4.104.114.84.95
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1 | /* Shm_Receive_packet |
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2 | * |
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3 | * This routine is the shared memory locked queue MPCI driver routine |
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4 | * used to obtain a packet containing a message from this node's |
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5 | * receive queue. |
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6 | * |
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7 | * Input parameters: |
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8 | * packet - address of a pointer to a packet |
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9 | * |
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10 | * Output parameters: |
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11 | * *(rpb->packet) - pointer to packet |
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12 | * NULL if no packet currently available |
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13 | * |
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14 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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15 | * On-Line Applications Research Corporation (OAR). |
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16 | * All rights assigned to U.S. Government, 1994. |
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17 | * |
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18 | * This material may be reproduced by or for the U.S. Government pursuant |
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19 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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20 | * notice must appear in all copies of this file and its derivatives. |
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21 | * |
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22 | * $Id$ |
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23 | */ |
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24 | |
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25 | #include <rtems.h> |
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26 | #include "shm.h" |
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27 | |
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28 | rtems_mpci_entry Shm_Receive_packet( |
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29 | rtems_packet_prefix **packet |
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30 | ) |
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31 | { |
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32 | Shm_Envelope_control *ecb; |
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33 | |
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34 | ecb = Shm_Locked_queue_Get( Shm_Local_receive_queue ); |
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35 | if ( ecb ) { |
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36 | *(packet) = Shm_Envelope_control_to_packet_prefix_pointer( ecb ); |
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37 | if ( ecb->Preamble.endian != Shm_Configuration->format ) |
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38 | Shm_Convert_packet( *packet ); |
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39 | Shm_Receive_message_count++; |
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40 | } else { |
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41 | *(packet) = NULL; |
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42 | Shm_Null_message_count++; |
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43 | } |
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44 | } |
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