1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup ScoreUserExt |
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5 | * |
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6 | * @brief User Extension Handler API. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * COPYRIGHT (c) 1989-2009. |
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11 | * On-Line Applications Research Corporation (OAR). |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.com/license/LICENSE. |
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16 | */ |
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17 | |
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18 | #ifndef _RTEMS_SCORE_USEREXT_H |
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19 | #define _RTEMS_SCORE_USEREXT_H |
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20 | |
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21 | #include <rtems/score/interr.h> |
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22 | #include <rtems/score/chain.h> |
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23 | #include <rtems/score/thread.h> |
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24 | |
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25 | #ifdef __cplusplus |
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26 | extern "C" { |
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27 | #endif |
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28 | |
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29 | typedef void User_extensions_routine RTEMS_COMPILER_DEPRECATED_ATTRIBUTE; |
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30 | |
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31 | /** |
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32 | * @defgroup ScoreUserExt User Extension Handler |
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33 | * |
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34 | * @ingroup Score |
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35 | * |
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36 | * @brief The User Extension Handler provides invocation of application |
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37 | * dependent routines at critical points in the life of each thread and the |
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38 | * system as a whole. |
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39 | * |
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40 | * @{ |
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41 | */ |
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42 | |
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43 | /** |
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44 | * @brief Task create extension. |
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45 | * |
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46 | * It corresponds to _Thread_Initialize() (used by the rtems_task_create() |
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47 | * directive). The first parameter points to the currently executing thread |
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48 | * which created the new thread. The second parameter points to the created |
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49 | * thread. |
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50 | * |
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51 | * It is invoked after the new thread has been completely initialized, but |
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52 | * before it is placed on a ready chain. |
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53 | * |
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54 | * Thread dispatching may be disabled. This depends on the context of the |
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55 | * _Thread_Initialize() call. Thread dispatch is disabled during the creation |
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56 | * of the idle thread and the initialization threads. It can be considered as |
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57 | * an invalid API usage, if the application calls _Thread_Initialize() with |
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58 | * disabled thread dispatching. Disabled thread dispatching is different from |
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59 | * disabled preemption. |
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60 | * |
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61 | * It can be assumed that the executing thread locked the allocator mutex. |
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62 | * The only exception is the creation of the idle thread. In this case the |
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63 | * allocator mutex is not locked. Since the allocator mutex is non-recursive, |
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64 | * it is prohibited to call the normal memory allocation routines. It is |
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65 | * possible to use internal rountines like _Workspace_Allocate() or |
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66 | * _Heap_Allocate() for heaps which are protected by the allocator mutex. |
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67 | * |
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68 | * @retval true The thread create extension was successful. |
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69 | * @retval false A thread create user extension will frequently attempt to |
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70 | * allocate resources. If this allocation fails, then the extension should |
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71 | * return @a false and the entire thread create operation will fail. |
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72 | */ |
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73 | typedef bool ( *User_extensions_thread_create_extension )( |
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74 | Thread_Control *, |
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75 | Thread_Control * |
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76 | ); |
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77 | |
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78 | /** |
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79 | * @brief Task delete extension. |
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80 | * |
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81 | * It corresponds to _Thread_Close() (used by the rtems_task_delete() |
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82 | * directive). The first parameter points to the currently executing thread |
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83 | * which deleted the thread. The second parameter points to the deleted |
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84 | * thread. |
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85 | * |
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86 | * It is invoked before all resources of the thread are deleted. |
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87 | * |
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88 | * Thread dispatching is enabled. The executing thread locked the allocator |
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89 | * mutex. |
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90 | */ |
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91 | typedef void( *User_extensions_thread_delete_extension )( |
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92 | Thread_Control *, |
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93 | Thread_Control * |
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94 | ); |
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95 | |
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96 | /** |
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97 | * @brief Task start extension. |
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98 | * |
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99 | * It corresponds to _Thread_Start() (used by the rtems_task_start() |
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100 | * directive). The first parameter points to the currently executing thread |
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101 | * which started the thread. The second parameter points to the started |
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102 | * thread. |
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103 | * |
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104 | * It is invoked after the environment of the thread has been loaded and the |
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105 | * thread has been made ready. |
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106 | * |
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107 | * Thread dispatching is disabled. The executing thread is not the holder of |
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108 | * the allocator mutex. |
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109 | */ |
