1 | /* message.h |
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2 | * |
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3 | * This include file contains all the constants and structures associated |
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4 | * with the Message Queue Manager. This manager provides a mechanism for |
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5 | * communication and synchronization between tasks using messages. |
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6 | * |
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7 | * Directives provided are: |
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8 | * |
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9 | * + create a queue |
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10 | * + get ID of a queue |
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11 | * + delete a queue |
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12 | * + put a message at the rear of a queue |
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13 | * + put a message at the front of a queue |
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14 | * + broadcast N messages to a queue |
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15 | * + receive message from a queue |
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16 | * + flush all messages on a queue |
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17 | * |
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18 | * |
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19 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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20 | * On-Line Applications Research Corporation (OAR). |
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21 | * All rights assigned to U.S. Government, 1994. |
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22 | * |
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23 | * This material may be reproduced by or for the U.S. Government pursuant |
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24 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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25 | * notice must appear in all copies of this file and its derivatives. |
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26 | * |
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27 | * $Id$ |
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28 | */ |
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29 | |
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30 | #ifndef __RTEMS_MESSAGE_QUEUE_h |
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31 | #define __RTEMS_MESSAGE_QUEUE_h |
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32 | |
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33 | #ifdef __cplusplus |
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34 | extern "C" { |
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35 | #endif |
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36 | |
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37 | #include <rtems/chain.h> |
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38 | #include <rtems/object.h> |
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39 | #include <rtems/threadq.h> |
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40 | |
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41 | /* |
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42 | * The following defines the data types needed to manipulate |
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43 | * the contents of message buffers. |
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44 | * Since msgs are variable length we just make a ptr to 1. |
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45 | */ |
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46 | |
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47 | typedef struct { |
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48 | unsigned32 size; |
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49 | |
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50 | #ifndef __cplusplus |
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51 | /* NOTE: [0] is gcc specific, |
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52 | * but specifically disallowed by ANSI STD C++ |
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53 | * g++ warns about it, so we #ifdef it out to |
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54 | * get rid of warnings when compiled by g++. |
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55 | */ |
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56 | unsigned32 buffer[0]; |
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57 | #endif |
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58 | |
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59 | } Message_queue_Buffer; |
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60 | |
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61 | /* |
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62 | * The following records define the organization of a message |
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63 | * buffer. |
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64 | */ |
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65 | |
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66 | typedef struct { |
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67 | Chain_Node Node; |
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68 | Message_queue_Buffer Contents; |
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69 | } Message_queue_Buffer_control; |
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70 | |
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71 | /* |
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72 | * The following records define the control block used to manage |
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73 | * each message queue. |
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74 | */ |
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75 | |
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76 | typedef struct { |
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77 | Objects_Control Object; |
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78 | Thread_queue_Control Wait_queue; |
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79 | rtems_attribute attribute_set; |
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80 | unsigned32 maximum_pending_messages; |
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81 | unsigned32 number_of_pending_messages; |
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82 | unsigned32 maximum_message_size; |
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83 | Chain_Control Pending_messages; |
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84 | Message_queue_Buffer *message_buffers; |
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85 | Chain_Control Inactive_messages; |
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86 | } Message_queue_Control; |
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87 | |
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88 | /* |
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89 | * The following defines the information control block used to |
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90 | * manage this class of objects. |
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91 | */ |
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92 | |
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93 | EXTERN Objects_Information _Message_queue_Information; |
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94 | |
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95 | /* |
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96 | * The following enumerated type details the modes in which a message |
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97 | * may be submitted to a message queue. The message may be posted |
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98 | * in a send or urgent fashion. |
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99 | */ |
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100 | |
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101 | typedef enum { |
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102 | MESSAGE_QUEUE_SEND_REQUEST = 0, |
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103 | MESSAGE_QUEUE_URGENT_REQUEST = 1 |
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104 | } Message_queue_Submit_types; |
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105 | |
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106 | /* |
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107 | * _Message_queue_Manager_initialization |
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108 | * |
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109 | * DESCRIPTION: |
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110 | * |
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111 | * This routine performs the initialization necessary for this manager. |
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112 | */ |
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113 | |
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114 | void _Message_queue_Manager_initialization( |
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115 | unsigned32 maximum_message_queues |
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116 | ); |
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117 | |
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118 | /* |
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119 | * rtems_message_queue_create |
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120 | * |
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121 | * DESCRIPTION: |
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122 | * |
