1 | /* |
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2 | * Message Queue Manager |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * All rights assigned to U.S. Government, 1994. |
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8 | * |
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9 | * This material may be reproduced by or for the U.S. Government pursuant |
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10 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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11 | * notice must appear in all copies of this file and its derivatives. |
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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 | #include <rtems/system.h> |
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17 | #include <rtems/attr.h> |
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18 | #include <rtems/chain.h> |
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19 | #include <rtems/config.h> |
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20 | #include <rtems/isr.h> |
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21 | #include <rtems/message.h> |
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22 | #include <rtems/object.h> |
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23 | #include <rtems/options.h> |
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24 | #include <rtems/states.h> |
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25 | #include <rtems/support.h> |
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26 | #include <rtems/thread.h> |
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27 | #include <rtems/wkspace.h> |
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28 | #include <rtems/mpci.h> |
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29 | |
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30 | /*PAGE |
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31 | * |
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32 | * _Message_queue_Manager_initialization |
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33 | * |
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34 | * This routine initializes all message queue manager related |
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35 | * data structures. |
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36 | * |
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37 | * Input parameters: |
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38 | * maximum_message_queues - number of message queues to initialize |
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39 | * |
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40 | * Output parameters: NONE |
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41 | */ |
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42 | |
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43 | void _Message_queue_Manager_initialization( |
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44 | unsigned32 maximum_message_queues |
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45 | ) |
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46 | { |
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47 | _Objects_Initialize_information( |
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48 | &_Message_queue_Information, |
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49 | OBJECTS_RTEMS_MESSAGE_QUEUES, |
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50 | TRUE, |
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51 | maximum_message_queues, |
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52 | sizeof( Message_queue_Control ), |
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53 | FALSE, |
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54 | RTEMS_MAXIMUM_NAME_LENGTH, |
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55 | FALSE |
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56 | ); |
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57 | } |
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58 | |
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59 | /*PAGE |
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60 | * |
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61 | * _Message_queue_Allocate |
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62 | * |
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63 | * Allocate a message queue and the space for its messages |
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64 | */ |
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65 | |
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66 | Message_queue_Control *_Message_queue_Allocate ( |
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67 | unsigned32 count, |
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68 | unsigned32 max_message_size |
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69 | ) |
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70 | { |
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71 | Message_queue_Control *mq = 0; |
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72 | unsigned32 message_buffering_required; |
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73 | unsigned32 allocated_message_size; |
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74 | |
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75 | mq = \ |
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76 | (Message_queue_Control *)_Objects_Allocate(&_Message_queue_Information); |
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77 | |
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78 | if (mq == 0) |
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79 | goto failed; |
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80 | |
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81 | mq->maximum_message_size = max_message_size; |
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82 | |
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83 | /* |
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84 | * round size up to multiple of a ptr for chain init |
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85 | */ |
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86 | |
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87 | allocated_message_size = max_message_size; |
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88 | if (allocated_message_size & (sizeof(unsigned32) - 1)) { |
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89 | allocated_message_size += sizeof(unsigned32); |
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90 | allocated_message_size &= ~(sizeof(unsigned32) - 1); |
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91 | } |
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92 | |
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93 | message_buffering_required = |