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110 | typedef void( *User_extensions_thread_start_extension )( |
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111 | Thread_Control *, |
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112 | Thread_Control * |
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113 | ); |
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114 | |
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115 | /** |
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116 | * @brief Task restart extension. |
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117 | * |
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118 | * It corresponds to _Thread_Restart() (used by the rtems_task_restart() |
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119 | * directive). The first parameter points to the currently executing thread |
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120 | * which restarted the thread. The second parameter points to the restarted |
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121 | * thread. |
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122 | * |
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123 | * It is invoked after the environment of the thread has been loaded and the |
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124 | * thread has been made ready. |
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125 | * |
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126 | * Thread dispatching is disabled. The executing thread is not the holder of |
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127 | * the allocator mutex. |
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128 | */ |
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129 | typedef void( *User_extensions_thread_restart_extension )( |
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130 | Thread_Control *, |
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131 | Thread_Control * |
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132 | ); |
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133 | |
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134 | /** |
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135 | * @brief Task switch extension. |
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136 | * |
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137 | * It corresponds to _Thread_Dispatch(). The first parameter points to the |
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138 | * currently executing thread. The second parameter points to the heir thread. |
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139 | * |
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140 | * It is invoked before the context switch from the executing to the heir |
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141 | * thread. |
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142 | * |
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143 | * Thread dispatching is disabled. The state of the allocator mutex is |
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144 | * arbitrary. |
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145 | * |
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146 | * The context switches initiated through _Thread_Start_multitasking() and |
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147 | * _Thread_Stop_multitasking() are not covered by this extension. The |
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148 | * executing thread may run with a minimal setup, for example with a freed task |
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149 | * stack. |
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150 | */ |
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151 | typedef void( *User_extensions_thread_switch_extension )( |
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152 | Thread_Control *, |
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153 | Thread_Control * |
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154 | ); |
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155 | |
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156 | /** |
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157 | * @brief Task begin extension. |
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158 | * |
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159 | * It corresponds to _Thread_Handler(). The first parameter points to the |
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160 | * currently executing thread which begins now execution. |
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161 | * |
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162 | * Thread dispatching is disabled. The executing thread is not the holder of |
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163 | * the allocator mutex. |
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164 | */ |
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165 | typedef void( *User_extensions_thread_begin_extension )( |
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166 | Thread_Control * |
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167 | ); |
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168 | |
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169 | /** |
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170 | * @brief Task exitted extension. |
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171 | * |
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172 | * It corresponds to _Thread_Handler(). The first parameter points to the |
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173 | * currently executing thread which exitted before. |
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174 | * |
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175 | * Thread dispatching is disabled. The state of the allocator mutex is |
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176 | * arbitrary. |
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177 | */ |
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178 | typedef void( *User_extensions_thread_exitted_extension )( |
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179 | Thread_Control * |
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180 | ); |
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181 | |
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182 | /** |
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183 | * @brief Fatal error extension. |
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184 | * |
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185 | * It corresponds to _Internal_error_Occurred() (used by the |
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186 | * rtems_fatal_error_occurred() directive). The first parameter contains the |
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187 | * error source. The second parameter indicates if it was an internal error. |
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188 | * The third parameter contains the error code. |
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189 | * |
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190 | * This extension should not call any RTEMS directives. |
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191 | */ |
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192 | typedef void( *User_extensions_fatal_extension )( |
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193 | Internal_errors_Source, |
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194 | bool, |
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195 | Internal_errors_t |
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196 | ); |
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197 | |
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198 | /** |
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199 | * @brief User extension table. |
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200 | */ |
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201 | typedef struct { |
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202 | User_extensions_thread_create_extension thread_create; |
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203 | User_extensions_thread_start_extension thread_start; |
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204 | User_extensions_thread_restart_extension thread_restart; |
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205 | User_extensions_thread_delete_extension thread_delete; |
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206 | User_extensions_thread_switch_extension thread_switch; |
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207 | User_extensions_thread_begin_extension thread_begin; |
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208 | User_extensions_thread_exitted_extension thread_exitted; |
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209 | User_extensions_fatal_extension fatal; |
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210 | } User_extensions_Table; |
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211 | |
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212 | /** |
