1 | /* |
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2 | * CORE Message Queue Handler |
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3 | * |
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4 | * DESCRIPTION: |
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5 | * |
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6 | * This package is the implementation of the CORE Message Queue Handler. |
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7 | * This core object provides task synchronization and communication functions |
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8 | * via messages passed to queue objects. |
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9 | * |
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10 | * COPYRIGHT (c) 1989-1997. |
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11 | * On-Line Applications Research Corporation (OAR). |
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12 | * Copyright assigned to U.S. Government, 1994. |
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13 | * |
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14 | * The license and distribution terms for this file may in |
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15 | * the file LICENSE in this distribution or at |
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16 | * http://www.OARcorp.com/rtems/license.html. |
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17 | * |
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18 | * $Id$ |
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19 | */ |
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20 | |
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21 | #include <rtems/system.h> |
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22 | #include <rtems/score/chain.h> |
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23 | #include <rtems/score/isr.h> |
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24 | #include <rtems/score/object.h> |
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25 | #include <rtems/score/coremsg.h> |
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26 | #include <rtems/score/states.h> |
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27 | #include <rtems/score/thread.h> |
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28 | #include <rtems/score/wkspace.h> |
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29 | #include <rtems/score/mpci.h> |
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30 | |
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31 | /*PAGE |
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32 | * |
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33 | * _CORE_message_queue_Initialize |
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34 | * |
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35 | * This routine initializes a newly created message queue based on the |
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36 | * specified data. |
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37 | * |
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38 | * Input parameters: |
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39 | * the_message_queue - the message queue to initialize |
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40 | * the_class - the API specific object class |
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41 | * the_message_queue_attributes - the message queue's attributes |
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42 | * maximum_pending_messages - maximum message and reserved buffer count |
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43 | * maximum_message_size - maximum size of each message |
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44 | * proxy_extract_callout - remote extract support |
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45 | * |
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46 | * Output parameters: |
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47 | * TRUE - if the message queue is initialized |
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48 | * FALSE - if the message queue is NOT initialized |
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49 | */ |
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50 | |
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51 | boolean _CORE_message_queue_Initialize( |
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52 | CORE_message_queue_Control *the_message_queue, |
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53 | Objects_Classes the_class, |
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54 | CORE_message_queue_Attributes *the_message_queue_attributes, |
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55 | unsigned32 maximum_pending_messages, |
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56 | unsigned32 maximum_message_size, |
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57 | Thread_queue_Extract_callout proxy_extract_callout |
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58 | ) |
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59 | { |
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60 | unsigned32 message_buffering_required; |
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61 | unsigned32 allocated_message_size; |
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62 | |
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63 | the_message_queue->maximum_pending_messages = maximum_pending_messages; |
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64 | the_message_queue->number_of_pending_messages = 0; |
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65 | the_message_queue->maximum_message_size = maximum_message_size; |
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66 | _CORE_message_queue_Set_notify( the_message_queue, NULL, NULL ); |
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67 | |
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68 | /* |
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69 | * round size up to multiple of a ptr for chain init |
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70 | */ |
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71 | |
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72 | allocated_message_size = maximum_message_size; |
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73 | if (allocated_message_size & (sizeof(unsigned32) - 1)) { |
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74 | allocated_message_size += sizeof(unsigned32); |
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75 | allocated_message_size &= ~(sizeof(unsigned32) - 1); |
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76 | } |
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77 | |
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78 | message_buffering_required = maximum_pending_messages * |
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79 | (allocated_message_size + sizeof(CORE_message_queue_Buffer_control)); |
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80 | |
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81 | the_message_queue->message_buffers = (CORE_message_queue_Buffer *) |
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82 | _Workspace_Allocate( message_buffering_required ); |
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83 | |
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84 | if (the_message_queue->message_buffers == 0) |
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85 | return FALSE; |
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86 | |
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87 | _Chain_Initialize ( |
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88 | &the_message_queue->Inactive_messages, |
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89 | the_message_queue->message_buffers, |
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90 | maximum_pending_messages, |
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91 | allocated_message_size + sizeof( CORE_message_queue_Buffer_control ) |
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92 | ); |
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93 | |
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94 | _Chain_Initialize_empty( &the_message_queue->Pending_messages ); |
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95 | |
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96 | _Thread_queue_Initialize( |
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97 | &the_message_queue->Wait_queue, |
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98 | the_class, |
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99 | _CORE_message_queue_Is_priority( the_message_queue_attributes ) ? |
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100 | THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO, |
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101 | STATES_WAITING_FOR_MESSAGE, |
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102 | proxy_extract_callout, |
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103 | CORE_MESSAGE_QUEUE_STATUS_TIMEOUT |
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104 | ); |
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105 | |
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106 | return TRUE; |
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107 | } |
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108 | |
