1 | /* |
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2 | * RTEMS Task Manager |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989-1999. |
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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 the file LICENSE in this distribution or at |
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10 | * http://www.rtems.com/license/LICENSE. |
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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 | #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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19 | #include <rtems/system.h> |
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20 | #include <rtems/rtems/status.h> |
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21 | #include <rtems/rtems/support.h> |
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22 | #include <rtems/rtems/modes.h> |
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23 | #include <rtems/score/object.h> |
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24 | #include <rtems/score/stack.h> |
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25 | #include <rtems/score/states.h> |
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26 | #include <rtems/rtems/tasks.h> |
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27 | #include <rtems/score/thread.h> |
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28 | #include <rtems/score/threadq.h> |
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29 | #include <rtems/score/tod.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 | #include <rtems/score/apiext.h> |
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33 | #include <rtems/score/sysstate.h> |
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34 | |
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35 | /*PAGE |
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36 | * |
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37 | * rtems_task_create |
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38 | * |
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39 | * This directive creates a thread by allocating and initializing a |
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40 | * thread control block and a stack. The newly created thread is |
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41 | * placed in the dormant state. |
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42 | * |
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43 | * Input parameters: |
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44 | * name - user defined thread name |
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45 | * initial_priority - thread priority |
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46 | * stack_size - stack size in bytes |
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47 | * initial_modes - initial thread mode |
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48 | * attribute_set - thread attributes |
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49 | * id - pointer to thread id |
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50 | * |
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51 | * Output parameters: |
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52 | * id - thread id |
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53 | * RTEMS_SUCCESSFUL - if successful |
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54 | * error code - if unsuccessful |
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55 | */ |
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56 | |
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57 | rtems_status_code rtems_task_create( |
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58 | rtems_name name, |
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59 | rtems_task_priority initial_priority, |
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60 | size_t stack_size, |
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61 | rtems_mode initial_modes, |
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62 | rtems_attribute attribute_set, |
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63 | Objects_Id *id |
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64 | ) |
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65 | { |
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66 | register Thread_Control *the_thread; |
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67 | boolean is_fp; |
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68 | #if defined(RTEMS_MULTIPROCESSING) |
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69 | Objects_MP_Control *the_global_object = NULL; |
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70 | boolean is_global; |
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71 | #endif |
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72 | boolean status; |
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73 | rtems_attribute the_attribute_set; |
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74 | Priority_Control core_priority; |
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75 | RTEMS_API_Control *api; |
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76 | ASR_Information *asr; |
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77 | |
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78 | |
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79 | if ( !id ) |
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80 | return RTEMS_INVALID_ADDRESS; |
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81 | |
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82 | if ( !rtems_is_name_valid( name ) ) |
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83 | return RTEMS_INVALID_NAME; |
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84 | |
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85 | /* |
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86 | * Core Thread Initialize insures we get the minimum amount of |
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87 | * stack space. |
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88 | */ |
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89 | |
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90 | /* |
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91 | * Fix the attribute set to match the attributes which |
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92 | * this processor (1) requires and (2) is able to support. |
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93 | * First add in the required flags for attribute_set |
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94 | * Typically this might include FP if the platform |
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95 | * or application required all tasks to be fp aware. |
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96 | * Then turn off the requested bits which are not supported. |
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97 | */ |
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98 | |
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99 | the_attribute_set = _Attributes_Set( attribute_set, ATTRIBUTES_REQUIRED ); |
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100 | the_attribute_set = |
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101 | _Attributes_Clear( the_attribute_set, ATTRIBUTES_NOT_SUPPORTED ); |
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102 | |
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103 | if ( _Attributes_Is_floating_point( the_attribute_set ) ) |
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104 | is_fp = TRUE; |
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105 | else |
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106 | is_fp = FALSE; |
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107 | |
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108 | /* |
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109 | * Validate the RTEMS API priority and convert it to the core priority range. |
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110 | */ |
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111 | |
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112 | if ( !_Attributes_Is_system_task( the_attribute_set ) ) { |
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113 | if ( !_RTEMS_tasks_Priority_is_valid( initial_priority ) ) |
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114 | return RTEMS_INVALID_PRIORITY; |
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115 | } |
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116 | |
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117 | core_priority = _RTEMS_tasks_Priority_to_Core( initial_priority ); |
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118 | |
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119 | #if defined(RTEMS_MULTIPROCESSING) |