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94 | count * (allocated_message_size + sizeof(Message_queue_Buffer_control)); |
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95 | |
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96 | mq->message_buffers = |
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97 | (Message_queue_Buffer *) _Workspace_Allocate(message_buffering_required); |
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98 | |
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99 | if (mq->message_buffers == 0) |
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100 | goto failed; |
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101 | |
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102 | _Chain_Initialize |
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103 | (&mq->Inactive_messages, |
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104 | mq->message_buffers, |
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105 | count, |
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106 | allocated_message_size + sizeof(Message_queue_Buffer_control) |
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107 | ); |
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108 | return mq; |
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109 | |
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110 | failed: |
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111 | if (mq) |
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112 | _Message_queue_Free(mq); |
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113 | return (Message_queue_Control *) 0; |
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114 | } |
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115 | |
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116 | /*PAGE |
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117 | * |
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118 | * rtems_message_queue_create |
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119 | * |
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120 | * This directive creates a message queue by allocating and initializing |
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121 | * a message queue data structure. |
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122 | * |
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123 | * Input parameters: |
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124 | * name - user defined queue name |
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125 | * count - maximum message and reserved buffer count |
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126 | * max_message_size - maximum size of each message |
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127 | * attribute_set - process method |
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128 | * id - pointer to queue |
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129 | * |
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130 | * Output parameters: |
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131 | * id - queue id |
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132 | * RTEMS_SUCCESSFUL - if successful |
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133 | * error code - if unsuccessful |
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134 | */ |
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135 | |
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136 | rtems_status_code rtems_message_queue_create( |
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137 | rtems_name name, |
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138 | unsigned32 count, |
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139 | unsigned32 max_message_size, |
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140 | rtems_attribute attribute_set, |
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141 | Objects_Id *id |
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142 | ) |
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143 | { |
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144 | register Message_queue_Control *the_message_queue; |
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145 | |
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146 | if ( !rtems_is_name_valid( name ) ) |
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147 | return ( RTEMS_INVALID_NAME ); |
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148 | |
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149 | if ( _Attributes_Is_global( attribute_set ) && |
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150 | !_Configuration_Is_multiprocessing() ) |
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151 | return( RTEMS_MP_NOT_CONFIGURED ); |
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152 | |
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153 | if (count == 0) |
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154 | return RTEMS_INVALID_NUMBER; |
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155 | |
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156 | if (max_message_size == 0) |
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157 | return RTEMS_INVALID_SIZE; |
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158 | |
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159 | #if 1 |
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160 | /* |
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161 | * I am not 100% sure this should be an error. |
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162 | * It seems reasonable to create a que with a large max size, |
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163 | * and then just send smaller msgs from remote (or all) nodes. |
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164 | */ |
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165 | |
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166 | if ( _Attributes_Is_global( attribute_set ) && |
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167 | _Configuration_MPCI_table && |
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168 | (_Configuration_MPCI_table->maximum_packet_size < max_message_size)) |
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169 | { |
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170 | return RTEMS_INVALID_SIZE; |
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171 | } |
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172 | #endif |
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173 | |
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174 | _Thread_Disable_dispatch(); /* protects object pointer */ |
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175 | |
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176 | the_message_queue = _Message_queue_Allocate(count, max_message_size); |
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177 | |
