1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Inlined Routines in the Core Message Handler |
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5 | * |
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6 | * This include file contains the static inline implementation of all |
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7 | * inlined routines in the Core Message Handler. |
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8 | */ |
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9 | |
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10 | /* |
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11 | * COPYRIGHT (c) 1989-2009. |
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12 | * On-Line Applications Research Corporation (OAR). |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #ifndef _RTEMS_SCORE_COREMSGIMPL_H |
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20 | #define _RTEMS_SCORE_COREMSGIMPL_H |
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21 | |
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22 | #include <rtems/score/coremsg.h> |
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23 | #include <rtems/score/chainimpl.h> |
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24 | #include <rtems/score/threaddispatch.h> |
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25 | #include <rtems/score/threadqimpl.h> |
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26 | |
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27 | #include <limits.h> |
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28 | #include <string.h> |
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29 | |
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30 | #ifdef __cplusplus |
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31 | extern "C" { |
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32 | #endif |
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33 | |
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34 | /** |
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35 | * @addtogroup ScoreMessageQueue |
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36 | */ |
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37 | /**@{**/ |
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38 | |
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39 | /** |
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40 | * @brief Used when appending messages onto a message queue. |
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41 | * |
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42 | * This is the priority constant used when appending messages onto |
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43 | * a message queue. |
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44 | */ |
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45 | #define CORE_MESSAGE_QUEUE_SEND_REQUEST INT_MAX |
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46 | |
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47 | /** |
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48 | * @brief Used when prepending messages onto a message queue. |
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49 | * |
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50 | * This is the priority constant used when prepending messages onto |
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51 | * a message queue. |
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52 | */ |
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53 | #define CORE_MESSAGE_QUEUE_URGENT_REQUEST INT_MIN |
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54 | |
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55 | /** |
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56 | * @brief The modes in which a message may be submitted to a message queue. |
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57 | * |
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58 | * The following type details the modes in which a message |
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59 | * may be submitted to a message queue. The message may be posted |
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60 | * in a send or urgent fashion. |
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61 | * |
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62 | * @note All other values are message priorities. Numerically smaller |
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63 | * priorities indicate higher priority messages. |
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64 | */ |
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65 | typedef int CORE_message_queue_Submit_types; |
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66 | |
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67 | /** |
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68 | * @brief The possible set of Core Message Queue handler return statuses. |
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69 | * |
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70 | * This enumerated type defines the possible set of Core Message |
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71 | * Queue handler return statuses. |
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72 | */ |
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73 | typedef enum { |
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74 | /** This value indicates the operation completed sucessfully. */ |
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75 | CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL, |
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76 | /** This value indicates that the message was too large for this queue. */ |
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77 | CORE_MESSAGE_QUEUE_STATUS_INVALID_SIZE, |
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78 | /** This value indicates that there are too many messages pending. */ |
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79 | CORE_MESSAGE_QUEUE_STATUS_TOO_MANY, |
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80 | /** This value indicates that a receive was unsuccessful. */ |
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81 | CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED, |
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82 | /** This value indicates that a blocking send was unsuccessful. */ |
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83 | CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_NOWAIT, |
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84 | /** This value indicates that the message queue being blocked upon |
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85 | * was deleted while the thread was waiting. |
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86 | */ |
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87 | CORE_MESSAGE_QUEUE_STATUS_WAS_DELETED, |
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88 | /** This value indicates that the thread had to timeout while waiting |
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89 | * to receive a message because one did not become available. |
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90 | */ |
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91 | CORE_MESSAGE_QUEUE_STATUS_TIMEOUT, |
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92 | /** This value indicates that a blocking receive was unsuccessful. */ |
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93 | CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_WAIT |
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94 | } CORE_message_queue_Status; |
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95 | |
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96 | /** |
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97 | * @brief Core message queue last status value. |
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98 | * |
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99 | * This is the last status value. |
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100 | */ |
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101 | #define CORE_MESSAGE_QUEUE_STATUS_LAST CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_WAIT |
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102 | |
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103 | /** |
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104 | * @brief Callout provides to support global/multiprocessor operations. |
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105 | * |
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106 | * The following type defines the callout which the API provides |
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107 | * to support global/multiprocessor operations on message_queues. |
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108 | */ |
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109 | typedef void ( *CORE_message_queue_API_mp_support_callout )( |
