1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief rtems_message_queue_flush |
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5 | * @ingroup ClassicMessageQueue Message Queues |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2007. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.com/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/system.h> |
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22 | #include <rtems/score/chain.h> |
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23 | #include <rtems/score/isr.h> |
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24 | #include <rtems/score/coremsgimpl.h> |
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25 | #include <rtems/score/thread.h> |
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26 | #include <rtems/score/wkspace.h> |
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27 | #include <rtems/rtems/status.h> |
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28 | #include <rtems/rtems/attrimpl.h> |
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29 | #include <rtems/rtems/messageimpl.h> |
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30 | #include <rtems/rtems/options.h> |
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31 | #include <rtems/rtems/support.h> |
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32 | |
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33 | /* |
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34 | * rtems_message_queue_flush |
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35 | * |
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36 | * This directive removes all pending messages from a queue and returns |
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37 | * the number of messages removed. If no messages were present then |
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38 | * a count of zero is returned. |
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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_flush( |
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51 | rtems_id id, |
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52 | uint32_t *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 | if ( !count ) |
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59 | return RTEMS_INVALID_ADDRESS; |
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60 | |
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61 | the_message_queue = _Message_queue_Get( id, &location ); |
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62 | switch ( location ) { |
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63 | |
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64 | case OBJECTS_LOCAL: |
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65 | *count = _CORE_message_queue_Flush( &the_message_queue->message_queue ); |
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66 | _Objects_Put( &the_message_queue->Object ); |
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67 | return RTEMS_SUCCESSFUL; |
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68 | |
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69 | #if defined(RTEMS_MULTIPROCESSING) |
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70 | case OBJECTS_REMOTE: |
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71 | _Thread_Executing->Wait.return_argument = count; |
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72 | |
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73 | return |
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74 | _Message_queue_MP_Send_request_packet( |
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75 | MESSAGE_QUEUE_MP_FLUSH_REQUEST, |
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76 | id, |
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77 | 0, /* buffer not used */ |
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78 | 0, /* size */ |
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79 | 0, /* option_set not used */ |
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80 | MPCI_DEFAULT_TIMEOUT |
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81 | ); |
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82 | #endif |
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83 | |
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84 | case OBJECTS_ERROR: |
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85 | break; |
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86 | } |
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87 | |
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88 | return RTEMS_INVALID_ID; |
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89 | } |
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