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213 | * @brief Manages the switch callouts. |
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214 | * |
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215 | * They are managed separately from other extensions for performance reasons. |
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216 | */ |
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217 | typedef struct { |
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218 | Chain_Node Node; |
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219 | User_extensions_thread_switch_extension thread_switch; |
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220 | } User_extensions_Switch_control; |
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221 | |
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222 | /** |
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223 | * @brief Manages each user extension set. |
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224 | * |
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225 | * The switch control is part of the extensions control even if not used due to |
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226 | * the extension not having a switch handler. |
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227 | */ |
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228 | typedef struct { |
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229 | Chain_Node Node; |
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230 | User_extensions_Switch_control Switch; |
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231 | User_extensions_Table Callouts; |
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232 | } User_extensions_Control; |
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233 | |
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234 | /** |
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235 | * @brief List of active extensions. |
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236 | */ |
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237 | SCORE_EXTERN Chain_Control _User_extensions_List; |
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238 | |
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239 | /** |
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240 | * @brief List of active task switch extensions. |
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241 | */ |
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242 | SCORE_EXTERN Chain_Control _User_extensions_Switches_list; |
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243 | |
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244 | /** |
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245 | * @name Extension Maintainance |
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246 | * |
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247 | * @{ |
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248 | */ |
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249 | |
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250 | void _User_extensions_Handler_initialization( void ); |
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251 | |
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252 | void _User_extensions_Add_set( |
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253 | User_extensions_Control *extension |
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254 | ); |
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255 | |
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256 | RTEMS_INLINE_ROUTINE void _User_extensions_Add_API_set( |
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257 | User_extensions_Control *extension |
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258 | ) |
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259 | { |
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260 | _User_extensions_Add_set( extension ); |
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261 | } |
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262 | |
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263 | RTEMS_INLINE_ROUTINE void _User_extensions_Add_set_with_table( |
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264 | User_extensions_Control *extension, |
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265 | const User_extensions_Table *extension_table |
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266 | ) |
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267 | { |
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268 | extension->Callouts = *extension_table; |
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269 | |
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270 | _User_extensions_Add_set( extension ); |
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271 | } |
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272 | |
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273 | void _User_extensions_Remove_set( |
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274 | User_extensions_Control *extension |
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275 | ); |
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276 | |
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277 | /** @} */ |
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278 | |
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279 | /** |
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280 | * @name Extension Callout Dispatcher |
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281 | * |
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282 | * @{ |
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283 | */ |
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284 | |
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285 | bool _User_extensions_Thread_create( |
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286 | Thread_Control *created |
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287 | ); |
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288 | |
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289 | void _User_extensions_Thread_delete( |
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290 | Thread_Control *deleted |
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291 | ); |
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292 | |
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293 | void _User_extensions_Thread_start( |
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294 | Thread_Control *started |
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295 | ); |
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296 | |
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297 | void _User_extensions_Thread_restart( |
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298 | Thread_Control *restarted |
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299 | ); |
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300 | |
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301 | void _User_extensions_Thread_begin( |
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302 | Thread_Control *executing |
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303 | ); |
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304 | |
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305 | void _User_extensions_Thread_switch( |
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306 | Thread_Control *executing, |
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307 | Thread_Control *heir |
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308 | ); |
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309 | |
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310 | void _User_extensions_Thread_exitted( |
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311 | Thread_Control *executing |
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312 | ); |
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313 | |
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314 | void _User_extensions_Fatal( |
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315 | Internal_errors_Source source, |
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316 | bool is_internal, |
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317 | Internal_errors_t error |
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318 | ); |
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319 | |
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320 | /** @} */ |
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321 | |
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322 | /** @} */ |
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323 | |
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324 | #ifdef __cplusplus |
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325 | } |
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326 | #endif |
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327 | |
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328 | #endif |
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329 | /* end of include file */ |
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