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110 | Thread_Control *, |
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111 | Objects_Id |
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112 | ); |
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113 | |
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114 | /** |
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115 | * @brief Initialize a message queue. |
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116 | * |
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117 | * This package is the implementation of the CORE Message Queue Handler. |
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118 | * This core object provides task synchronization and communication functions |
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119 | * via messages passed to queue objects. |
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120 | * |
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121 | * This routine initializes @a the_message_queue |
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122 | * based on the parameters passed. |
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123 | * |
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124 | * @param[in] the_message_queue points to the message queue to initialize |
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125 | * @param[in] discipline the blocking discipline |
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126 | * @param[in] maximum_pending_messages is the maximum number of messages |
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127 | * that will be allowed to pend at any given time |
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128 | * @param[in] maximum_message_size is the size of largest message that |
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129 | * may be sent to this message queue instance |
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130 | * |
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131 | * @retval true if the message queue can be initialized. In general, |
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132 | * false will only be returned if memory for the pending |
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133 | * messages cannot be allocated. |
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134 | */ |
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135 | bool _CORE_message_queue_Initialize( |
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136 | CORE_message_queue_Control *the_message_queue, |
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137 | CORE_message_queue_Disciplines discipline, |
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138 | uint32_t maximum_pending_messages, |
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139 | size_t maximum_message_size |
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140 | ); |
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141 | |
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142 | /** |
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143 | * @brief Close a message queue. |
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144 | * |
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145 | * This package is the implementation of the CORE Message Queue Handler. |
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146 | * This core object provides task synchronization and communication functions |
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147 | * via messages passed to queue objects |
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148 | * |
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149 | * This function closes a message by returning all allocated space and |
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150 | * flushing @a the_message_queue's task wait queue. |
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151 | * |
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152 | * @param[in] the_message_queue points to the message queue to close |
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153 | * @param[in] remote_extract_callout is the routine to call for each thread |
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154 | * that is extracted from the set of waiting threads |
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155 | * @param[in] status is the status that each waiting thread will return |
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156 | * from it's blocking service |
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157 | */ |
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158 | void _CORE_message_queue_Close( |
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159 | CORE_message_queue_Control *the_message_queue, |
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160 | Thread_queue_Flush_callout remote_extract_callout, |
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161 | uint32_t status |
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162 | ); |
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163 | |
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164 | /** |
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165 | * @brief Flush pending messages. |
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166 | * |
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167 | * This package is the implementation of the CORE Message Queue Handler. |
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168 | * This core object provides task synchronization and communication functions |
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169 | * via messages passed to queue objects. |
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170 | * |
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171 | * This function flushes @a the_message_queue's pending message queue. The |
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172 | * number of messages flushed from the queue is returned. |
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173 | * |
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174 | * @param[in] the_message_queue points to the message queue to flush |
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175 | * @param[in] lock_context The lock context of the interrupt disable. |
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176 | * |
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177 | * @retval This method returns the number of message pending messages flushed. |
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178 | */ |
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179 | uint32_t _CORE_message_queue_Flush( |
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180 | CORE_message_queue_Control *the_message_queue, |
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181 | ISR_lock_Context *lock_context |
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182 | ); |
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183 | |
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184 | #if defined(FUNCTIONALITY_NOT_CURRENTLY_USED_BY_ANY_API) |
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185 | /** |
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186 | * @brief Flush waiting threads. |
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187 | * |
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188 | * This function flushes the threads which are blocked on |
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189 | * @a the_message_queue's pending message queue. They are |
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190 | * unblocked whether blocked sending or receiving. It returns |
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191 | * the number of messages flushed from the queue. |
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192 | * |
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193 | * @param[in] the_message_queue points to the message queue to flush |
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194 | * @retval number of messages flushed from the queue |
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195 | */ |
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196 | void _CORE_message_queue_Flush_waiting_threads( |
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197 | CORE_message_queue_Control *the_message_queue |
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198 | ); |
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199 | #endif |
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200 | |
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201 | /** |
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202 | * @brief Broadcast a message to the message queue. |
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203 | * |
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204 | * This package is the implementation of the CORE Message Queue Handler. |
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205 | * This core object provides task synchronization and communication functions |