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123 | * This routine implements the rtems_message_queue_create directive. The |
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124 | * message queue will have the name name. If the attribute_set indicates |
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125 | * that the message queue is to be limited in the number of messages |
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126 | * that can be outstanding, then count indicates the maximum number of |
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127 | * messages that will be held. It returns the id of the created |
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128 | * message queue in ID. |
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129 | */ |
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130 | |
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131 | rtems_status_code rtems_message_queue_create( |
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132 | Objects_Name name, |
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133 | unsigned32 count, |
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134 | unsigned32 max_message_size, |
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135 | rtems_attribute attribute_set, |
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136 | Objects_Id *id |
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137 | ); |
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138 | |
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139 | /* |
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140 | * rtems_message_queue_ident |
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141 | * |
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142 | * DESCRIPTION: |
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143 | * |
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144 | * This routine implements the rtems_message_queue_ident directive. |
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145 | * This directive returns the message queue ID associated with NAME. |
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146 | * If more than one message queue is named name, then the message |
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147 | * queue to which the ID belongs is arbitrary. node indicates the |
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148 | * extent of the search for the ID of the message queue named name. |
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149 | * The search can be limited to a particular node or allowed to |
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150 | * encompass all nodes. |
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151 | */ |
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152 | |
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153 | rtems_status_code rtems_message_queue_ident( |
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154 | Objects_Name name, |
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155 | unsigned32 node, |
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156 | Objects_Id *id |
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157 | ); |
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158 | |
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159 | /* |
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160 | * rtems_message_queue_delete |
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161 | * |
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162 | * DESCRIPTION: |
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163 | * |
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164 | * This routine implements the rtems_message_queue_delete directive. The |
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165 | * message queue indicated by ID is deleted. |
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166 | */ |
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167 | |
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168 | rtems_status_code rtems_message_queue_delete( |
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169 | Objects_Id id |
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170 | ); |
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171 | |
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172 | /* |
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173 | * rtems_message_queue_send |
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174 | * |
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175 | * DESCRIPTION: |
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176 | * |
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177 | * This routine implements the rtems_message_queue_send directive. |
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178 | * This directive sends the message buffer to the message queue |
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179 | * indicated by ID. If one or more tasks is blocked waiting |
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180 | * to receive a message from this message queue, then one will |
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181 | * receive the message. The task selected to receive the |
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182 | * message is based on the task queue discipline algorithm in |
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183 | * use by this particular message queue. If no tasks are waiting, |
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184 | * then the message buffer will be placed at the rear of the |
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185 | * chain of pending messages for this message queue. |
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186 | */ |
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187 | |
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188 | rtems_status_code rtems_message_queue_send( |
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189 | Objects_Id id, |
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190 | void *buffer, |
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191 | unsigned32 size |
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192 | ); |
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193 | |
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194 | /* |
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195 | * rtems_message_queue_urgent |
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196 | * |
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197 | * DESCRIPTION: |
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198 | * |
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199 | * This routine implements the rtems_message_queue_send directive. |
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200 | * This directive sends the message buffer to the message queue |
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201 | * indicated by ID. If one or more tasks is blocked waiting |
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202 | * to receive a message from this message queue, then one will |
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203 | * receive the message. The task selected to receive the |
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204 | * message is based on the task queue discipline algorithm in |
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205 | * use by this particular message queue. If no tasks are waiting, |
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206 | * then the message buffer will be placed at the rear of the |
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207 | * chain of pending messages for this message queue. |
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208 | */ |
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209 | |
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210 | rtems_status_code rtems_message_queue_urgent( |
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211 | Objects_Id id, |
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212 | void *buffer, |
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213 | unsigned32 size |
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214 | ); |
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215 | |
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216 | /* |
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217 | * rtems_message_queue_broadcast |
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218 | * |
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219 | * DESCRIPTION: |
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220 | * |
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221 | * This routine implements the rtems_message_queue_send directive. |
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222 | * This directive sends the message buffer to the message queue |
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223 | * indicated by ID. If one or more tasks is blocked waiting |
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224 | * to receive a message from this message queue, then one will |
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225 | * receive the message. The task selected to receive the |
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226 | * message is based on the task queue discipline algorithm in |
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227 | * use by this particular message queue. If no tasks are waiting, |
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228 | * then the message buffer will be placed at the rear of the |
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229 | * chain of pending messages for this message queue. |
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230 | */ |
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231 | |
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232 | rtems_status_code rtems_message_queue_broadcast( |
