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) 1989-1998. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * Copyright assigned to U.S. Government, 1994. |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in found in the file LICENSE in this distribution or at |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #include <rtems/system.h> |
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17 | #include <rtems/score/apiext.h> |
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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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24 | #include <rtems/score/sysstate.h> |
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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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29 | |
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30 | /*PAGE |
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31 | * |
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32 | * _Thread_Initialize |
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33 | * |
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34 | * XXX |
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35 | */ |
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36 | |
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37 | boolean _Thread_Initialize( |
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38 | Objects_Information *information, |
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39 | Thread_Control *the_thread, |
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40 | void *stack_area, |
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41 | unsigned32 stack_size, |
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42 | boolean is_fp, |
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43 | Priority_Control priority, |
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44 | boolean is_preemptible, |
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45 | Thread_CPU_budget_algorithms budget_algorithm, |
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46 | Thread_CPU_budget_algorithm_callout budget_callout, |
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47 | unsigned32 isr_level, |
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48 | Objects_Name name |
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49 | ) |
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50 | { |
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51 | unsigned32 actual_stack_size = 0; |
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52 | void *stack = NULL; |
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53 | void *fp_area; |
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54 | void *extensions_area; |
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55 | |
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56 | /* |
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57 | * Initialize the Ada self pointer |
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58 | */ |
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59 | |
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60 | the_thread->rtems_ada_self = NULL; |
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61 | |
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62 | /* |
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63 | * Allocate and Initialize the stack for this thread. |
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64 | */ |
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65 | |
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66 | |
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67 | if ( !stack_area ) { |
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68 | if ( !_Stack_Is_enough( stack_size ) ) |
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69 | actual_stack_size = STACK_MINIMUM_SIZE; |
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70 | else |
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71 | actual_stack_size = stack_size; |
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72 | |
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73 | actual_stack_size = _Thread_Stack_Allocate( the_thread, actual_stack_size ); |
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74 | |
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75 | if ( !actual_stack_size ) |
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76 | return FALSE; /* stack allocation failed */ |
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77 | |
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78 | stack = the_thread->Start.stack; |
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79 | the_thread->Start.core_allocated_stack = TRUE; |
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80 | } else { |
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81 | stack = stack_area; |
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82 | actual_stack_size = stack_size; |
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83 | the_thread->Start.core_allocated_stack = FALSE; |
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84 | } |
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85 | |
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86 | _Stack_Initialize( |
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87 | &the_thread->Start.Initial_stack, |
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88 | stack, |
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89 | actual_stack_size |
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90 | ); |
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91 | |
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92 | /* |
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93 | * Allocate the floating point area for this thread |
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94 | */ |
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95 | |
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96 | if ( is_fp ) { |
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97 | |
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98 | fp_area = _Workspace_Allocate( CONTEXT_FP_SIZE ); |
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99 | if ( !fp_area ) { |
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100 | _Thread_Stack_Free( the_thread ); |
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101 | return FALSE; |
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102 | } |
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103 | fp_area = _Context_Fp_start( fp_area, 0 ); |
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104 | |
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105 | } else |
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106 | fp_area = NULL; |
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107 | |
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108 | the_thread->fp_context = fp_area; |
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109 | the_thread->Start.fp_context = fp_area; |
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110 | |
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111 | /* |
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112 | * Allocate the extensions area for this thread |
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113 | */ |
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114 | |
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115 | if ( _Thread_Maximum_extensions ) { |
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116 | extensions_area = _Workspace_Allocate( |
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117 | (_Thread_Maximum_extensions + 1) * sizeof( void * ) |
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118 | ); |
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119 | |
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120 | if ( !extensions_area ) { |
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121 | if ( fp_area ) |
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122 | (void) _Workspace_Free( fp_area ); |
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123 | |
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124 | _Thread_Stack_Free( the_thread ); |
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125 | |
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126 | return FALSE; |
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127 | } |
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128 | } else |
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129 | extensions_area = NULL; |
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130 | |
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131 | the_thread->extensions = (void **) extensions_area; |
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132 | |
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133 | /* |
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134 | * General initialization |
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135 | */ |
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136 | |
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137 | the_thread->Start.is_preemptible = is_preemptible; |
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138 | the_thread->Start.budget_algorithm = budget_algorithm; |
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139 | the_thread->Start.budget_callout = budget_callout; |
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140 | |
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141 | switch ( budget_algorithm ) { |
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142 | case THREAD_CPU_BUDGET_ALGORITHM_NONE: |
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143 | case THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE: |
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144 | break; |
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145 | case THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE: |
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146 | the_thread->cpu_time_budget = _Thread_Ticks_per_timeslice; |
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147 | break; |
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148 | case THREAD_CPU_BUDGET_ALGORITHM_CALLOUT: |
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149 | break; |
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150 | } |
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151 | |
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152 | the_thread->Start.isr_level = isr_level; |
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153 | |
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154 | the_thread->current_state = STATES_DORMANT; |
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155 | the_thread->resource_count = 0; |
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156 | the_thread->suspend_count = 0; |
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157 | the_thread->real_priority = priority; |
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158 | the_thread->Start.initial_priority = priority; |
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159 | the_thread->ticks_executed = 0; |
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160 | |
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161 | _Thread_Set_priority( the_thread, priority ); |
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162 | |
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163 | /* |
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164 | * Open the object |
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165 | */ |
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166 | |
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167 | _Objects_Open( information, &the_thread->Object, name ); |
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168 | |
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169 | /* |
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170 | * Invoke create extensions |
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171 | */ |
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172 | |
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173 | if ( !_User_extensions_Thread_create( the_thread ) ) { |
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174 | |
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175 | if ( extensions_area ) |
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176 | (void) _Workspace_Free( extensions_area ); |
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177 | |
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178 | if ( fp_area ) |
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179 | (void) _Workspace_Free( fp_area ); |
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180 | |
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181 | _Thread_Stack_Free( the_thread ); |
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182 | |
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183 | return FALSE; |
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184 | } |
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185 | |
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186 | return TRUE; |
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187 | |
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188 | } |
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