1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief CORE Message Queue Submit |
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5 | * |
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6 | * @ingroup ScoreMessageQueue |
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7 | */ |
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8 | |
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9 | /* |
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10 | * COPYRIGHT (c) 1989-2009. |
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11 | * On-Line Applications Research Corporation (OAR). |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.org/license/LICENSE. |
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16 | */ |
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17 | |
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18 | #if HAVE_CONFIG_H |
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19 | #include "config.h" |
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20 | #endif |
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21 | |
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22 | #include <rtems/score/coremsgimpl.h> |
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23 | #include <rtems/score/objectimpl.h> |
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24 | #include <rtems/score/isr.h> |
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25 | #include <rtems/score/threadimpl.h> |
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26 | #include <rtems/score/statesimpl.h> |
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27 | #include <rtems/score/wkspace.h> |
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28 | |
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29 | Status_Control _CORE_message_queue_Submit( |
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30 | CORE_message_queue_Control *the_message_queue, |
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31 | Thread_Control *executing, |
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32 | const void *buffer, |
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33 | size_t size, |
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34 | CORE_message_queue_Submit_types submit_type, |
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35 | bool wait, |
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36 | Thread_queue_Context *queue_context |
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37 | ) |
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38 | { |
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39 | CORE_message_queue_Buffer_control *the_message; |
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40 | Thread_Control *the_thread; |
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41 | |
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42 | if ( size > the_message_queue->maximum_message_size ) { |
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43 | _CORE_message_queue_Release( the_message_queue, queue_context ); |
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44 | return STATUS_MESSAGE_INVALID_SIZE; |
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45 | } |
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46 | |
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47 | /* |
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48 | * Is there a thread currently waiting on this message queue? |
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49 | */ |
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50 | |
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51 | the_thread = _CORE_message_queue_Dequeue_receiver( |
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52 | the_message_queue, |
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53 | buffer, |
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54 | size, |
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55 | submit_type, |
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56 | queue_context |
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57 | ); |
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58 | if ( the_thread != NULL ) { |
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59 | return STATUS_SUCCESSFUL; |
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60 | } |
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61 | |
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62 | /* |
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63 | * No one waiting on the message queue at this time, so attempt to |
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64 | * queue the message up for a future receive. |
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65 | */ |
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66 | the_message = |
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67 | _CORE_message_queue_Allocate_message_buffer( the_message_queue ); |
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68 | if ( the_message ) { |
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69 | _CORE_message_queue_Insert_message( |
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70 | the_message_queue, |
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71 | the_message, |
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72 | buffer, |
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73 | size, |
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74 | submit_type |
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75 | ); |
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76 | |
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77 | #if defined(RTEMS_SCORE_COREMSG_ENABLE_NOTIFICATION) |
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78 | /* |
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79 | * According to POSIX, does this happen before or after the message |
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80 | * is actually enqueued. It is logical to think afterwards, because |
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81 | * the message is actually in the queue at this point. |
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82 | */ |
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83 | if ( |
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84 | the_message_queue->number_of_pending_messages == 1 |
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85 | && the_message_queue->notify_handler != NULL |
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86 | ) { |
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87 | ( *the_message_queue->notify_handler )( |
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88 | the_message_queue, |
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89 | queue_context |
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90 | ); |
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91 | } else { |
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92 | _CORE_message_queue_Release( the_message_queue, queue_context ); |
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93 | } |
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94 | #else |
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95 | _CORE_message_queue_Release( the_message_queue, queue_context ); |
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96 | #endif |
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97 | |
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98 | return STATUS_SUCCESSFUL; |
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99 | } |
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100 | |
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101 | #if !defined(RTEMS_SCORE_COREMSG_ENABLE_BLOCKING_SEND) |
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102 | _CORE_message_queue_Release( the_message_queue, queue_context ); |
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103 | return STATUS_TOO_MANY; |
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104 | #else |
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105 | /* |
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106 | * No message buffers were available so we may need to return an |
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107 | * overflow error or block the sender until the message is placed |
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108 | * on the queue. |
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109 | */ |
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110 | if ( !wait ) { |
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111 | _CORE_message_queue_Release( the_message_queue, queue_context ); |
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112 | return STATUS_TOO_MANY; |
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113 | } |
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114 | |
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115 | /* |
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116 | * Do NOT block on a send if the caller is in an ISR. It is |
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117 | * deadly to block in an ISR. |
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118 | */ |
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119 | if ( _ISR_Is_in_progress() ) { |
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120 | _CORE_message_queue_Release( the_message_queue, queue_context ); |
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121 | return STATUS_MESSAGE_QUEUE_WAIT_IN_ISR; |
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122 | } |
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123 | |
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124 | /* |
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125 | * WARNING!! executing should NOT be used prior to this point. |
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126 | * Thus the unusual choice to open a new scope and declare |
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127 | * it as a variable. Doing this emphasizes how dangerous it |
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128 | * would be to use this variable prior to here. |
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129 | */ |
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130 | executing->Wait.return_argument_second.immutable_object = buffer; |
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131 | executing->Wait.option = (uint32_t) size; |
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132 | executing->Wait.count = submit_type; |
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133 | |
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134 | _Thread_queue_Context_set_thread_state( |
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135 | queue_context, |
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136 | STATES_WAITING_FOR_MESSAGE |
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137 | ); |
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138 | _Thread_queue_Enqueue( |
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139 | &the_message_queue->Wait_queue.Queue, |
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140 | the_message_queue->operations, |
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141 | executing, |
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142 | queue_context |
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143 | ); |
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144 | return _Thread_Wait_get_status( executing ); |
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145 | #endif |
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146 | } |
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