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109 | /*PAGE |
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110 | * |
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111 | * _CORE_message_queue_Close |
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112 | * |
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113 | * This function closes a message by returning all allocated space and |
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114 | * flushing the message_queue's task wait queue. |
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115 | * |
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116 | * Input parameters: |
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117 | * the_message_queue - the message_queue to be flushed |
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118 | * remote_extract_callout - function to invoke remotely |
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119 | * status - status to pass to thread |
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120 | * |
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121 | * Output parameters: NONE |
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122 | */ |
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123 | |
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124 | void _CORE_message_queue_Close( |
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125 | CORE_message_queue_Control *the_message_queue, |
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126 | Thread_queue_Flush_callout remote_extract_callout, |
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127 | unsigned32 status |
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128 | ) |
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129 | { |
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130 | |
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131 | if ( the_message_queue->number_of_pending_messages != 0 ) |
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132 | (void) _CORE_message_queue_Flush_support( the_message_queue ); |
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133 | else |
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134 | _Thread_queue_Flush( |
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135 | &the_message_queue->Wait_queue, |
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136 | remote_extract_callout, |
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137 | status |
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138 | ); |
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139 | |
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140 | (void) _Workspace_Free( the_message_queue->message_buffers ); |
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141 | |
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142 | } |
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143 | |
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144 | /*PAGE |
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145 | * |
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146 | * _CORE_message_queue_Flush |
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147 | * |
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148 | * This function flushes the message_queue's task wait queue. The number |
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149 | * of messages flushed from the queue is returned. |
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150 | * |
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151 | * Input parameters: |
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152 | * the_message_queue - the message_queue to be flushed |
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153 | * |
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154 | * Output parameters: |
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155 | * returns - the number of messages flushed from the queue |
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156 | */ |
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157 | |
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158 | unsigned32 _CORE_message_queue_Flush( |
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159 | CORE_message_queue_Control *the_message_queue |
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160 | ) |
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161 | { |
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162 | if ( the_message_queue->number_of_pending_messages != 0 ) |
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163 | return _CORE_message_queue_Flush_support( the_message_queue ); |
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164 | else |
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165 | return 0; |
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166 | } |
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167 | |
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168 | /*PAGE |
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169 | * |
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170 | * _CORE_message_queue_Broadcast |
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171 | * |
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172 | * This function sends a message for every thread waiting on the queue and |
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173 | * returns the number of threads made ready by the message. |
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174 | * |
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175 | * Input parameters: |
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176 | * the_message_queue - message is submitted to this message queue |
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177 | * buffer - pointer to message buffer |
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178 | * size - size in bytes of message to send |
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179 | * id - id of message queue |
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180 | * api_message_queue_mp_support - api specific mp support callout |
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181 | * count - area to store number of threads made ready |
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182 | * |
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183 | * Output parameters: |
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184 | * count - number of threads made ready |
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185 | * CORE_MESSAGE_QUEUE_SUCCESSFUL - if successful |
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186 | * error code - if unsuccessful |
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187 | */ |
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188 | |
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189 | CORE_message_queue_Status _CORE_message_queue_Broadcast( |
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190 | CORE_message_queue_Control *the_message_queue, |
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191 | void *buffer, |
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192 | unsigned32 size, |
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193 | Objects_Id id, |
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194 | CORE_message_queue_API_mp_support_callout api_message_queue_mp_support, |
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195 | unsigned32 *count |
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196 | ) |
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197 | { |
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198 | Thread_Control *the_thread; |
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199 | unsigned32 number_broadcasted; |
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200 | Thread_Wait_information *waitp; |
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201 | unsigned32 constrained_size; |
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202 | |
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203 | number_broadcasted = 0; |
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204 | while ((the_thread = _Thread_queue_Dequeue(&the_message_queue->Wait_queue))) { |
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205 | waitp = &the_thread->Wait; |
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206 | number_broadcasted += 1; |
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207 | |
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208 | constrained_size = size; |
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209 | if ( size > the_message_queue->maximum_message_size ) |
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210 | constrained_size = the_message_queue->maximum_message_size; |
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211 | |
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212 | _CORE_message_queue_Copy_buffer( |
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213 | buffer, |
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214 | waitp->return_argument, |
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215 | constrained_size |
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216 | ); |
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217 | |
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218 | *(unsigned32 *)the_thread->Wait.return_argument_1 = size; |
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219 | |
