1 | /** |
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2 | * @file rtems/rtems/sem.h |
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3 | * |
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4 | * This include file contains all the constants and structures associated |
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5 | * with the Semaphore Manager. This manager utilizes standard Dijkstra |
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6 | * counting semaphores to provide synchronization and mutual exclusion |
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7 | * capabilities. |
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8 | * |
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9 | * Directives provided are: |
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10 | * |
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11 | * - create a semaphore |
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12 | * - get an ID of a semaphore |
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13 | * - delete a semaphore |
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14 | * - acquire a semaphore |
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15 | * - release a semaphore |
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16 | */ |
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17 | |
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18 | /* COPYRIGHT (c) 1989-2008. |
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19 | * On-Line Applications Research Corporation (OAR). |
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20 | * |
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21 | * The license and distribution terms for this file may be |
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22 | * found in the file LICENSE in this distribution or at |
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23 | * http://www.rtems.com/license/LICENSE. |
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24 | */ |
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25 | |
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26 | #ifndef _RTEMS_RTEMS_SEM_H |
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27 | #define _RTEMS_RTEMS_SEM_H |
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28 | |
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29 | /** |
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30 | * This constant is defined to extern most of the time when using |
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31 | * this header file. However by defining it to nothing, the data |
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32 | * declared in this header file can be instantiated. This is done |
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33 | * in a single per manager file. |
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34 | */ |
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35 | #ifndef RTEMS_SEM_EXTERN |
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36 | #define RTEMS_SEM_EXTERN extern |
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37 | #endif |
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38 | |
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39 | #ifdef __cplusplus |
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40 | extern "C" { |
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41 | #endif |
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42 | |
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43 | #include <rtems/rtems/types.h> |
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44 | #include <rtems/rtems/options.h> |
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45 | #include <rtems/rtems/support.h> |
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46 | #include <rtems/rtems/tasks.h> |
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47 | #include <rtems/rtems/attr.h> |
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48 | #include <rtems/score/coremutex.h> |
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49 | #include <rtems/score/object.h> |
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50 | #include <rtems/score/coresem.h> |
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51 | |
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52 | /** |
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53 | * @defgroup ClassicSem Semaphores |
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54 | * |
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55 | * @ingroup ClassicRTEMS |
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56 | * |
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57 | * This encapsulates functionality related to the Classic API |
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58 | * Semaphore Manager. |
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59 | */ |
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60 | /**@{*/ |
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61 | |
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62 | /** |
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63 | * The following defines the control block used to manage each semaphore. |
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64 | */ |
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65 | typedef struct { |
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66 | /** This field is the object management portion of a Semaphore instance. */ |
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67 | Objects_Control Object; |
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68 | |
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69 | /** |
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70 | * This is the Classic API attribute provided to the create directive. |
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71 | * It is translated into behavioral attributes on the SuperCore Semaphore |
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72 | * or Mutex instance. |
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73 | */ |
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74 | rtems_attribute attribute_set; |
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75 | |
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76 | /** |
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77 | * This contains the memory associated with the SuperCore Semaphore or |
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78 | * Mutex instance that provides the primary functionality of each |
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79 | * Classic API Semaphore instance. The structure used is dependent |
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80 | * on the attributes specified by the user on the create directive. |
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81 | * |
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82 | * @note Only one of these has meaning in a particular Classic API |
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83 | * Semaphore instance. |
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84 | */ |
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85 | union { |
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86 | /** |
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87 | * This is the SuperCore Mutex instance associated with this Classic |
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88 | * API Semaphore instance. |
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89 | */ |
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90 | CORE_mutex_Control mutex; |
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91 | |
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92 | /** |
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93 | * This is the SuperCore Semaphore instance associated with this Classic |
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94 | * API Semaphore instance. |
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95 | */ |
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96 | CORE_semaphore_Control semaphore; |
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97 | } Core_control; |
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98 | } Semaphore_Control; |
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99 | |
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100 | /** |
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101 | * The following defines the information control block used to manage |
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102 | * this class of objects. |
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103 | */ |
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104 | RTEMS_SEM_EXTERN Objects_Information _Semaphore_Information; |
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105 | |
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106 | /** |
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107 | * @brief Semaphore Manager Initialization |
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108 | * |
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109 | * This routine performs the initialization necessary for this manager. |
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110 | */ |
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111 | void _Semaphore_Manager_initialization(void); |
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112 | |
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113 | /** |
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114 | * @brief rtems_semaphore_create |
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115 | * |
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116 | * This routine implements the rtems_semaphore_create directive. The |
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117 | * semaphore will have the name name. The starting count for |
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118 | * the semaphore is count. The attribute_set determines if |
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119 | * the semaphore is global or local and the thread queue |
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120 | * discipline. It returns the id of the created semaphore in ID. |
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121 | */ |
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122 | rtems_status_code rtems_semaphore_create( |
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123 | rtems_name name, |
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124 | uint32_t count, |
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125 | rtems_attribute attribute_set, |
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126 | rtems_task_priority priority_ceiling, |
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127 | rtems_id *id |
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128 | ); |
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129 | |
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130 | /** |
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131 | * @brief RTEMS Semaphore Name to Id |
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132 | * |
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133 | * This routine implements the rtems_semaphore_ident directive. |
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134 | * This directive returns the semaphore ID associated with name. |
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135 | * If more than one semaphore is named name, then the semaphore |
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136 | * to which the ID belongs is arbitrary. node indicates the |
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137 | * extent of the search for the ID of the semaphore named name. |