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178 | if ( !the_message_queue ) { |
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179 | _Thread_Enable_dispatch(); |
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180 | return( RTEMS_TOO_MANY ); |
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181 | } |
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182 | |
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183 | if ( _Attributes_Is_global( attribute_set ) && |
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184 | !( _Objects_MP_Allocate_and_open( &_Message_queue_Information, name, |
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185 | the_message_queue->Object.id, FALSE ) ) ) { |
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186 | _Message_queue_Free( the_message_queue ); |
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187 | _Thread_Enable_dispatch(); |
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188 | return RTEMS_TOO_MANY; |
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189 | } |
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190 | |
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191 | the_message_queue->maximum_pending_messages = count; |
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192 | |
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193 | the_message_queue->attribute_set = attribute_set; |
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194 | the_message_queue->number_of_pending_messages = 0; |
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195 | |
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196 | _Chain_Initialize_empty( &the_message_queue->Pending_messages ); |
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197 | |
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198 | _Thread_queue_Initialize( |
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199 | &the_message_queue->Wait_queue, |
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200 | OBJECTS_RTEMS_MESSAGE_QUEUES, |
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201 | _Attributes_Is_priority( attribute_set ) ? |
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202 | THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO, |
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203 | STATES_WAITING_FOR_MESSAGE, |
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204 | _Message_queue_MP_Send_extract_proxy |
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205 | ); |
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206 | |
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207 | _Objects_Open( |
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208 | &_Message_queue_Information, |
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209 | &the_message_queue->Object, |
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210 | &name |
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211 | ); |
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212 | |
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213 | *id = the_message_queue->Object.id; |
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214 | |
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215 | if ( _Attributes_Is_global( attribute_set ) ) |
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216 | _Message_queue_MP_Send_process_packet( |
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217 | MESSAGE_QUEUE_MP_ANNOUNCE_CREATE, |
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218 | the_message_queue->Object.id, |
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219 | name, |
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220 | 0 |
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221 | ); |
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222 | |
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223 | _Thread_Enable_dispatch(); |
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224 | return( RTEMS_SUCCESSFUL ); |
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225 | } |
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226 | |
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227 | /*PAGE |
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228 | * |
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229 | * rtems_message_queue_ident |
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230 | * |
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231 | * This directive returns the system ID associated with |
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232 | * the message queue name. |
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233 | * |
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234 | * Input parameters: |
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235 | * name - user defined message queue name |
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236 | * node - node(s) to be searched |
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237 | * id - pointer to message queue id |
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238 | * |
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239 | * Output parameters: |
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240 | * *id - message queue id |
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241 | * RTEMS_SUCCESSFUL - if successful |
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242 | * error code - if unsuccessful |
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243 | */ |
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244 | |
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245 | rtems_status_code rtems_message_queue_ident( |
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246 | rtems_name name, |
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247 | unsigned32 node, |
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248 | Objects_Id *id |
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249 | ) |
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250 | { |
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251 | return _Objects_Name_to_id( |
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252 | &_Message_queue_Information, |
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253 | &name, |
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254 | node, |
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255 | id |
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256 | ); |
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257 | } |
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258 | |
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259 | /*PAGE |
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260 | * |
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261 | * rtems_message_queue_delete |
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262 | * |
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263 | * This directive allows a thread to delete the message queue specified |