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233 | Objects_Id id, |
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234 | void *buffer, |
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235 | unsigned32 size, |
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236 | unsigned32 *count |
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237 | ); |
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238 | |
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239 | /* |
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240 | * rtems_message_queue_receive |
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241 | * |
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242 | * DESCRIPTION: |
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243 | * |
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244 | * This routine implements the rtems_message_queue_receive directive. |
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245 | * This directive is invoked when the calling task wishes to receive |
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246 | * a message from the message queue indicated by ID. The received |
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247 | * message is to be placed in buffer. If no messages are outstanding |
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248 | * and the option_set indicates that the task is willing to block, |
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249 | * then the task will be blocked until a message arrives or until, |
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250 | * optionally, timeout clock ticks have passed. |
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251 | */ |
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252 | |
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253 | rtems_status_code rtems_message_queue_receive( |
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254 | Objects_Id id, |
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255 | void *buffer, |
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256 | unsigned32 *size_p, |
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257 | unsigned32 option_set, |
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258 | rtems_interval timeout |
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259 | ); |
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260 | |
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261 | /* |
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262 | * rtems_message_queue_flush |
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263 | * |
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264 | * DESCRIPTION: |
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265 | * |
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266 | * This routine implements the rtems_message_queue_flush directive. |
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267 | * This directive takes all outstanding messages for the message |
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268 | * queue indicated by ID and returns them to the inactive message |
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269 | * chain. The number of messages flushed is returned in COUNT. |
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270 | */ |
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271 | |
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272 | rtems_status_code rtems_message_queue_flush( |
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273 | Objects_Id id, |
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274 | unsigned32 *count |
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275 | ); |
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276 | |
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277 | /* |
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278 | * _Message_queue_Copy_buffer |
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279 | * |
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280 | * DESCRIPTION: |
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281 | * |
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282 | * This routine copies the contents of the source message buffer |
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283 | * to the destination message buffer. |
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284 | */ |
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285 | |
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286 | STATIC INLINE void _Message_queue_Copy_buffer ( |
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287 | void *source, |
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288 | void *destination, |
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289 | unsigned32 size |
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290 | ); |
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291 | |
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292 | /* |
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293 | * _Message_queue_Seize |
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294 | * |
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295 | * DESCRIPTION: |
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296 | * |
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297 | * This routine attempts to receive a message from the_message_queue. |
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298 | * If a message is available or if the RTEMS_NO_WAIT option is enabled in |
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299 | * option_set, then the routine returns. Otherwise, the calling task |
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300 | * is blocked until a message is available. If a message is returned |
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301 | * to the task, then buffer will contain its contents. |
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302 | */ |
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303 | |
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304 | boolean _Message_queue_Seize( |
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305 | Message_queue_Control *the_message_queue, |
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306 | unsigned32 option_set, |
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307 | void *buffer, |
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308 | unsigned32 *size_p |
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309 | ); |
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310 | |
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311 | /* |
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312 | * _Message_queue_Flush_support |
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313 | * |
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314 | * DESCRIPTION: |
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315 | * |
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316 | * This routine flushes all outstanding messages and returns |
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317 | * them to the inactive message chain. |
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318 | */ |
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319 | |
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320 | unsigned32 _Message_queue_Flush_support( |
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321 | Message_queue_Control *the_message_queue |
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322 | ); |
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323 | |
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324 | /* |
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325 | * _Message_queue_Submit |
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326 | * |
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327 | * DESCRIPTION: |
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328 | * |
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329 | * This routine provides the common foundation for the |
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330 | * rtems_message_queue_send and rtems_message_queue_urgent directives. |
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331 | */ |
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332 | |
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333 | rtems_status_code _Message_queue_Submit( |
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334 | Objects_Id id, |
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335 | void *buffer, |
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336 | unsigned32 size, |
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337 | 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 | * _Message_queue_Allocate_message_buffer |
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342 | * |
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343 | * DESCRIPTION: |
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344 | * |
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345 | * This function allocates a message buffer from the inactive |
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346 | * message buffer chain. |
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347 | */ |
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348 | |
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349 | STATIC INLINE Message_queue_Buffer_control * |
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350 | _Message_queue_Allocate_message_buffer ( |
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351 | Message_queue_Control *the_message_queue |
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352 | ); |
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353 | |
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354 | /* |
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355 | * _Message_queue_Free_message_buffer |
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356 | * |
