source: rtems/cpukit/posix/src/mqueuecreatesupp.c @ 4dc89814

4.104.114.84.95
Last change on this file since 4dc89814 was 4dc89814, checked in by Joel Sherrill <joel.sherrill@…>, on Nov 2, 1999 at 5:00:35 PM

Split mqueue.c into a variety of files.

  • Property mode set to 100644
File size: 3.6 KB
Line 
1/*
2 *  NOTE:  The structure of the routines is identical to that of POSIX
3 *         Message_queues to leave the option of having unnamed message
4 *         queues at a future date.  They are currently not part of the
5 *         POSIX standard but unnamed message_queues are.  This is also
6 *         the reason for the apparently unnecessary tracking of
7 *         the process_shared attribute.  [In addition to the fact that
8 *         it would be trivial to add pshared to the mq_attr structure
9 *         and have process private message queues.]
10 *
11 *         This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open
12 *         time.
13 *
14 *  $Id$
15 */
16
17#include <stdarg.h>
18
19#include <pthread.h>
20#include <limits.h>
21#include <errno.h>
22#include <fcntl.h>
23#include <mqueue.h>
24
25#include <rtems/system.h>
26#include <rtems/score/watchdog.h>
27#include <rtems/posix/seterr.h>
28#include <rtems/posix/mqueue.h>
29#include <rtems/posix/time.h>
30
31/*PAGE
32 *
33 *  _POSIX_Message_queue_Create_support
34 */
35 
36int _POSIX_Message_queue_Create_support(
37  const char                    *name,
38  int                            pshared,
39  unsigned int                   oflag,
40  struct mq_attr                *attr,
41  POSIX_Message_queue_Control  **message_queue
42)
43{
44  POSIX_Message_queue_Control   *the_mq;
45 
46  _Thread_Disable_dispatch();
47 
48  the_mq = _POSIX_Message_queue_Allocate();
49 
50  if ( !the_mq ) {
51    _Thread_Enable_dispatch();
52    set_errno_and_return_minus_one( ENFILE );
53  }
54 
55#if defined(RTEMS_MULTIPROCESSING)
56  if ( pshared == PTHREAD_PROCESS_SHARED &&
57       !( _Objects_MP_Allocate_and_open( &_POSIX_Message_queue_Information, 0,
58                            the_mq->Object.id, FALSE ) ) ) {
59    _POSIX_Message_queue_Free( the_mq );
60    _Thread_Enable_dispatch();
61    set_errno_and_return_minus_one( ENFILE );
62  }
63#endif
64 
65  the_mq->process_shared  = pshared;
66 
67  if ( name ) {
68    the_mq->named = TRUE;
69    the_mq->open_count = 1;
70    the_mq->linked = TRUE;
71  }
72  else
73    the_mq->named = FALSE;
74 
75  if ( oflag & O_NONBLOCK ) 
76    the_mq->blocking = FALSE;
77  else
78    the_mq->blocking = TRUE;
79 
80  /* XXX
81   *
82   *  Note that this should be based on the current scheduling policy.
83   */
84
85  /* XXX
86   *
87   *  Message and waiting disciplines are not distinguished.
88   */
89/*
90  the_mq_attr->message_discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO;
91  the_mq_attr->waiting_discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO;
92 */
93
94  the_mq->Message_queue.Attributes.discipline =
95                                         CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO;
96 
97  if ( ! _CORE_message_queue_Initialize(
98           &the_mq->Message_queue,
99           OBJECTS_POSIX_MESSAGE_QUEUES,
100           &the_mq->Message_queue.Attributes,
101           attr->mq_maxmsg,
102           attr->mq_msgsize,
103#if defined(RTEMS_MULTIPROCESSING)
104           _POSIX_Message_queue_MP_Send_extract_proxy
105#else
106           NULL
107#endif
108      ) ) {
109
110#if defined(RTEMS_MULTIPROCESSING)
111    if ( pshared == PTHREAD_PROCESS_SHARED )
112      _Objects_MP_Close( &_POSIX_Message_queue_Information, the_mq->Object.id );
113#endif
114 
115    _POSIX_Message_queue_Free( the_mq );
116    _Thread_Enable_dispatch();
117    set_errno_and_return_minus_one( ENOSPC );
118  }
119
120 
121  /* XXX - need Names to be a string!!! */
122  _Objects_Open(
123    &_POSIX_Message_queue_Information,
124    &the_mq->Object,
125    (char *) name
126  );
127 
128  *message_queue = the_mq;
129 
130#if defined(RTEMS_MULTIPROCESSING)
131  if ( pshared == PTHREAD_PROCESS_SHARED )
132    _POSIX_Message_queue_MP_Send_process_packet(
133      POSIX_MESSAGE_QUEUE_MP_ANNOUNCE_CREATE,
134      the_mq->Object.id,
135      (char *) name,
136      0                          /* Not used */
137    );
138#endif
139 
140  _Thread_Enable_dispatch();
141  return 0;
142}
143
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