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264 | * by the given queue identifier. |
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265 | * |
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266 | * Input parameters: |
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267 | * id - queue id |
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268 | * |
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269 | * Output parameters: |
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270 | * RTEMS_SUCCESSFUL - if successful |
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271 | * error code - if unsuccessful |
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272 | */ |
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273 | |
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274 | rtems_status_code rtems_message_queue_delete( |
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275 | Objects_Id id |
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276 | ) |
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277 | { |
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278 | register Message_queue_Control *the_message_queue; |
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279 | Objects_Locations location; |
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280 | |
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281 | the_message_queue = _Message_queue_Get( id, &location ); |
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282 | switch ( location ) { |
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283 | case OBJECTS_ERROR: |
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284 | return( RTEMS_INVALID_ID ); |
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285 | case OBJECTS_REMOTE: |
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286 | _Thread_Dispatch(); |
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287 | return( RTEMS_ILLEGAL_ON_REMOTE_OBJECT ); |
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288 | case OBJECTS_LOCAL: |
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289 | _Objects_Close( &_Message_queue_Information, |
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290 | &the_message_queue->Object ); |
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291 | |
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292 | if ( the_message_queue->number_of_pending_messages != 0 ) |
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293 | (void) _Message_queue_Flush_support( the_message_queue ); |
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294 | else |
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295 | _Thread_queue_Flush( |
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296 | &the_message_queue->Wait_queue, |
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297 | _Message_queue_MP_Send_object_was_deleted |
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298 | ); |
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299 | |
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300 | _Message_queue_Free( the_message_queue ); |
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301 | |
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302 | if ( _Attributes_Is_global( the_message_queue->attribute_set ) ) { |
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303 | _Objects_MP_Close( |
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304 | &_Message_queue_Information, |
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305 | the_message_queue->Object.id |
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306 | ); |
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307 | |
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308 | _Message_queue_MP_Send_process_packet( |
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309 | MESSAGE_QUEUE_MP_ANNOUNCE_DELETE, |
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310 | the_message_queue->Object.id, |
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311 | 0, /* Not used */ |
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312 | 0 |
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313 | ); |
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314 | } |
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315 | |
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316 | _Thread_Enable_dispatch(); |
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317 | return( RTEMS_SUCCESSFUL ); |
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318 | } |
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319 | |
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320 | return( RTEMS_INTERNAL_ERROR ); /* unreached - only to remove warnings */ |
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321 | } |
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322 | |
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323 | /*PAGE |
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324 | * |
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325 | * rtems_message_queue_send |
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326 | * |
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327 | * This routine implements the directives q_send. It sends a |
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328 | * message to the specified message queue. |
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329 | * |
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330 | * Input parameters: |
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331 | * id - pointer to message queue |
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332 | * buffer - pointer to message buffer |
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333 | * |
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334 | * Output parameters: |
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335 | * RTEMS_SUCCESSFUL - if successful |
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336 | * error code - if unsuccessful |
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337 | */ |
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338 | |
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339 | rtems_status_code rtems_message_queue_send( |
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340 | Objects_Id id, |
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341 | void *buffer, |
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342 | unsigned32 size |
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343 | ) |
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344 | { |
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345 | return _Message_queue_Submit(id, buffer, size, MESSAGE_QUEUE_SEND_REQUEST); |
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346 | } |
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347 | |
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348 | /*PAGE |