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220 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
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221 | (*api_message_queue_mp_support) ( the_thread, id ); |
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222 | |
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223 | } |
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224 | *count = number_broadcasted; |
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225 | return CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL; |
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226 | } |
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227 | |
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228 | /*PAGE |
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229 | * |
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230 | * _CORE_message_queue_Seize |
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231 | * |
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232 | * This kernel routine dequeues a message, copies the message buffer to |
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233 | * a given destination buffer, and frees the message buffer to the |
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234 | * inactive message pool. The thread will be blocked if wait is TRUE, |
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235 | * otherwise an error will be given to the thread if no messages are available. |
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236 | * |
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237 | * Input parameters: |
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238 | * the_message_queue - pointer to message queue |
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239 | * id - id of object we are waitig on |
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240 | * buffer - pointer to message buffer to be filled |
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241 | * size - pointer to the size of buffer to be filled |
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242 | * wait - TRUE if wait is allowed, FALSE otherwise |
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243 | * timeout - time to wait for a message |
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244 | * |
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245 | * Output parameters: NONE |
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246 | * |
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247 | * NOTE: Dependent on BUFFER_LENGTH |
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248 | * |
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249 | * INTERRUPT LATENCY: |
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250 | * available |
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251 | * wait |
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252 | */ |
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253 | |
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254 | void _CORE_message_queue_Seize( |
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255 | CORE_message_queue_Control *the_message_queue, |
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256 | Objects_Id id, |
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257 | void *buffer, |
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258 | unsigned32 *size, |
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259 | boolean wait, |
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260 | Watchdog_Interval timeout |
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261 | ) |
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262 | { |
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263 | ISR_Level level; |
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264 | CORE_message_queue_Buffer_control *the_message; |
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265 | Thread_Control *executing; |
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266 | |
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267 | executing = _Thread_Executing; |
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268 | executing->Wait.return_code = CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL; |
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269 | _ISR_Disable( level ); |
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270 | if ( the_message_queue->number_of_pending_messages != 0 ) { |
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271 | the_message_queue->number_of_pending_messages -= 1; |
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272 | |
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273 | the_message = _CORE_message_queue_Get_pending_message( the_message_queue ); |
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274 | _ISR_Enable( level ); |
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275 | *size = the_message->Contents.size; |
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276 | _CORE_message_queue_Copy_buffer(the_message->Contents.buffer,buffer,*size ); |
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277 | _CORE_message_queue_Free_message_buffer(the_message_queue, the_message ); |
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278 | return; |
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279 | } |
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280 | |
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281 | if ( !wait ) { |
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282 | _ISR_Enable( level ); |
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283 | executing->Wait.return_code = CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_NOWAIT; |
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284 | return; |
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285 | } |
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286 | |
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287 | _Thread_queue_Enter_critical_section( &the_message_queue->Wait_queue ); |
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288 | executing->Wait.queue = &the_message_queue->Wait_queue; |
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289 | executing->Wait.id = id; |
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290 | executing->Wait.return_argument = (void *)buffer; |
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291 | executing->Wait.return_argument_1 = (void *)size; |
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292 | _ISR_Enable( level ); |
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293 | |
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294 | _Thread_queue_Enqueue( &the_message_queue->Wait_queue, timeout ); |
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295 | } |
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296 | |
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297 | /*PAGE |
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298 | * |
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299 | * _CORE_message_queue_Flush_support |
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300 | * |
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301 | * This message handler routine removes all messages from a message queue |
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302 | * and returns them to the inactive message pool. The number of messages |
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303 | * flushed from the queue is returned |
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304 | * |
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305 | * Input parameters: |
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306 | * the_message_queue - pointer to message queue |
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307 | * |
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308 | * Output parameters: |
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309 | * returns - number of messages placed on inactive chain |
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310 | * |
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311 | * INTERRUPT LATENCY: |
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312 | * only case |
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313 | */ |
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314 | |
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315 | unsigned32 _CORE_message_queue_Flush_support( |
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316 | CORE_message_queue_Control *the_message_queue |
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317 | ) |
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318 | { |
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319 | ISR_Level level; |
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320 | Chain_Node *inactive_first; |
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321 | Chain_Node *message_queue_first; |
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322 | Chain_Node *message_queue_last; |
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323 | unsigned32 count; |
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324 | |
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325 | _ISR_Disable( level ); |
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326 | inactive_first = the_message_queue->Inactive_messages.first; |
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327 | message_queue_first = the_message_queue->Pending_messages.first; |