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206 | * via messages passed to queue objects. |
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207 | * |
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208 | * This function sends a message for every thread waiting on the queue and |
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209 | * returns the number of threads made ready by the message. |
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210 | * |
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211 | * @param[in] the_message_queue points to the message queue |
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212 | * @param[in] buffer is the starting address of the message to broadcast |
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213 | * @param[in] size is the size of the message being broadcast |
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214 | * @param[in] id is the RTEMS object Id associated with this message queue. |
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215 | * It is used when unblocking a remote thread. |
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216 | * @param[in] api_message_queue_mp_support is the routine to invoke if |
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217 | * a thread that is unblocked is actually a remote thread. |
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218 | * @param[out] count points to the variable that will contain the |
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219 | * number of tasks that are sent this message |
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220 | * @param[in] lock_context The lock context of the interrupt disable. |
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221 | * @retval @a *count will contain the number of messages sent |
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222 | * @retval indication of the successful completion or reason for failure |
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223 | */ |
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224 | CORE_message_queue_Status _CORE_message_queue_Broadcast( |
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225 | CORE_message_queue_Control *the_message_queue, |
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226 | const void *buffer, |
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227 | size_t size, |
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228 | Objects_Id id, |
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229 | CORE_message_queue_API_mp_support_callout api_message_queue_mp_support, |
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230 | uint32_t *count, |
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231 | ISR_lock_Context *lock_context |
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232 | ); |
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233 | |
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234 | /** |
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235 | * @brief Submit a message to the message queue. |
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236 | * |
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237 | * This routine implements the send and urgent message functions. It |
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238 | * processes a message that is to be submitted to the designated |
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239 | * message queue. The message will either be processed as a |
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240 | * send message which it will be inserted at the rear of the queue |
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241 | * or it will be processed as an urgent message which will be inserted |
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242 | * at the front of the queue. |
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243 | * |
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244 | * @param[in] the_message_queue points to the message queue |
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245 | * @param[in] buffer is the starting address of the message to send |
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246 | * @param[in] size is the size of the message being send |
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247 | * @param[in] id is the RTEMS object Id associated with this message queue. |
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248 | * It is used when unblocking a remote thread. |
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249 | * @param[in] api_message_queue_mp_support is the routine to invoke if |
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250 | * a thread that is unblocked is actually a remote thread. |
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251 | * @param[in] submit_type determines whether the message is prepended, |
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252 | * appended, or enqueued in priority order. |
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253 | * @param[in] wait indicates whether the calling thread is willing to block |
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254 | * if the message queue is full. |
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255 | * @param[in] timeout is the maximum number of clock ticks that the calling |
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256 | * thread is willing to block if the message queue is full. |
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257 | * @param[in] lock_context The lock context of the interrupt disable. |
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258 | * @retval indication of the successful completion or reason for failure |
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259 | */ |
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260 | CORE_message_queue_Status _CORE_message_queue_Submit( |
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261 | CORE_message_queue_Control *the_message_queue, |
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262 | Thread_Control *executing, |
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263 | const void *buffer, |
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264 | size_t size, |
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265 | Objects_Id id, |
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266 | CORE_message_queue_API_mp_support_callout api_message_queue_mp_support, |
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267 | CORE_message_queue_Submit_types submit_type, |
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268 | bool wait, |
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269 | Watchdog_Interval timeout, |
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270 | ISR_lock_Context *lock_context |
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271 | ); |
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272 | |
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273 | /** |
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274 | * @brief Size a message from the message queue. |
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275 | * |
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276 | * This package is the implementation of the CORE Message Queue Handler. |
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277 | * This core object provides task synchronization and communication functions |
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278 | * via messages passed to queue objects. |
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279 | * |
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280 | * This kernel routine dequeues a message, copies the message buffer to |
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281 | * a given destination buffer, and frees the message buffer to the |
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282 | * inactive message pool. The thread will be blocked if wait is true, |
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283 | * otherwise an error will be given to the thread if no messages are available. |
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284 | * |
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285 | * @param[in] the_message_queue points to the message queue |
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286 | * @param[in] id is the RTEMS object Id associated with this message queue. |
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287 | * It is used when unblocking a remote thread. |
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288 | * @param[in] buffer is the starting address of the message buffer to |
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289 | * to be filled in with a message |
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290 | * @param[in] size_p is a pointer to the size of the @a buffer and |
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291 | * indicates the maximum size message that the caller can receive. |
