1 | /* |
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2 | ------------------------------------------------------------------------ |
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3 | $Id$ |
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4 | ------------------------------------------------------------------------ |
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5 | |
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6 | COPYRIGHT (c) 1997 |
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7 | Objective Design Systems Ltd Pty (ODS) |
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8 | All rights reserved (R) Objective Design Systems Ltd Pty |
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9 | |
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10 | The license and distribution terms for this file may be found in the |
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11 | file LICENSE in this distribution or at |
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12 | http://www.OARcorp.com/rtems/license.html. |
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13 | |
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14 | ------------------------------------------------------------------------ |
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15 | |
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16 | rtemsMessageQueue class. |
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17 | |
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18 | This class allows the user to create a RTEMS message queue, or to |
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19 | access and manage an already existing message queue. |
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20 | |
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21 | The first constructor with the message queue parameters creates a |
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22 | RTEMS message queue object. The destructor of this object also |
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23 | deletes the message queue object. The last status code should be |
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24 | checked after construction to see if the create completed |
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25 | successfully. |
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26 | |
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27 | The second constructor connects to an existing message queue |
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28 | object. The last status code should be checked after construction to |
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29 | see if the message queue existed. |
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30 | |
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31 | The third constructor is a copy constructor. Connects to an existing |
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32 | object which is in scope. |
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33 | |
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34 | The fourth constructor allows for the message queue to be created |
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35 | after construction, or to connect to a message queue later. |
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36 | |
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37 | ------------------------------------------------------------------------ */ |
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38 | |
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39 | #if !defined(_rtemsMessageQueue_h_) |
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40 | #define _rtemsMessageQueue_h_ |
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41 | |
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42 | #include <rtems++/rtemsStatusCode.h> |
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43 | |
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44 | /* ---- |
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45 | rtemsMessageQueue |
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46 | */ |
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47 | |
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48 | class rtemsMessageQueue |
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49 | : public rtemsStatusCode |
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50 | { |
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51 | public: |
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52 | // attribute a message queue can have |
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53 | enum WaitMode { wait_by_fifo = RTEMS_FIFO, |
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54 | wait_by_priority = RTEMS_PRIORITY }; |
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55 | enum Scope { local = RTEMS_LOCAL, |
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56 | global = RTEMS_GLOBAL }; |
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57 | |
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58 | // only the first 4 characters of the name are taken |
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59 | |
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60 | // creates a message queue |
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61 | rtemsMessageQueue(const char* name, |
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62 | const rtems_unsigned32 count, |
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63 | const rtems_unsigned32 max_message_size, |
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64 | const WaitMode wait_mode = wait_by_fifo, |
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65 | const Scope scope = local); |
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66 | |
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67 | // connects to a message queue |
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68 | rtemsMessageQueue(const char *name, const rtems_unsigned32 node = RTEMS_SEARCH_ALL_NODES); |
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69 | |
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70 | // copy and default constructors |
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71 | rtemsMessageQueue(const rtemsMessageQueue& message_queue); |
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72 | rtemsMessageQueue(); |
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73 | |
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74 | // only the creator's destructor will delete the actual object |
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75 | virtual ~rtemsMessageQueue(); |
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76 | |
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77 | // create or destroy (delete) the message queue |
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78 | virtual const rtems_status_code create(const char* name, |
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79 | const rtems_unsigned32 count, |
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80 | const rtems_unsigned32 max_message_size, |
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81 | const WaitMode wait_mode = wait_by_fifo, |
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82 | const Scope scope = local); |
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83 | virtual const rtems_status_code destroy(); |
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84 | |
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85 | // connect to an existing message queue object, will not be the owner |
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86 | const rtemsMessageQueue& operator=(const rtemsMessageQueue& message_queue); |
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87 | virtual const rtems_status_code connect(const char *name, |
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88 | const rtems_unsigned32 node = RTEMS_SEARCH_ALL_NODES); |
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89 | |
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90 | // send a message of size from the buffer |
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91 | inline const rtems_status_code send(const void *buffer, |
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92 | const rtems_unsigned32 size); |
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93 | inline const rtems_status_code urgent(const void *buffer, |
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94 | const rtems_unsigned32 size); |
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95 | inline const rtems_status_code broadcast(const void *buffer, |
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96 | const rtems_unsigned32 size, |
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97 | rtems_unsigned32& count); |
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98 | |
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99 | // receive a message of size, the timeout is in micro-secs |
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100 | inline const rtems_status_code receive(const void *buffer, |
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101 | rtems_unsigned32& size, |
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102 | rtems_interval micro_secs = RTEMS_NO_TIMEOUT, |
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103 | bool wait = true); |
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104 | |
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105 | // flush a message queue, returning the number of messages dropped |
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106 | inline const rtems_status_code flush(rtems_unsigned32& size); |
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107 | |
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108 | // object id, and name |
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109 | const rtems_id id_is() const { return id; } |
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110 | const rtems_name name_is() const { return name; } |
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111 | const char *name_string() const { return name_str; } |
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112 | |
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113 | private: |
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114 | |
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115 | // make this object reference an invalid RTEMS object |
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116 | void make_invalid(); |
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117 | |
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118 | // message queue name |
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119 | rtems_name name; |
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120 | char name_str[5]; |
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121 | |
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122 | // owner, true if this object owns the message queue |
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123 | // will delete the message queue when it destructs |
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124 | bool owner; |
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125 | |
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126 | // the rtems id, object handle |
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127 | rtems_id id; |
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128 | }; |
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129 | |
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130 | const rtems_status_code rtemsMessageQueue::send(const void *buffer, |
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131 | const rtems_unsigned32 size) |
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132 | { |
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133 | return set_status_code(rtems_message_queue_send(id, (void*) buffer, size)); |
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134 | } |
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135 | |
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136 | const rtems_status_code rtemsMessageQueue::urgent(const void *buffer, |
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137 | const rtems_unsigned32 size) |
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138 | { |
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139 | return set_status_code(rtems_message_queue_urgent(id, (void*) buffer, size)); |
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140 | } |
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141 | |
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142 | const rtems_status_code rtemsMessageQueue::broadcast(const void *buffer, |
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143 | const rtems_unsigned32 size, |
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144 | rtems_unsigned32& count) |
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145 | { |
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146 | return set_status_code(rtems_message_queue_broadcast(id, |
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147 | (void*) buffer, |
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148 | size, |
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149 | &count)); |
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150 | } |
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151 | |
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152 | const rtems_status_code rtemsMessageQueue::receive(const void *buffer, |
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153 | rtems_unsigned32& size, |
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154 | rtems_interval micro_secs, |
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155 | bool wait) |
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156 | { |
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157 | rtems_interval usecs = |
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158 | micro_secs && (micro_secs < _TOD_Microseconds_per_tick) ? |
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159 | _TOD_Microseconds_per_tick : micro_secs; |
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160 | return set_status_code(rtems_message_queue_receive(id, |
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161 | (void*) buffer, |
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162 | &size, |
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163 | wait ? RTEMS_WAIT : RTEMS_NO_WAIT, |
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164 | TOD_MICROSECONDS_TO_TICKS(usecs))); |
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165 | } |
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166 | |
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167 | const rtems_status_code rtemsMessageQueue::flush(rtems_unsigned32& count) |
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168 | { |
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169 | return set_status_code(rtems_message_queue_flush(id, &count)); |
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170 | } |
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171 | |
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172 | #endif // _rtemsMessageQueue_h_ |
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173 | |
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174 | |
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175 | |
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176 | |
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