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357 | * DESCRIPTION: |
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358 | * |
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359 | * This routine frees a message buffer to the inactive |
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360 | * message buffer chain. |
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361 | */ |
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362 | |
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363 | STATIC INLINE void _Message_queue_Free_message_buffer ( |
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364 | Message_queue_Control *the_message_queue, |
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365 | Message_queue_Buffer_control *the_message |
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366 | ); |
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367 | |
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368 | /* |
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369 | * _Message_queue_Get_pending_message |
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370 | * |
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371 | * DESCRIPTION: |
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372 | * |
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373 | * This function removes the first message from the_message_queue |
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374 | * and returns a pointer to it. |
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375 | */ |
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376 | |
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377 | STATIC INLINE |
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378 | Message_queue_Buffer_control *_Message_queue_Get_pending_message ( |
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379 | Message_queue_Control *the_message_queue |
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380 | ); |
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381 | |
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382 | /* |
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383 | * _Message_queue_Append |
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384 | * |
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385 | * DESCRIPTION: |
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386 | * |
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387 | * This routine places the_message at the rear of the outstanding |
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388 | * messages on the_message_queue. |
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389 | */ |
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390 | |
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391 | STATIC INLINE void _Message_queue_Append ( |
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392 | Message_queue_Control *the_message_queue, |
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393 | Message_queue_Buffer_control *the_message |
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394 | ); |
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395 | |
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396 | /* |
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397 | * _Message_queue_Prepend |
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398 | * |
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399 | * DESCRIPTION: |
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400 | * |
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401 | * This routine places the_message at the rear of the outstanding |
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402 | * messages on the_message_queue. |
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403 | */ |
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404 | |
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405 | STATIC INLINE void _Message_queue_Prepend ( |
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406 | Message_queue_Control *the_message_queue, |
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407 | Message_queue_Buffer_control *the_message |
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408 | ); |
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409 | |
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410 | /* |
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411 | * _Message_queue_Is_null |
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412 | * |
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413 | * DESCRIPTION: |
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414 | * |
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415 | * This function places the_message at the rear of the outstanding |
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416 | * messages on the_message_queue. |
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417 | */ |
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418 | |
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419 | STATIC INLINE boolean _Message_queue_Is_null ( |
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420 | Message_queue_Control *the_message_queue |
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421 | ); |
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422 | |
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423 | /* |
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424 | * _Message_queue_Allocate |
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425 | * |
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426 | * DESCRIPTION: |
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427 | * |
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428 | * This function allocates a message queue control block from |
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429 | * the inactive chain of free message queue control blocks. |
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430 | */ |
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431 | |
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432 | Message_queue_Control *_Message_queue_Allocate ( |
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433 | unsigned32 count, |
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434 | unsigned32 max_message_size |
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435 | ); |
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436 | |
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437 | /* |
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438 | * _Message_queue_Free |
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439 | * |
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440 | * DESCRIPTION: |
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441 | * |
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442 | * This routine deallocates a message queue control block into |
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443 | * the inactive chain of free message queue control blocks. |
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444 | */ |
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445 | |
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446 | STATIC INLINE void _Message_queue_Free ( |
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447 | Message_queue_Control *the_message_queue |
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448 | ); |
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449 | |
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450 | /* |
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451 | * _Message_queue_Get |
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452 | * |
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453 | * DESCRIPTION: |
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454 | * |
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455 | * This function maps message queue IDs to message queue control |
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456 | * blocks. If ID corresponds to a local message queue, then it |
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457 | * returns the_message_queue control pointer which maps to ID |
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458 | * and location is set to OBJECTS_LOCAL. If the message queue ID is |
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459 | * global and resides on a remote node, then location is set |
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460 | * to OBJECTS_REMOTE, and the_message_queue is undefined. |
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461 | * Otherwise, location is set to OBJECTS_ERROR and |
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462 | * the_message_queue is undefined. |
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463 | */ |
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464 | |
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465 | STATIC INLINE Message_queue_Control *_Message_queue_Get ( |
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466 | Objects_Id id, |
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467 | Objects_Locations *location |
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468 | ); |
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469 | |
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470 | #include <rtems/message.inl> |
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471 | #include <rtems/msgmp.h> |
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472 | |
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473 | #ifdef __cplusplus |
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474 | } |
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475 | #endif |
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476 | |
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477 | #endif |
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478 | /* end of include file */ |
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