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292 | * @param[in] wait indicates whether the calling thread is willing to block |
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293 | * if the message queue is empty. |
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294 | * @param[in] timeout is the maximum number of clock ticks that the calling |
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295 | * thread is willing to block if the message queue is empty. |
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296 | * @param[in] lock_context The lock context of the interrupt disable. |
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297 | * |
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298 | * @retval indication of the successful completion or reason for failure. |
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299 | * On success, the location pointed to @a size_p will contain the |
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300 | * size of the received message. |
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301 | * |
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302 | * @note Returns message priority via return area in TCB. |
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303 | * |
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304 | * - INTERRUPT LATENCY: |
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305 | * + available |
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306 | * + wait |
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307 | */ |
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308 | void _CORE_message_queue_Seize( |
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309 | CORE_message_queue_Control *the_message_queue, |
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310 | Thread_Control *executing, |
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311 | Objects_Id id, |
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312 | void *buffer, |
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313 | size_t *size_p, |
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314 | bool wait, |
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315 | Watchdog_Interval timeout, |
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316 | ISR_lock_Context *lock_context |
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317 | ); |
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318 | |
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319 | /** |
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320 | * @brief Insert a message into the message queue. |
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321 | * |
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322 | * This kernel routine inserts the specified message into the |
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323 | * message queue. It is assumed that the message has been filled |
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324 | * in before this routine is called. |
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325 | * |
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326 | * @param[in] the_message_queue points to the message queue |
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327 | * @param[in] the_message is the message to enqueue |
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328 | * @param[in] submit_type determines whether the message is prepended, |
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329 | * appended, or enqueued in priority order. |
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330 | * |
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331 | * - INTERRUPT LATENCY: |
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332 | * + insert |
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333 | */ |
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334 | void _CORE_message_queue_Insert_message( |
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335 | CORE_message_queue_Control *the_message_queue, |
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336 | CORE_message_queue_Buffer_control *the_message, |
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337 | CORE_message_queue_Submit_types submit_type |
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338 | ); |
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339 | |
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340 | /** |
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341 | * This routine sends a message to the end of the specified message queue. |
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342 | */ |
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343 | RTEMS_INLINE_ROUTINE CORE_message_queue_Status _CORE_message_queue_Send( |
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344 | CORE_message_queue_Control *the_message_queue, |
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345 | const void *buffer, |
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346 | size_t size, |
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347 | Objects_Id id, |
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348 | CORE_message_queue_API_mp_support_callout api_message_queue_mp_support, |
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349 | bool wait, |
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350 | Watchdog_Interval timeout, |
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351 | ISR_lock_Context *lock_context |
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352 | ) |
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353 | { |
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354 | return _CORE_message_queue_Submit( |
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355 | the_message_queue, |
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356 | _Thread_Executing, |
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357 | buffer, |
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358 | size, |
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359 | id, |
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360 | api_message_queue_mp_support, |
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361 | CORE_MESSAGE_QUEUE_SEND_REQUEST, |
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362 | wait, /* sender may block */ |
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363 | timeout, /* timeout interval */ |
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364 | lock_context |
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365 | ); |
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366 | } |
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367 | |
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368 | /** |
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369 | * This routine sends a message to the front of the specified message queue. |
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370 | */ |
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371 | RTEMS_INLINE_ROUTINE CORE_message_queue_Status _CORE_message_queue_Urgent( |
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372 | CORE_message_queue_Control *the_message_queue, |
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373 | const void *buffer, |
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374 | size_t size, |
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375 | Objects_Id id, |
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376 | CORE_message_queue_API_mp_support_callout api_message_queue_mp_support, |
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377 | bool wait, |
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378 | Watchdog_Interval timeout, |
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379 | ISR_lock_Context *lock_context |
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380 | ) |
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381 | { |
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382 | return _CORE_message_queue_Submit( |
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383 | the_message_queue, |
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384 | _Thread_Executing, |
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385 | buffer, |
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386 | size, |
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387 | id, |
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388 | api_message_queue_mp_support, |
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389 | CORE_MESSAGE_QUEUE_URGENT_REQUEST, |
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390 | wait, /* sender may block */ |
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391 | timeout, /* timeout interval */ |
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392 | lock_context |
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393 | ); |
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394 | } |
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395 | |