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349 | * |
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350 | * rtems_message_queue_urgent |
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351 | * |
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352 | * This routine implements the directives q_urgent. It urgents a |
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353 | * message to the specified message queue. |
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354 | * |
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355 | * Input parameters: |
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356 | * id - pointer to message queue |
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357 | * buffer - pointer to message buffer |
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358 | * |
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359 | * Output parameters: |
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360 | * RTEMS_SUCCESSFUL - if successful |
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361 | * error code - if unsuccessful |
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362 | */ |
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363 | |
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364 | rtems_status_code rtems_message_queue_urgent( |
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365 | Objects_Id id, |
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366 | void *buffer, |
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367 | unsigned32 size |
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368 | ) |
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369 | { |
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370 | return _Message_queue_Submit(id, buffer, size, MESSAGE_QUEUE_URGENT_REQUEST); |
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371 | } |
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372 | |
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373 | /*PAGE |
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374 | * |
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375 | * rtems_message_queue_broadcast |
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376 | * |
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377 | * This directive sends a message for every thread waiting on the queue |
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378 | * designated by id. |
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379 | * |
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380 | * Input parameters: |
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381 | * id - pointer to message queue |
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382 | * buffer - pointer to message buffer |
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383 | * count - pointer to area to store number of threads made ready |
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384 | * |
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385 | * Output parameters: |
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386 | * count - number of threads made ready |
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387 | * RTEMS_SUCCESSFUL - if successful |
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388 | * error code - if unsuccessful |
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389 | */ |
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390 | |
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391 | rtems_status_code rtems_message_queue_broadcast( |
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392 | Objects_Id id, |
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393 | void *buffer, |
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394 | unsigned32 size, |
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395 | unsigned32 *count |
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396 | ) |
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397 | { |
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398 | register Message_queue_Control *the_message_queue; |
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399 | Objects_Locations location; |
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400 | Thread_Control *the_thread; |
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401 | unsigned32 number_broadcasted; |
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402 | |
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403 | the_message_queue = _Message_queue_Get( id, &location ); |
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404 | switch ( location ) { |
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405 | case OBJECTS_ERROR: |
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406 | return( RTEMS_INVALID_ID ); |
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407 | case OBJECTS_REMOTE: |
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408 | _Thread_Executing->Wait.return_argument = count; |
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409 | |
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410 | return |
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411 | _Message_queue_MP_Send_request_packet( |
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412 | MESSAGE_QUEUE_MP_BROADCAST_REQUEST, |
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413 | id, |
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414 | buffer, |
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415 | &size, |
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416 | 0, /* option_set not used */ |
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417 | MPCI_DEFAULT_TIMEOUT |
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418 | ); |
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419 | |
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420 | case OBJECTS_LOCAL: |
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421 | { |
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422 | Thread_Wait_information *waitp; |
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423 | unsigned32 constrained_size; |
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424 | |
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425 | number_broadcasted = 0; |
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426 | while ( (the_thread = |
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427 | _Thread_queue_Dequeue(&the_message_queue->Wait_queue)) ) { |
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428 | waitp = &the_thread->Wait; |
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429 | number_broadcasted += 1; |
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430 | |
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431 | constrained_size = size; |
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432 | if (size > the_message_queue->maximum_message_size) |
