1 | /* coremsg.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 Handler. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1999. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #ifndef __RTEMS_CORE_MESSAGE_QUEUE_h |
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17 | #define __RTEMS_CORE_MESSAGE_QUEUE_h |
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18 | |
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19 | #ifdef __cplusplus |
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20 | extern "C" { |
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21 | #endif |
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22 | |
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23 | #include <limits.h> |
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24 | #include <rtems/score/thread.h> |
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25 | #include <rtems/score/threadq.h> |
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26 | #include <rtems/score/priority.h> |
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27 | #include <rtems/score/watchdog.h> |
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28 | |
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29 | /* |
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30 | * The following type defines the callout which the API provides |
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31 | * to support global/multiprocessor operations on message_queues. |
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32 | */ |
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33 | |
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34 | typedef void ( *CORE_message_queue_API_mp_support_callout )( |
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35 | Thread_Control *, |
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36 | Objects_Id |
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37 | ); |
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38 | |
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39 | /* |
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40 | * The following defines the data types needed to manipulate |
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41 | * the contents of message buffers. |
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42 | * |
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43 | * NOTE: The buffer field is normally longer than a single unsigned32. |
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44 | * but since messages 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 | unsigned32 buffer[1]; |
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50 | } CORE_message_queue_Buffer; |
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51 | |
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52 | /* |
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53 | * The following records define the organization of a message |
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54 | * buffer. |
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55 | */ |
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56 | |
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57 | typedef struct { |
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58 | Chain_Node Node; |
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59 | int priority; |
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60 | CORE_message_queue_Buffer Contents; |
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61 | } CORE_message_queue_Buffer_control; |
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62 | |
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63 | /* |
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64 | * Blocking disciplines for a message_queue. |
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65 | */ |
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66 | |
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67 | typedef enum { |
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68 | CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO, |
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69 | CORE_MESSAGE_QUEUE_DISCIPLINES_PRIORITY |
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70 | } CORE_message_queue_Disciplines; |
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71 | |
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72 | /* |
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73 | * The following enumerated type details the modes in which a message |
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74 | * may be submitted to a message queue. The message may be posted |
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75 | * in a send or urgent fashion. |
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76 | * |
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77 | * NOTE: All other values are message priorities. Numerically smaller |
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78 | * priorities indicate higher priority messages. |
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79 | * |
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80 | */ |
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81 | |
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82 | #define CORE_MESSAGE_QUEUE_SEND_REQUEST INT_MAX |
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83 | #define CORE_MESSAGE_QUEUE_URGENT_REQUEST INT_MIN |
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84 | |
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85 | typedef int CORE_message_queue_Submit_types; |
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86 | |
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87 | /* |
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88 | * Core Message queue handler return statuses. |
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89 | */ |
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90 | |
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91 | typedef enum { |
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92 | CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL, |
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93 | CORE_MESSAGE_QUEUE_STATUS_INVALID_SIZE, |
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94 | CORE_MESSAGE_QUEUE_STATUS_TOO_MANY, |
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95 | CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED, |
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96 | CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_NOWAIT, |
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97 | CORE_MESSAGE_QUEUE_STATUS_WAS_DELETED, |
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98 | CORE_MESSAGE_QUEUE_STATUS_TIMEOUT |
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99 | } CORE_message_queue_Status; |
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100 | |
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101 | /* |
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102 | * The following defines the control block used to manage the |
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103 | * attributes of each message queue. |
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104 | */ |
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105 | |
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106 | typedef struct { |
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107 | CORE_message_queue_Disciplines discipline; |
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108 | } CORE_message_queue_Attributes; |
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109 | |
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110 | /* |
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111 | * The following defines the type for a Notification handler. A notification |
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112 | * handler is invoked when the message queue makes a 0->1 transition on |
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113 | * pending messages. |
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114 | */ |
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115 | |
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116 | typedef void (*CORE_message_queue_Notify_Handler)( void * ); |
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117 | |
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118 | /* |
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119 | * The following defines the control block used to manage each |
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120 | * counting message_queue. |
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121 | */ |
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122 | |
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123 | typedef struct { |
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124 | Thread_queue_Control Wait_queue; |
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125 | CORE_message_queue_Attributes Attributes; |
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126 | unsigned32 maximum_pending_messages; |
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127 | unsigned32 number_of_pending_messages; |
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128 | unsigned32 maximum_message_size; |
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129 | Chain_Control Pending_messages; |
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130 | CORE_message_queue_Buffer *message_buffers; |
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131 | CORE_message_queue_Notify_Handler notify_handler; |
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132 | void *notify_argument; |
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133 | Chain_Control Inactive_messages; |
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134 | } CORE_message_queue_Control; |
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135 | |
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136 | /* |
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137 | * _CORE_message_queue_Initialize |
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138 | * |
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139 | * DESCRIPTION: |
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140 | * |
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141 | * This routine initializes the message_queue based on the parameters passed. |
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142 | */ |
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143 | |
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144 | boolean _CORE_message_queue_Initialize( |
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145 | CORE_message_queue_Control *the_message_queue, |
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146 | Objects_Classes the_class, |
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147 | CORE_message_queue_Attributes *the_message_queue_attributes, |
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148 | unsigned32 maximum_pending_messages, |
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149 | unsigned32 maximum_message_size, |
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150 | Thread_queue_Extract_callout proxy_extract_callout |
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151 | ); |
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152 | |
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153 | /* |
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154 | * _CORE_message_queue_Close |
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155 | * |
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156 | * DESCRIPTION: |
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157 | * |
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158 | * This function closes a message by returning all allocated space and |
