source: rtems/cpukit/rtems/src/msgqreceive.c @ ebe61382

4.104.114.95
Last change on this file since ebe61382 was ebe61382, checked in by Joel Sherrill <joel.sherrill@…>, on 11/30/07 at 21:49:41

2007-11-30 Joel Sherrill <joel.sherrill@…>

  • rtems/src/barrierdelete.c, rtems/src/barrierrelease.c, rtems/src/barriertranslatereturncode.c, rtems/src/barrierwait.c, rtems/src/clockget.c, rtems/src/dpmemdelete.c, rtems/src/dpmemexternal2internal.c, rtems/src/dpmeminternal2external.c, rtems/src/eventsend.c, rtems/src/eventtimeout.c, rtems/src/msgqbroadcast.c, rtems/src/msgqdelete.c, rtems/src/msgqflush.c, rtems/src/msgqgetnumberpending.c, rtems/src/msgqreceive.c, rtems/src/msgqsend.c, rtems/src/msgqurgent.c, rtems/src/partdelete.c, rtems/src/partgetbuffer.c, rtems/src/partreturnbuffer.c, rtems/src/ratemoncancel.c, rtems/src/ratemondelete.c, rtems/src/ratemongetstatistics.c, rtems/src/ratemongetstatus.c, rtems/src/ratemonperiod.c, rtems/src/ratemonresetstatistics.c, rtems/src/ratemontimeout.c, rtems/src/semdelete.c, rtems/src/semflush.c, rtems/src/semobtain.c, rtems/src/semrelease.c, rtems/src/semtranslatereturncode.c, rtems/src/signalsend.c, rtems/src/taskdelete.c, rtems/src/taskgetnote.c, rtems/src/taskissuspended.c, rtems/src/taskrestart.c, rtems/src/taskresume.c, rtems/src/tasksetnote.c, rtems/src/tasksetpriority.c, rtems/src/taskstart.c, rtems/src/tasksuspend.c, rtems/src/taskvariableadd.c, rtems/src/taskvariabledelete.c, rtems/src/taskvariableget.c, rtems/src/timercancel.c, rtems/src/timerdelete.c, rtems/src/timerfirewhen.c, rtems/src/timergetinfo.c, rtems/src/timerreset.c, rtems/src/timerserverfireafter.c, rtems/src/timerserverfirewhen.c: Restructured all code with the switch (location) pattern so that OBJECTS_LOCAL is first and we can fall into it and the OBJECTS_ERROR case breaks to a return RTEMS_INVALID_ID. This eliminates the return RTEMS_INTERNAL_ERROR at the bottom of each of these files which was unreachable and untestable code. This resulted in a code savings of approximately 20 bytes per file on the SPARC/ERC32.
  • Property mode set to 100644
File size: 2.6 KB
Line 
1/*
2 *  Message Queue Manager
3 *
4 *
5 *  COPYRIGHT (c) 1989-2007.
6 *  On-Line Applications Research Corporation (OAR).
7 *
8 *  The license and distribution terms for this file may be
9 *  found in the file LICENSE in this distribution or at
10 *  http://www.rtems.com/license/LICENSE.
11 *
12 *  $Id$
13 */
14
15#if HAVE_CONFIG_H
16#include "config.h"
17#endif
18
19#include <rtems/system.h>
20#include <rtems/score/sysstate.h>
21#include <rtems/score/chain.h>
22#include <rtems/score/isr.h>
23#include <rtems/score/coremsg.h>
24#include <rtems/score/object.h>
25#include <rtems/score/states.h>
26#include <rtems/score/thread.h>
27#include <rtems/score/wkspace.h>
28#if defined(RTEMS_MULTIPROCESSING)
29#include <rtems/score/mpci.h>
30#endif
31#include <rtems/rtems/status.h>
32#include <rtems/rtems/attr.h>
33#include <rtems/rtems/message.h>
34#include <rtems/rtems/options.h>
35#include <rtems/rtems/support.h>
36
37/*PAGE
38 *
39 *  rtems_message_queue_receive
40 *
41 *  This directive dequeues a message from the designated message queue
42 *  and copies it into the requesting thread's buffer.
43 *
44 *  Input parameters:
45 *    id         - queue id
46 *    buffer     - pointer to message buffer
47 *    size       - size of message receive
48 *    option_set - options on receive
49 *    timeout    - number of ticks to wait
50 *
51 *  Output parameters:
52 *    RTEMS_SUCCESSFUL - if successful
53 *    error code       - if unsuccessful
54 */
55
56rtems_status_code rtems_message_queue_receive(
57  Objects_Id            id,
58  void                 *buffer,
59  size_t               *size,
60  uint32_t              option_set,
61  rtems_interval        timeout
62)
63{
64  register Message_queue_Control *the_message_queue;
65  Objects_Locations               location;
66  boolean                         wait;
67
68  if ( !buffer )
69    return RTEMS_INVALID_ADDRESS;
70
71  if ( !size )
72    return RTEMS_INVALID_ADDRESS;
73
74  the_message_queue = _Message_queue_Get( id, &location );
75  switch ( location ) {
76
77    case OBJECTS_LOCAL:
78      if ( _Options_Is_no_wait( option_set ) )
79        wait = FALSE;
80      else
81        wait = TRUE;
82
83      _CORE_message_queue_Seize(
84        &the_message_queue->message_queue,
85        the_message_queue->Object.id,
86        buffer,
87        size,
88        wait,
89        timeout
90      );
91      _Thread_Enable_dispatch();
92      return _Message_queue_Translate_core_message_queue_return_code(
93        _Thread_Executing->Wait.return_code
94      );
95
96#if defined(RTEMS_MULTIPROCESSING)
97    case OBJECTS_REMOTE:
98      return _Message_queue_MP_Send_request_packet(
99          MESSAGE_QUEUE_MP_RECEIVE_REQUEST,
100          id,
101          buffer,
102          size,
103          option_set,
104          timeout
105        );
106#endif
107
108    case OBJECTS_ERROR:
109      break;
110  }
111
112  return RTEMS_INVALID_ID;
113}
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