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433 | constrained_size = the_message_queue->maximum_message_size; |
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434 | |
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435 | _Message_queue_Copy_buffer(buffer, |
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436 | waitp->return_argument, |
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437 | constrained_size); |
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438 | |
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439 | *waitp->Extra.message_size_p = constrained_size; |
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440 | |
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441 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) { |
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442 | the_thread->receive_packet->return_code = RTEMS_SUCCESSFUL; |
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443 | |
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444 | _Message_queue_MP_Send_response_packet( |
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445 | MESSAGE_QUEUE_MP_RECEIVE_RESPONSE, |
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446 | id, |
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447 | the_thread |
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448 | ); |
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449 | } |
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450 | } |
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451 | _Thread_Enable_dispatch(); |
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452 | *count = number_broadcasted; |
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453 | return( RTEMS_SUCCESSFUL ); |
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454 | } |
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455 | |
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456 | default: |
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457 | return RTEMS_INTERNAL_ERROR; |
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458 | } |
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459 | } |
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460 | |
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461 | /*PAGE |
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462 | * |
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463 | * rtems_message_queue_receive |
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464 | * |
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465 | * This directive dequeues a message from the designated message queue |
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466 | * and copies it into the requesting thread's buffer. |
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467 | * |
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468 | * Input parameters: |
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469 | * id - queue id |
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470 | * buffer - pointer to message buffer |
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471 | * option_set - options on receive |
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472 | * timeout - number of ticks to wait |
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473 | * |
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474 | * Output parameters: |
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475 | * RTEMS_SUCCESSFUL - if successful |
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476 | * error code - if unsuccessful |
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477 | */ |
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478 | |
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479 | rtems_status_code rtems_message_queue_receive( |
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480 | Objects_Id id, |
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481 | void *buffer, |
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482 | unsigned32 *size_p, |
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483 | unsigned32 option_set, |
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484 | rtems_interval timeout |
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485 | ) |
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486 | { |
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487 | register Message_queue_Control *the_message_queue; |
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488 | Objects_Locations location; |
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489 | |
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490 | the_message_queue = _Message_queue_Get( id, &location ); |
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491 | switch ( location ) { |
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492 | |
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493 | case OBJECTS_ERROR: |
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494 | return( RTEMS_INVALID_ID ); |
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495 | |
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496 | case OBJECTS_REMOTE: |
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497 | _Thread_Executing->Wait.return_argument = buffer; |
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498 | |
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499 | return _Message_queue_MP_Send_request_packet( |
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500 | MESSAGE_QUEUE_MP_RECEIVE_REQUEST, |
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501 | id, |
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502 | buffer, |
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503 | size_p, |
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504 | option_set, |
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505 | timeout |
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506 | ); |
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507 | |
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508 | case OBJECTS_LOCAL: |
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509 | if ( ! _Message_queue_Seize(the_message_queue, |
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510 | option_set, |
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511 | buffer, |
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512 | size_p)) |
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513 | { |
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514 | _Thread_queue_Enqueue( &the_message_queue->Wait_queue, timeout ); |
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515 | } |
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516 | _Thread_Enable_dispatch(); |
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517 | return _Thread_Executing->Wait.return_code; |
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518 | } |
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519 | |