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120 | if ( _Attributes_Is_global( the_attribute_set ) ) { |
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121 | |
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122 | is_global = TRUE; |
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123 | |
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124 | if ( !_System_state_Is_multiprocessing ) |
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125 | return RTEMS_MP_NOT_CONFIGURED; |
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126 | |
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127 | } else |
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128 | is_global = FALSE; |
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129 | #endif |
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130 | |
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131 | /* |
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132 | * Make sure system is MP if this task is global |
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133 | */ |
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134 | |
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135 | /* |
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136 | * Disable dispatch for protection |
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137 | */ |
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138 | |
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139 | _Thread_Disable_dispatch(); |
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140 | |
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141 | /* |
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142 | * Allocate the thread control block and -- if the task is global -- |
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143 | * allocate a global object control block. |
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144 | * |
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145 | * NOTE: This routine does not use the combined allocate and open |
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146 | * global object routine because this results in a lack of |
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147 | * control over when memory is allocated and can be freed in |
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148 | * the event of an error. |
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149 | */ |
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150 | |
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151 | the_thread = _RTEMS_tasks_Allocate(); |
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152 | |
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153 | if ( !the_thread ) { |
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154 | _Thread_Enable_dispatch(); |
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155 | return RTEMS_TOO_MANY; |
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156 | } |
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157 | |
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158 | #if defined(RTEMS_MULTIPROCESSING) |
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159 | if ( is_global ) { |
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160 | the_global_object = _Objects_MP_Allocate_global_object(); |
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161 | |
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162 | if ( _Objects_MP_Is_null_global_object( the_global_object ) ) { |
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163 | _RTEMS_tasks_Free( the_thread ); |
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164 | _Thread_Enable_dispatch(); |
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165 | return RTEMS_TOO_MANY; |
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166 | } |
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167 | } |
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168 | #endif |
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169 | |
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170 | /* |
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171 | * Initialize the core thread for this task. |
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172 | */ |
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173 | |
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174 | status = _Thread_Initialize( |
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175 | &_RTEMS_tasks_Information, |
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176 | the_thread, |
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177 | NULL, |
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178 | stack_size, |
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179 | is_fp, |
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180 | core_priority, |
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181 | _Modes_Is_preempt(initial_modes) ? TRUE : FALSE, |
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182 | _Modes_Is_timeslice(initial_modes) ? |
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183 | THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE : |
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184 | THREAD_CPU_BUDGET_ALGORITHM_NONE, |
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185 | NULL, /* no budget algorithm callout */ |
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186 | _Modes_Get_interrupt_level(initial_modes), |
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187 | (Objects_Name) name |
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188 | ); |
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189 | |
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190 | if ( !status ) { |
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191 | #if defined(RTEMS_MULTIPROCESSING) |
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192 | if ( is_global ) |
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193 | _Objects_MP_Free_global_object( the_global_object ); |
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194 | #endif |
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195 | _RTEMS_tasks_Free( the_thread ); |
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196 | _Thread_Enable_dispatch(); |
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197 | return RTEMS_UNSATISFIED; |
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198 | } |
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199 | |
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200 | api = the_thread->API_Extensions[ THREAD_API_RTEMS ]; |
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201 | asr = &api->Signal; |
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202 | |
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203 | asr->is_enabled = _Modes_Is_asr_disabled(initial_modes) ? FALSE : TRUE; |
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204 | |
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205 | *id = the_thread->Object.id; |
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206 | |
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207 | #if defined(RTEMS_MULTIPROCESSING) |
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208 | if ( is_global ) { |
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209 | |
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210 | the_thread->is_global = TRUE; |
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211 | |
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212 | _Objects_MP_Open( |
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213 | &_RTEMS_tasks_Information, |
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214 | the_global_object, |
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215 | name, |
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216 | the_thread->Object.id |
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217 | ); |
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218 | |
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219 | _RTEMS_tasks_MP_Send_process_packet( |
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220 | RTEMS_TASKS_MP_ANNOUNCE_CREATE, |
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221 | the_thread->Object.id, |
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222 | name |
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223 | ); |
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224 | |
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225 | } |
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226 | #endif |
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227 | |
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228 | _Thread_Enable_dispatch(); |
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229 | return RTEMS_SUCCESSFUL; |
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230 | } |
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