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396 | RTEMS_INLINE_ROUTINE void _CORE_message_queue_Acquire( |
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397 | CORE_message_queue_Control *the_message_queue, |
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398 | ISR_lock_Context *lock_context |
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399 | ) |
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400 | { |
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401 | _Thread_queue_Acquire( &the_message_queue->Wait_queue, lock_context ); |
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402 | } |
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403 | |
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404 | RTEMS_INLINE_ROUTINE void _CORE_message_queue_Acquire_critical( |
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405 | CORE_message_queue_Control *the_message_queue, |
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406 | ISR_lock_Context *lock_context |
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407 | ) |
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408 | { |
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409 | _Thread_queue_Acquire_critical( &the_message_queue->Wait_queue, lock_context ); |
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410 | |
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411 | #if defined(RTEMS_MULTIPROCESSING) |
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412 | /* |
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413 | * In case RTEMS_MULTIPROCESSING is enabled, then we have to prevent |
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414 | * deletion of the executing thread after the thread queue operations. |
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415 | */ |
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416 | _Thread_Dispatch_disable(); |
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417 | #endif |
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418 | } |
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419 | |
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420 | RTEMS_INLINE_ROUTINE void _CORE_message_queue_Release( |
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421 | CORE_message_queue_Control *the_message_queue, |
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422 | ISR_lock_Context *lock_context |
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423 | ) |
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424 | { |
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425 | _Thread_queue_Release( &the_message_queue->Wait_queue, lock_context ); |
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426 | #if defined(RTEMS_MULTIPROCESSING) |
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427 | _Thread_Dispatch_enable( _Per_CPU_Get() ); |
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428 | #endif |
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429 | } |
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430 | |
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431 | /** |
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432 | * This routine copies the contents of the source message buffer |
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433 | * to the destination message buffer. |
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434 | */ |
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435 | RTEMS_INLINE_ROUTINE void _CORE_message_queue_Copy_buffer ( |
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436 | const void *source, |
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437 | void *destination, |
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438 | size_t size |
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439 | ) |
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440 | { |
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441 | memcpy(destination, source, size); |
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442 | } |
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443 | |
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444 | /** |
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445 | * This function allocates a message buffer from the inactive |
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446 | * message buffer chain. |
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447 | */ |
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448 | RTEMS_INLINE_ROUTINE CORE_message_queue_Buffer_control * |
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449 | _CORE_message_queue_Allocate_message_buffer ( |
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450 | CORE_message_queue_Control *the_message_queue |
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451 | ) |
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452 | { |
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453 | return (CORE_message_queue_Buffer_control *) |
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454 | _Chain_Get_unprotected( &the_message_queue->Inactive_messages ); |
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455 | } |
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456 | |
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457 | /** |
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458 | * This routine frees a message buffer to the inactive |
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459 | * message buffer chain. |
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460 | */ |
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461 | RTEMS_INLINE_ROUTINE void _CORE_message_queue_Free_message_buffer ( |
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462 | CORE_message_queue_Control *the_message_queue, |
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463 | CORE_message_queue_Buffer_control *the_message |
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464 | ) |
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465 | { |
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466 | _Chain_Append_unprotected( &the_message_queue->Inactive_messages, &the_message->Node ); |
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467 | } |
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468 | |
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469 | /** |
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470 | * This function returns the priority of @a the_message. |
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471 | * |
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472 | * @note It encapsulates the optional behavior that message priority is |
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473 | * disabled if no API requires it. |
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474 | */ |
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475 | RTEMS_INLINE_ROUTINE int _CORE_message_queue_Get_message_priority ( |
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476 | const CORE_message_queue_Buffer_control *the_message |
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477 | ) |
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478 | { |
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479 | #if defined(RTEMS_SCORE_COREMSG_ENABLE_MESSAGE_PRIORITY) |
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480 | return the_message->priority; |
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481 | #else |
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482 | return 0; |
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483 | #endif |
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484 | } |
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485 | |
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486 | /** |
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487 | * This function sets the priority of @a the_message. |
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488 | * |
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489 | * @note It encapsulates the optional behavior that message priority is |
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490 | * disabled if no API requires it. |
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491 | */ |
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492 | RTEMS_INLINE_ROUTINE void _CORE_message_queue_Set_message_priority ( |
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493 | CORE_message_queue_Buffer_control *the_message, |
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494 | int priority |
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495 | ) |
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496 | { |
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497 | #if defined(RTEMS_SCORE_COREMSG_ENABLE_MESSAGE_PRIORITY) |
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498 | the_message->priority = priority; |
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499 | #endif |
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500 | } |
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501 | |