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520 | return( RTEMS_INTERNAL_ERROR ); /* unreached - only to remove warnings */ |
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521 | } |
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522 | |
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523 | /*PAGE |
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524 | * |
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525 | * rtems_message_queue_flush |
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526 | * |
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527 | * This directive removes all pending messages from a queue and returns |
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528 | * the number of messages removed. If no messages were present then |
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529 | * a count of zero is returned. |
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530 | * |
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531 | * Input parameters: |
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532 | * id - queue id |
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533 | * count - return area for count |
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534 | * |
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535 | * Output parameters: |
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536 | * count - number of messages removed ( 0 = empty queue ) |
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537 | * RTEMS_SUCCESSFUL - if successful |
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538 | * error code - if unsuccessful |
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539 | */ |
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540 | |
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541 | rtems_status_code rtems_message_queue_flush( |
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542 | Objects_Id id, |
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543 | unsigned32 *count |
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544 | ) |
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545 | { |
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546 | register Message_queue_Control *the_message_queue; |
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547 | Objects_Locations location; |
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548 | |
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549 | the_message_queue = _Message_queue_Get( id, &location ); |
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550 | switch ( location ) { |
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551 | case OBJECTS_ERROR: |
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552 | return( RTEMS_INVALID_ID ); |
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553 | case OBJECTS_REMOTE: |
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554 | _Thread_Executing->Wait.return_argument = count; |
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555 | |
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556 | return |
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557 | _Message_queue_MP_Send_request_packet( |
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558 | MESSAGE_QUEUE_MP_FLUSH_REQUEST, |
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559 | id, |
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560 | 0, /* buffer not used */ |
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561 | 0, /* size_p */ |
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562 | 0, /* option_set not used */ |
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563 | MPCI_DEFAULT_TIMEOUT |
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564 | ); |
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565 | |
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566 | case OBJECTS_LOCAL: |
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567 | if ( the_message_queue->number_of_pending_messages != 0 ) |
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568 | *count = _Message_queue_Flush_support( the_message_queue ); |
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569 | else |
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570 | *count = 0; |
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571 | _Thread_Enable_dispatch(); |
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572 | return( RTEMS_SUCCESSFUL ); |
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573 | } |
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574 | |
---|
575 | return( RTEMS_INTERNAL_ERROR ); /* unreached - only to remove warnings */ |
---|
576 | } |
---|
577 | |
---|
578 | /*PAGE |
---|
579 | * |
---|
580 | * _Message_queue_Seize |
---|
581 | * |
---|
582 | * This kernel routine dequeues a message, copies the message buffer to |
---|
583 | * a given destination buffer, and frees the message buffer to the |
---|
584 | * inactive message pool. |
---|
585 | * |
---|
586 | * Input parameters: |
---|
587 | * the_message_queue - pointer to message queue |
---|
588 | * option_set - options on receive |
---|
589 | * the_buffer - pointer to message buffer to be filled |
---|
590 | * |
---|
591 | * Output parameters: |
---|
592 | * TRUE - if message received or RTEMS_NO_WAIT and no message |
---|
593 | * FALSE - if thread is to block |
---|
594 | * |
---|
595 | * NOTE: Dependent on BUFFER_LENGTH |
---|
596 | * |
---|
597 | * INTERRUPT LATENCY: |
---|
598 | * available |
---|
599 | * wait |
---|
600 | */ |
---|
601 | |
---|
602 | boolean _Message_queue_Seize( |
---|
603 | Message_queue_Control *the_message_queue, |
---|
604 | rtems_option option_set, |
---|
605 | void *buffer, |
---|
606 | unsigned32 *size_p |
---|
607 | ) |
---|
608 | { |
---|
609 | ISR_Level level; |
---|
610 | Message_queue_Buffer_control *the_message; |
---|
611 | Thread_Control *executing; |
---|
612 | |
---|
613 | executing = _Thread_Executing; |
---|
614 | executing->Wait.return_code = RTEMS_SUCCESSFUL; |
---|
615 | _ISR_Disable( level ); |
---|
616 | if ( the_message_queue->number_of_pending_messages != 0 ) { |
---|
617 | the_message_queue->number_of_pending_messages -= 1; |
---|
618 | |
---|
619 | the_message = _Message_queue_Get_pending_message( the_message_queue ); |
---|
620 | _ISR_Enable( level ); |
---|
621 | *size_p = the_message->Contents.size; |
---|
622 | _Message_queue_Copy_buffer( the_message->Contents.buffer, buffer, *size_p ); |
---|
623 | _Message_queue_Free_message_buffer(the_message_queue, the_message ); |
---|
624 | return( TRUE ); |
---|
625 | } |
---|
626 | |
---|
627 | if ( _Options_Is_no_wait( option_set ) ) { |
---|
628 | _ISR_Enable( level ); |
---|
629 | executing->Wait.return_code = RTEMS_UNSATISFIED; |
---|
630 | return( TRUE ); |
---|
631 | } |
---|
632 | |
---|
633 | the_message_queue->Wait_queue.sync = TRUE; |
---|
634 | executing->Wait.queue = &the_message_queue->Wait_queue; |
---|