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328 | message_queue_last = the_message_queue->Pending_messages.last; |
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329 | |
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330 | the_message_queue->Inactive_messages.first = message_queue_first; |
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331 | message_queue_last->next = inactive_first; |
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332 | inactive_first->previous = message_queue_last; |
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333 | message_queue_first->previous = |
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334 | _Chain_Head( &the_message_queue->Inactive_messages ); |
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335 | |
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336 | _Chain_Initialize_empty( &the_message_queue->Pending_messages ); |
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337 | |
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338 | count = the_message_queue->number_of_pending_messages; |
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339 | the_message_queue->number_of_pending_messages = 0; |
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340 | _ISR_Enable( level ); |
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341 | return count; |
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342 | } |
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343 | |
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344 | /*PAGE |
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345 | * |
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346 | * _CORE_message_queue_Submit |
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347 | * |
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348 | * This routine implements the send and urgent message functions. It |
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349 | * processes a message that is to be submitted to the designated |
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350 | * message queue. The message will either be processed as a |
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351 | * send message which it will be inserted at the rear of the queue |
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352 | * or it will be processed as an urgent message which will be inserted |
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353 | * at the front of the queue. |
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354 | * |
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355 | * Input parameters: |
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356 | * the_message_queue - message is submitted to this message queue |
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357 | * buffer - pointer to message buffer |
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358 | * size - size in bytes of message to send |
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359 | * id - id of message queue |
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360 | * api_message_queue_mp_support - api specific mp support callout |
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361 | * submit_type - send or urgent message |
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362 | * |
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363 | * Output parameters: |
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364 | * CORE_MESSAGE_QUEUE_SUCCESSFUL - if successful |
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365 | * error code - if unsuccessful |
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366 | */ |
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367 | |
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368 | CORE_message_queue_Status _CORE_message_queue_Submit( |
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369 | CORE_message_queue_Control *the_message_queue, |
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370 | void *buffer, |
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371 | unsigned32 size, |
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372 | Objects_Id id, |
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373 | CORE_message_queue_API_mp_support_callout api_message_queue_mp_support, |
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374 | CORE_message_queue_Submit_types submit_type |
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375 | ) |
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376 | { |
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377 | CORE_message_queue_Buffer_control *the_message; |
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378 | Thread_Control *the_thread; |
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379 | |
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380 | if ( size > the_message_queue->maximum_message_size ) |
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381 | return CORE_MESSAGE_QUEUE_STATUS_INVALID_SIZE; |
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382 | |
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383 | /* |
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384 | * Is there a thread currently waiting on this message queue? |
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385 | */ |
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386 | |
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387 | the_thread = _Thread_queue_Dequeue( &the_message_queue->Wait_queue ); |
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388 | if ( the_thread ) |
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389 | { |
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390 | _CORE_message_queue_Copy_buffer( |
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391 | buffer, |
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392 | the_thread->Wait.return_argument, |
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393 | size |
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394 | ); |
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395 | *(unsigned32 *)the_thread->Wait.return_argument_1 = size; |
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396 | |
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397 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) |
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398 | (*api_message_queue_mp_support) ( the_thread, id ); |
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399 | |
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400 | return CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL; |
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401 | } |
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402 | |
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403 | /* |
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404 | * No one waiting on this one currently. |
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405 | * Allocate a message buffer and store it away |
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406 | */ |
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407 | |
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408 | if ( the_message_queue->number_of_pending_messages == |
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409 | the_message_queue->maximum_pending_messages ) { |
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410 | return CORE_MESSAGE_QUEUE_STATUS_TOO_MANY; |
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411 | } |
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412 | |
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413 | the_message = _CORE_message_queue_Allocate_message_buffer(the_message_queue); |
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414 | if ( the_message == 0) |
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415 | return CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED; |
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416 | |
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417 | _CORE_message_queue_Copy_buffer( buffer, the_message->Contents.buffer, size ); |
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418 | the_message->Contents.size = size; |
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419 | |
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420 | the_message_queue->number_of_pending_messages += 1; |
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421 | |
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422 | switch ( submit_type ) { |
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423 | case CORE_MESSAGE_QUEUE_SEND_REQUEST: |
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424 | _CORE_message_queue_Append( the_message_queue, the_message ); |
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425 | break; |
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426 | case CORE_MESSAGE_QUEUE_URGENT_REQUEST: |
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427 | _CORE_message_queue_Prepend( the_message_queue, the_message ); |
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428 | break; |
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429 | } |
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430 | |
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431 | return CORE_MESSAGE_QUEUE_STATUS_SUCCESSFUL; |
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432 | } |
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