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159 | * flushing the message_queue's task wait queue. |
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160 | */ |
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161 | |
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162 | void _CORE_message_queue_Close( |
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163 | CORE_message_queue_Control *the_message_queue, |
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164 | Thread_queue_Flush_callout remote_extract_callout, |
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165 | unsigned32 status |
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166 | ); |
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167 | |
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168 | /* |
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169 | * _CORE_message_queue_Flush |
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170 | * |
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171 | * DESCRIPTION: |
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172 | * |
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173 | * This function flushes the message_queue's pending message queue. The |
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174 | * number of messages flushed from the queue is returned. |
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175 | * |
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176 | */ |
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177 | |
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178 | unsigned32 _CORE_message_queue_Flush( |
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179 | CORE_message_queue_Control *the_message_queue |
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180 | ); |
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181 | |
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182 | /* |
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183 | * _CORE_message_queue_Flush_support |
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184 | * |
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185 | * DESCRIPTION: |
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186 | * |
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187 | * This routine flushes all outstanding messages and returns |
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188 | * them to the inactive message chain. |
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189 | */ |
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190 | |
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191 | unsigned32 _CORE_message_queue_Flush_support( |
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192 | CORE_message_queue_Control *the_message_queue |
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193 | ); |
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194 | |
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195 | /* |
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196 | * _CORE_message_queue_Flush_waiting_threads |
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197 | * |
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198 | * DESCRIPTION: |
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199 | * |
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200 | * This function flushes the threads which are blocked on this |
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201 | * message_queue's pending message queue. They are unblocked whether |
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202 | * blocked sending or receiving. |
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203 | */ |
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204 | |
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205 | void _CORE_message_queue_Flush_waiting_threads( |
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206 | CORE_message_queue_Control *the_message_queue |
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207 | ); |
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208 | |
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209 | /* |
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210 | * _CORE_message_queue_Broadcast |
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211 | * |
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212 | * DESCRIPTION: |
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213 | * |
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214 | * This function sends a message for every thread waiting on the queue and |
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215 | * returns the number of threads made ready by the message. |
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216 | * |
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217 | */ |
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218 | |
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219 | CORE_message_queue_Status _CORE_message_queue_Broadcast( |
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220 | CORE_message_queue_Control *the_message_queue, |
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221 | void *buffer, |
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222 | unsigned32 size, |
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223 | Objects_Id id, |
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224 | CORE_message_queue_API_mp_support_callout api_message_queue_mp_support, |
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225 | unsigned32 *count |
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226 | ); |
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227 | |
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228 | /* |
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229 | * _CORE_message_queue_Submit |
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230 | * |
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231 | * DESCRIPTION: |
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232 | * |
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233 | * This routine implements the send and urgent message functions. It |
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234 | * processes a message that is to be submitted to the designated |
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235 | * message queue. The message will either be processed as a |
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236 | * send message which it will be inserted at the rear of the queue |
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237 | * or it will be processed as an urgent message which will be inserted |
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238 | * at the front of the queue. |
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239 | * |
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240 | */ |
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241 | |
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242 | CORE_message_queue_Status _CORE_message_queue_Submit( |
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243 | CORE_message_queue_Control *the_message_queue, |
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244 | void *buffer, |
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245 | unsigned32 size, |
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246 | Objects_Id id, |
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247 | CORE_message_queue_API_mp_support_callout api_message_queue_mp_support, |
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248 | CORE_message_queue_Submit_types submit_type, |
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249 | boolean wait, |
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250 | Watchdog_Interval timeout |
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251 | ); |
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252 | |
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253 | /* |
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254 | * _CORE_message_queue_Seize |
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255 | * |
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256 | * DESCRIPTION: |
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257 | * |
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258 | * This kernel routine dequeues a message, copies the message buffer to |
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259 | * a given destination buffer, and frees the message buffer to the |
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260 | * inactive message pool. The thread will be blocked if wait is TRUE, |
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261 | * otherwise an error will be given to the thread if no messages are available. |
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262 | * |
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263 | * NOTE: Returns message priority via return are in TCB. |
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264 | */ |
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265 | |
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266 | void _CORE_message_queue_Seize( |
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267 | CORE_message_queue_Control *the_message_queue, |
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268 | Objects_Id id, |
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269 | void *buffer, |
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270 | unsigned32 *size, |
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271 | boolean wait, |
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272 | Watchdog_Interval timeout |
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273 | ); |
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274 | |
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275 | /* |
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276 | * _CORE_message_queue_Insert_message |
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277 | * |
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278 | * DESCRIPTION: |
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279 | * |
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280 | * This kernel routine inserts the specified message into the |
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281 | * message queue. It is assumed that the message has been filled |
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282 | * in before this routine is called. |
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283 | */ |
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284 | |
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285 | void _CORE_message_queue_Insert_message( |
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286 | CORE_message_queue_Control *the_message_queue, |
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287 | CORE_message_queue_Buffer_control *the_message, |
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288 | CORE_message_queue_Submit_types submit_type |
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289 | ); |
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290 | |
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291 | #ifndef __RTEMS_APPLICATION__ |
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292 | #include <rtems/score/coremsg.inl> |
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293 | #endif |
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294 | |
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295 | #ifdef __cplusplus |
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296 | } |
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297 | #endif |
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298 | |
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299 | #endif |
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300 | /* end of include file */ |
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301 | |
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