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138 | * The search can be limited to a particular node or allowed to |
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139 | * encompass all nodes. |
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140 | * |
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141 | * @param[in] name is the user defined semaphore name |
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142 | * @param[in] node is(are) the node(s) to be searched |
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143 | * @param[in] id is the pointer to semaphore id |
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144 | * |
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145 | * @return RTEMS_SUCCESSFUL if successful or error code if unsuccessful and |
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146 | * *id filled in with the semaphore id |
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147 | */ |
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148 | rtems_status_code rtems_semaphore_ident( |
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149 | rtems_name name, |
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150 | uint32_t node, |
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151 | rtems_id *id |
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152 | ); |
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153 | |
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154 | /** |
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155 | * @brief RTEMS Delete Semaphore |
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156 | * |
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157 | * This routine implements the rtems_semaphore_delete directive. The |
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158 | * semaphore indicated by ID is deleted. |
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159 | * |
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160 | * @param[in] id is the semaphore id |
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161 | * |
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162 | * @return This method returns RTEMS_SUCCESSFUL if there was not an |
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163 | * error. Otherwise, a status code is returned indicating the |
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164 | * source of the error. |
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165 | */ |
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166 | rtems_status_code rtems_semaphore_delete( |
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167 | rtems_id id |
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168 | ); |
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169 | |
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170 | /** |
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171 | * @brief rtems_semaphore_obtain |
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172 | * |
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173 | * This routine implements the rtems_semaphore_obtain directive. It |
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174 | * attempts to obtain a unit from the semaphore associated with ID. |
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175 | * If a unit can be allocated, the calling task will return immediately. |
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176 | * If no unit is available, then the task may return immediately or |
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177 | * block waiting for a unit with an optional timeout of timeout |
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178 | * clock ticks. Whether the task blocks or returns immediately |
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179 | * is based on the RTEMS_NO_WAIT option in the option_set. |
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180 | */ |
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181 | rtems_status_code rtems_semaphore_obtain( |
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182 | rtems_id id, |
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183 | rtems_option option_set, |
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184 | rtems_interval timeout |
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185 | ); |
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186 | |
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187 | /** |
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188 | * @brief rtems_semaphore_release |
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189 | * |
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190 | * This routine implements the rtems_semaphore_release directive. It |
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191 | * frees a unit to the semaphore associated with ID. If a task was |
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192 | * blocked waiting for a unit from this semaphore, then that task will |
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193 | * be readied and the unit given to that task. Otherwise, the unit |
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194 | * will be returned to the semaphore. |
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195 | */ |
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196 | rtems_status_code rtems_semaphore_release( |
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197 | rtems_id id |
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198 | ); |
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199 | |
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200 | /** |
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201 | * @brief RTEMS Semaphore Flush |
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202 | * |
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203 | * DESCRIPTION: |
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204 | * This package is the implementation of the flush directive |
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205 | * of the Semaphore Manager. |
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206 | * |
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207 | * This directive allows a thread to flush the threads |
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208 | * pending on the semaphore. |
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209 | * |
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210 | * @param[in] id is the semaphore id |
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211 | * |
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212 | * @return RTEMS_SUCCESSFUL if successful or error code if unsuccessful |
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213 | */ |
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214 | rtems_status_code rtems_semaphore_flush( |
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215 | rtems_id id |
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216 | ); |
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217 | |
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218 | /** |
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219 | * @brief _Semaphore_Seize |
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220 | * |
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221 | * This routine attempts to receive a unit from the_semaphore. |
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222 | * If a unit is available or if the RTEMS_NO_WAIT option is enabled in |
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223 | * option_set, then the routine returns. Otherwise, the calling task |
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224 | * is blocked until a unit becomes available. |
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225 | */ |
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226 | bool _Semaphore_Seize( |
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227 | Semaphore_Control *the_semaphore, |
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228 | uint32_t option_set |
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229 | ); |
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230 | |
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231 | /** |
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232 | * @brief Semaphore Translate Core Mutex Return Code |
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233 | * |
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234 | * This function returns a RTEMS status code based on the mutex |
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235 | * status code specified. |
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236 | * |
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237 | * @param[in] the_mutex_status is the mutex status code to translate |
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238 | * |
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239 | * @return translated RTEMS status code |
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240 | */ |
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241 | rtems_status_code _Semaphore_Translate_core_mutex_return_code ( |
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242 | uint32_t the_mutex_status |
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243 | ); |
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244 | |
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245 | /** |
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246 | * @brief Semaphore Translate Core Semaphore Return Code |
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247 | * |
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248 | * This function returns a RTEMS status code based on the semaphore |
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249 | * status code specified. |
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250 | * |
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251 | * @param[in] status is the semaphore status code to translate |
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252 | * |
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253 | * @return translated RTEMS status code |
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254 | */ |
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255 | rtems_status_code _Semaphore_Translate_core_semaphore_return_code ( |
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256 | uint32_t the_mutex_status |
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257 | ); |
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258 | |
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259 | #ifndef __RTEMS_APPLICATION__ |
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260 | #include <rtems/rtems/sem.inl> |
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261 | #endif |
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262 | #if defined(RTEMS_MULTIPROCESSING) |
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263 | #include <rtems/rtems/semmp.h> |
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264 | #endif |
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265 | |
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266 | #ifdef __cplusplus |
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267 | } |
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268 | #endif |
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269 | |
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270 | /**@}*/ |
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271 | |
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272 | #endif |
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273 | /* end of include file */ |
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