635 | executing->Wait.id = the_message_queue->Object.id; |
---|
636 | executing->Wait.option_set = option_set; |
---|
637 | executing->Wait.return_argument = (unsigned32 *)buffer; |
---|
638 | executing->Wait.Extra.message_size_p = size_p; |
---|
639 | _ISR_Enable( level ); |
---|
640 | return FALSE; |
---|
641 | } |
---|
642 | |
---|
643 | /*PAGE |
---|
644 | * |
---|
645 | * _Message_queue_Flush_support |
---|
646 | * |
---|
647 | * This message manager routine removes all messages from a message queue |
---|
648 | * and returns them to the inactive message pool. |
---|
649 | * |
---|
650 | * Input parameters: |
---|
651 | * the_message_queue - pointer to message queue |
---|
652 | * |
---|
653 | * Output parameters: |
---|
654 | * returns - number of messages placed on inactive chain |
---|
655 | * |
---|
656 | * INTERRUPT LATENCY: |
---|
657 | * only case |
---|
658 | */ |
---|
659 | |
---|
660 | unsigned32 _Message_queue_Flush_support( |
---|
661 | Message_queue_Control *the_message_queue |
---|
662 | ) |
---|
663 | { |
---|
664 | ISR_Level level; |
---|
665 | Chain_Node *inactive_first; |
---|
666 | Chain_Node *message_queue_first; |
---|
667 | Chain_Node *message_queue_last; |
---|
668 | unsigned32 count; |
---|
669 | |
---|
670 | _ISR_Disable( level ); |
---|
671 | inactive_first = the_message_queue->Inactive_messages.first; |
---|
672 | message_queue_first = the_message_queue->Pending_messages.first; |
---|
673 | message_queue_last = the_message_queue->Pending_messages.last; |
---|
674 | |
---|
675 | the_message_queue->Inactive_messages.first = message_queue_first; |
---|
676 | message_queue_last->next = inactive_first; |
---|
677 | inactive_first->previous = message_queue_last; |
---|
678 | message_queue_first->previous = |
---|
679 | _Chain_Head( &the_message_queue->Inactive_messages ); |
---|
680 | |
---|
681 | _Chain_Initialize_empty( &the_message_queue->Pending_messages ); |
---|
682 | |
---|
683 | count = the_message_queue->number_of_pending_messages; |
---|
684 | the_message_queue->number_of_pending_messages = 0; |
---|
685 | _ISR_Enable( level ); |
---|
686 | return count; |
---|
687 | } |
---|
688 | |
---|
689 | /*PAGE |
---|
690 | * |
---|
691 | * _Message_queue_Submit |
---|
692 | * |
---|
693 | * This routine implements the directives q_send and q_urgent. It |
---|
694 | * processes a message that is to be submitted to the designated |
---|
695 | * message queue. The message will either be processed as a send |
---|
696 | * send message which it will be inserted at the rear of the queue |
---|
697 | * or it will be processed as an urgent message which will be inserted |
---|
698 | * at the front of the queue. |
---|
699 | * |
---|
700 | * Input parameters: |
---|
701 | * id - pointer to message queue |
---|
702 | * buffer - pointer to message buffer |
---|
703 | * size - size in bytes of message to send |
---|
704 | * submit_type - send or urgent message |
---|
705 | * |
---|
706 | * Output parameters: |
---|
707 | * RTEMS_SUCCESSFUL - if successful |
---|
708 | * error code - if unsuccessful |
---|
709 | */ |
---|
710 | |
---|
711 | rtems_status_code _Message_queue_Submit( |
---|
712 | Objects_Id id, |
---|
713 | void *buffer, |
---|
714 | unsigned32 size, |
---|
715 | Message_queue_Submit_types submit_type |
---|
716 | ) |
---|
717 | { |
---|
718 | register Message_queue_Control *the_message_queue; |
---|
719 | Objects_Locations location; |
---|
720 | Thread_Control *the_thread; |
---|
721 | Message_queue_Buffer_control *the_message; |
---|
722 | |
---|
723 | the_message_queue = _Message_queue_Get( id, &location ); |
---|
724 | switch ( location ) |
---|
725 | { |
---|
726 | case OBJECTS_ERROR: |
---|
727 | return( RTEMS_INVALID_ID ); |
---|
728 | |
---|
729 | case OBJECTS_REMOTE: |
---|
730 | switch ( submit_type ) { |
---|
731 | case MESSAGE_QUEUE_SEND_REQUEST: |
---|
732 | return |
---|
733 | _Message_queue_MP_Send_request_packet( |
---|
734 | MESSAGE_QUEUE_MP_SEND_REQUEST, |
---|
735 | id, |
---|
736 | buffer, |
---|
737 | &size, |
---|
738 | 0, /* option_set */ |
---|
739 | MPCI_DEFAULT_TIMEOUT |
---|
740 | ); |
---|
741 | |
---|
742 | case MESSAGE_QUEUE_URGENT_REQUEST: |
---|
743 | return |
---|
744 | _Message_queue_MP_Send_request_packet( |
---|
745 | MESSAGE_QUEUE_MP_URGENT_REQUEST, |
---|
746 | id, |
---|
747 | buffer, |
---|
748 | &size, |
---|
749 | 0, /* option_set */ |
---|
750 | MPCI_DEFAULT_TIMEOUT |
---|
751 | ); |
---|
752 | } |
---|
753 | |
---|
754 | case OBJECTS_LOCAL: |
---|
755 | if (size > the_message_queue->maximum_message_size) |
---|
756 | { |
---|
757 | _Thread_Enable_dispatch(); |
---|
758 | return RTEMS_INVALID_SIZE; |
---|
759 | } |
---|
760 | |
---|
761 | /* |
---|
762 | * Is there a thread currently waiting on this message queue? |
---|
763 | */ |
---|
764 | |
---|
765 | the_thread = _Thread_queue_Dequeue( &the_message_queue->Wait_queue ); |
---|
766 | if ( the_thread ) |
---|
767 | { |
---|
768 | _Message_queue_Copy_buffer( |
---|
769 | buffer, |
---|
770 | the_thread->Wait.return_argument, |
---|
771 | size |
---|
772 | ); |
---|
773 | *the_thread->Wait.Extra.message_size_p = size; |
---|
774 | |
---|
775 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) { |
---|
776 | the_thread->receive_packet->return_code = RTEMS_SUCCESSFUL; |
---|
777 | |
---|
778 | _Message_queue_MP_Send_response_packet( |
---|
779 | MESSAGE_QUEUE_MP_RECEIVE_RESPONSE, |
---|
780 | id, |
---|
781 | the_thread |
---|
782 | ); |
---|
783 | |
---|
784 | } |
---|
785 | _Thread_Enable_dispatch(); |
---|
786 | return( RTEMS_SUCCESSFUL ); |
---|
787 | } |
---|
788 | |
---|
789 | /* |
---|
790 | * No one waiting on this one currently. |
---|
791 | * Allocate a message buffer and store it away |
---|
792 | */ |
---|
793 | |
---|
794 | if ( the_message_queue->number_of_pending_messages == |
---|
795 | the_message_queue->maximum_pending_messages ) { |
---|
796 | _Thread_Enable_dispatch(); |
---|
797 | return( RTEMS_TOO_MANY ); |
---|
798 | } |
---|
799 | |
---|
800 | the_message = _Message_queue_Allocate_message_buffer(the_message_queue); |
---|
801 | if ( the_message == 0) { |
---|
802 | _Thread_Enable_dispatch(); |
---|
803 | return( RTEMS_UNSATISFIED ); |
---|
804 | } |
---|
805 | |
---|
806 | _Message_queue_Copy_buffer( buffer, the_message->Contents.buffer, size ); |
---|
807 | the_message->Contents.size = size; |
---|
808 | |
---|
809 | the_message_queue->number_of_pending_messages += 1; |
---|
810 | |
---|
811 | switch ( submit_type ) { |
---|
812 | case MESSAGE_QUEUE_SEND_REQUEST: |
---|
813 | _Message_queue_Append( the_message_queue, the_message ); |
---|
814 | break; |
---|
815 | case MESSAGE_QUEUE_URGENT_REQUEST: |
---|
816 | _Message_queue_Prepend( the_message_queue, the_message ); |
---|
817 | break; |
---|
818 | } |
---|
819 | |
---|
820 | _Thread_Enable_dispatch(); |
---|
821 | return( RTEMS_SUCCESSFUL ); |
---|
822 | |
---|
823 | default: |
---|
824 | return RTEMS_INTERNAL_ERROR; /* And they were such nice boys, too! */ |
---|
825 | } |
---|
826 | } |
---|