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) 1989-1998. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * Copyright assigned to U.S. Government, 1994. |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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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/score/sysstate.h> |
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18 | #include <rtems/score/chain.h> |
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19 | #include <rtems/score/isr.h> |
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20 | #include <rtems/score/coremsg.h> |
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21 | #include <rtems/score/object.h> |
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22 | #include <rtems/score/states.h> |
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23 | #include <rtems/score/thread.h> |
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24 | #include <rtems/score/wkspace.h> |
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25 | #if defined(RTEMS_MULTIPROCESSING) |
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26 | #include <rtems/score/mpci.h> |
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27 | #endif |
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28 | #include <rtems/rtems/status.h> |
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29 | #include <rtems/rtems/attr.h> |
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30 | #include <rtems/rtems/message.h> |
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31 | #include <rtems/rtems/options.h> |
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32 | #include <rtems/rtems/support.h> |
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33 | |
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34 | /*PAGE |
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35 | * |
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36 | * rtems_message_queue_get_number_pending |
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37 | * |
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38 | * This directive returns the number of messages pending. |
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39 | * |
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40 | * Input parameters: |
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41 | * id - queue id |
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42 | * count - return area for count |
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43 | * |
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44 | * Output parameters: |
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45 | * count - number of messages removed ( 0 = empty queue ) |
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46 | * RTEMS_SUCCESSFUL - if successful |
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47 | * error code - if unsuccessful |
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48 | */ |
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49 | |
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50 | rtems_status_code rtems_message_queue_get_number_pending( |
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51 | Objects_Id id, |
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52 | unsigned32 *count |
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53 | ) |
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54 | { |
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55 | register Message_queue_Control *the_message_queue; |
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56 | Objects_Locations location; |
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57 | |
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58 | the_message_queue = _Message_queue_Get( id, &location ); |
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59 | switch ( location ) { |
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60 | case OBJECTS_REMOTE: |
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61 | #if defined(RTEMS_MULTIPROCESSING) |
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62 | _Thread_Executing->Wait.return_argument = count; |
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63 | |
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64 | return _Message_queue_MP_Send_request_packet( |
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65 | MESSAGE_QUEUE_MP_GET_NUMBER_PENDING_REQUEST, |
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66 | id, |
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67 | 0, /* buffer not used */ |
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68 | 0, /* size */ |
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69 | 0, /* option_set not used */ |
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70 | MPCI_DEFAULT_TIMEOUT |
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71 | ); |
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72 | #endif |
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73 | |
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74 | case OBJECTS_ERROR: |
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75 | return RTEMS_INVALID_ID; |
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76 | |
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77 | case OBJECTS_LOCAL: |
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78 | *count = the_message_queue->message_queue.number_of_pending_messages; |
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79 | _Thread_Enable_dispatch(); |
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80 | return RTEMS_SUCCESSFUL; |
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81 | } |
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82 | |
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83 | return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ |
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84 | } |
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