allocate the floating point area for this thread |
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| 102 | */ |
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[05279b84] | 103 | |
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[ca7858bb] | 104 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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[05df0a8] | 105 | if ( is_fp ) { |
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| 106 | |
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| 107 | fp_area = _Workspace_Allocate( CONTEXT_FP_SIZE ); |
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| 108 | if ( !fp_area ) { |
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| 109 | _Thread_Stack_Free( the_thread ); |
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| 110 | return FALSE; |
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| 111 | } |
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| 112 | fp_area = _Context_Fp_start( fp_area, 0 ); |
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| 113 | |
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| 114 | } else |
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| 115 | fp_area = NULL; |
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| 116 | |
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| 117 | the_thread->fp_context = fp_area; |
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| 118 | the_thread->Start.fp_context = fp_area; |
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[ca7858bb] | 119 | #endif |
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[05df0a8] | 120 | |
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[bdffb59] | 121 | /* |
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| 122 | * Initialize the thread timer |
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| 123 | */ |
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| 124 | _Watchdog_Initialize( &the_thread->Timer, NULL, 0, NULL ); |
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| 125 | |
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[fd84982] | 126 | #ifdef __STRICT_ORDER_MUTEX__ |
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| 127 | /*Initialize the head of chain of mutex */ |
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| 128 | _Chain_Initialize_empty(&the_thread->lock_mutex); |
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| 129 | #endif |
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| 130 | |
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[0df8293e] | 131 | /* |
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| 132 | * Clear the libc reent hook. |
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| 133 | */ |
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[05279b84] | 134 | |
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[0df8293e] | 135 | the_thread->libc_reent = NULL; |
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[05279b84] | 136 | |
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[05df0a8] | 137 | /* |
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| 138 | * Allocate the extensions area for this thread |
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| 139 | */ |
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| 140 | |
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| 141 | if ( _Thread_Maximum_extensions ) { |
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| 142 | extensions_area = _Workspace_Allocate( |
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| 143 | (_Thread_Maximum_extensions + 1) * sizeof( void * ) |
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| 144 | ); |
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| 145 | |
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| 146 | if ( !extensions_area ) { |
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[81f6e8cc] | 147 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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[05df0a8] | 148 | if ( fp_area ) |
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| 149 | (void) _Workspace_Free( fp_area ); |
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[81f6e8cc] | 150 | #endif |
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[05df0a8] | 151 | |
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| 152 | _Thread_Stack_Free( the_thread ); |
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| 153 | |
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| 154 | return FALSE; |
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| 155 | } |
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[a0ed4ed] | 156 | } else |
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[05df0a8] | 157 | extensions_area = NULL; |
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[05279b84] | 158 | |
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[05df0a8] | 159 | the_thread->extensions = (void **) extensions_area; |
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| 160 | |
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[f918e74] | 161 | /* |
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| 162 | * Clear the extensions area so extension users can determine |
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| 163 | * if they are linked to the thread. An extension user may |
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| 164 | * create the extension long after tasks have been created |
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| 165 | * so they cannot rely on the thread create user extension |
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| 166 | * call. |
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| 167 | */ |
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| 168 | |
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| 169 | if ( the_thread->extensions ) { |
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| 170 | int i; |
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| 171 | for ( i = 0; i < (_Thread_Maximum_extensions + 1); i++ ) |
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| 172 | the_thread->extensions[i] = NULL; |
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| 173 | } |
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| 174 | |
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[05df0a8] | 175 | /* |
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| 176 | * General initialization |
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| 177 | */ |
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| 178 | |
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| 179 | the_thread->Start.is_preemptible = is_preemptible; |
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| 180 | the_thread->Start.budget_algorithm = budget_algorithm; |
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| 181 | the_thread->Start.budget_callout = budget_callout; |
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[f94e76ba] | 182 | |
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| 183 | switch ( budget_algorithm ) { |
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| 184 | case THREAD_CPU_BUDGET_ALGORITHM_NONE: |
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| 185 | case THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE: |
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| 186 | break; |
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| 187 | case THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE: |
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| 188 | the_thread->cpu_time_budget = _Thread_Ticks_per_timeslice; |
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| 189 | break; |
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| 190 | case THREAD_CPU_BUDGET_ALGORITHM_CALLOUT: |
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| 191 | break; |
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| 192 | } |
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| 193 | |
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[c3330a8] | 194 | the_thread->Start.isr_level = isr_level; |
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| 195 | |
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| 196 | the_thread->current_state = STATES_DORMANT; |
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| 197 | the_thread->Wait.queue = NULL; |
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| 198 | the_thread->resource_count = 0; |
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| 199 | the_thread->suspend_count = 0; |
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| 200 | the_thread->real_priority = priority; |
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| 201 | the_thread->Start.initial_priority = priority; |
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| 202 | _Thread_Set_priority( the_thread, priority ); |
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[05df0a8] | 203 | |
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[c3330a8] | 204 | /* |
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| 205 | * Initialize the CPU usage statistics |
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| 206 | */ |
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[05279b84] | 207 | |
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[c3330a8] | 208 | #ifdef RTEMS_ENABLE_NANOSECOND_CPU_USAGE_STATISTICS |
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| 209 | the_thread->cpu_time_used.tv_sec = 0; |
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| 210 | the_thread->cpu_time_used.tv_nsec = 0; |
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| 211 | #else |
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[5fa5185] | 212 | the_thread->cpu_time_used = 0; |
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[c3330a8] | 213 | #endif |
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[05df0a8] | 214 | |
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| 215 | /* |
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| 216 | * Open the object |
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| 217 | */ |
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| 218 | |
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| 219 | _Objects_Open( information, &the_thread->Object, name ); |
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| 220 | |
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| 221 | /* |
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[5088d97] | 222 | * We assume the Allocator Mutex is locked and dispatching is |
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| 223 | * enabled when we get here. We want to be able to run the |
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| 224 | * user extensions with dispatching enabled. The Allocator |
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| 225 | * Mutex provides sufficient protection to let the user extensions |
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| 226 | * run safely. |
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[05df0a8] | 227 | */ |
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[5088d97] | 228 | extension_status = _User_extensions_Thread_create( the_thread ); |
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[05df0a8] | 229 | |
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[5088d97] | 230 | if ( !extension_status ) { |
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[05df0a8] | 231 | |
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| 232 | if ( extensions_area ) |
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| 233 | (void) _Workspace_Free( extensions_area ); |
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| 234 | |
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[81f6e8cc] | 235 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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[05df0a8] | 236 | if ( fp_area ) |
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| 237 | (void) _Workspace_Free( fp_area ); |
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[81f6e8cc] | 238 | #endif |
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[05df0a8] | 239 | |
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| 240 | _Thread_Stack_Free( the_thread ); |
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| 241 | |
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| 242 | return FALSE; |
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| 243 | } |
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| 244 | |
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| 245 | return TRUE; |
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[05279b84] | 246 | |
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[05df0a8] | 247 | } |
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