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502 | /** |
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503 | * This function removes the first message from the_message_queue |
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504 | * and returns a pointer to it. |
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505 | */ |
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506 | RTEMS_INLINE_ROUTINE |
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507 | CORE_message_queue_Buffer_control *_CORE_message_queue_Get_pending_message ( |
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508 | CORE_message_queue_Control *the_message_queue |
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509 | ) |
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510 | { |
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511 | return (CORE_message_queue_Buffer_control *) |
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512 | _Chain_Get_unprotected( &the_message_queue->Pending_messages ); |
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513 | } |
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514 | |
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515 | #if defined(RTEMS_SCORE_COREMSG_ENABLE_NOTIFICATION) |
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516 | /** |
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517 | * This function returns true if notification is enabled on this message |
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518 | * queue and false otherwise. |
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519 | */ |
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520 | RTEMS_INLINE_ROUTINE bool _CORE_message_queue_Is_notify_enabled ( |
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521 | CORE_message_queue_Control *the_message_queue |
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522 | ) |
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523 | { |
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524 | return (the_message_queue->notify_handler != NULL); |
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525 | } |
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526 | #endif |
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527 | |
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528 | /** |
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529 | * This routine initializes the notification information for |
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530 | * @a the_message_queue. |
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531 | */ |
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532 | #if defined(RTEMS_SCORE_COREMSG_ENABLE_NOTIFICATION) |
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533 | RTEMS_INLINE_ROUTINE void _CORE_message_queue_Set_notify ( |
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534 | CORE_message_queue_Control *the_message_queue, |
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535 | CORE_message_queue_Notify_Handler the_handler, |
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536 | void *the_argument |
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537 | ) |
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538 | { |
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539 | the_message_queue->notify_handler = the_handler; |
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540 | the_message_queue->notify_argument = the_argument; |
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541 | } |
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542 | #else |
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543 | /* turn it into nothing if not enabled */ |
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544 | #define _CORE_message_queue_Set_notify( \ |
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545 | the_message_queue, the_handler, the_argument ) |
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546 | #endif |
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547 | |
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548 | RTEMS_INLINE_ROUTINE Thread_Control *_CORE_message_queue_Dequeue_receiver( |
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549 | CORE_message_queue_Control *the_message_queue, |
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550 | const void *buffer, |
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551 | size_t size, |
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552 | CORE_message_queue_Submit_types submit_type, |
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553 | ISR_lock_Context *lock_context |
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554 | ) |
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555 | { |
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556 | Thread_Control *the_thread; |
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557 | |
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558 | /* |
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559 | * If there are pending messages, then there can't be threads |
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560 | * waiting for us to send them a message. |
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561 | * |
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562 | * NOTE: This check is critical because threads can block on |
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563 | * send and receive and this ensures that we are broadcasting |
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564 | * the message to threads waiting to receive -- not to send. |
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565 | */ |
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566 | if ( the_message_queue->number_of_pending_messages != 0 ) { |
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567 | return NULL; |
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568 | } |
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569 | |
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570 | /* |
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571 | * There must be no pending messages if there is a thread waiting to |
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572 | * receive a message. |
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573 | */ |
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574 | the_thread = _Thread_queue_First_locked( |
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575 | &the_message_queue->Wait_queue, |
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576 | the_message_queue->operations |
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577 | ); |
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578 | if ( the_thread == NULL ) { |
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579 | return NULL; |
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580 | } |
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581 | |
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582 | *(size_t *) the_thread->Wait.return_argument = size; |
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583 | the_thread->Wait.count = (uint32_t) submit_type; |
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584 | |
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585 | _CORE_message_queue_Copy_buffer( |
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586 | buffer, |
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587 | the_thread->Wait.return_argument_second.mutable_object, |
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588 | size |
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589 | ); |
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590 | |
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591 | _Thread_queue_Extract_critical( |
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592 | &the_message_queue->Wait_queue.Queue, |
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593 | the_message_queue->operations, |
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594 | the_thread, |
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595 | lock_context |
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596 | ); |
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597 | |
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598 | return the_thread; |
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599 | } |
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600 | |
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601 | /** @} */ |
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602 | |
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603 | #ifdef __cplusplus |
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604 | } |
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605 | #endif |
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606 | |
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607 | #endif |
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608 | /* end of include file */ |
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