source: rtems/c/src/exec/rtems/src/regiongetsegment.c @ 5aa64518

4.104.114.84.95
Last change on this file since 5aa64518 was 5aa64518, checked in by Joel Sherrill <joel.sherrill@…>, on 05/17/99 at 22:39:20

Split Region Manager into one routine per file.

  • Property mode set to 100644
File size: 2.9 KB
Line 
1/*
2 *  Region Manager
3 *
4 *
5 *  COPYRIGHT (c) 1989-1998.
6 *  On-Line Applications Research Corporation (OAR).
7 *  Copyright assigned to U.S. Government, 1994.
8 *
9 *  The license and distribution terms for this file may be
10 *  found in the file LICENSE in this distribution or at
11 *  http://www.OARcorp.com/rtems/license.html.
12 *
13 *  $Id$
14 */
15
16#include <rtems/system.h>
17#include <rtems/rtems/status.h>
18#include <rtems/rtems/support.h>
19#include <rtems/score/object.h>
20#include <rtems/rtems/options.h>
21#include <rtems/rtems/region.h>
22#include <rtems/score/states.h>
23#include <rtems/score/thread.h>
24
25/*PAGE
26 *
27 *  rtems_region_get_segment
28 *
29 *  This directive will obtain a segment from the given region.
30 *
31 *  Input parameters:
32 *    id         - region id
33 *    size       - segment size in bytes
34 *    option_set - wait option
35 *    timeout    - number of ticks to wait (0 means wait forever)
36 *    segment    - pointer to segment address
37 *
38 *  Output parameters:
39 *    segment    - pointer to segment address filled in
40 *    RTEMS_SUCCESSFUL - if successful
41 *    error code - if unsuccessful
42 */
43
44rtems_status_code rtems_region_get_segment(
45  Objects_Id         id,
46  unsigned32         size,
47  rtems_option       option_set,
48  rtems_interval     timeout,
49  void              **segment
50)
51{
52  register Region_Control *the_region;
53  Objects_Locations        location;
54  Thread_Control          *executing;
55  void                    *the_segment;
56
57  *segment = NULL;
58
59  if ( size == 0 )
60    return RTEMS_INVALID_SIZE;
61
62  executing  = _Thread_Executing;
63  the_region = _Region_Get( id, &location );
64  switch ( location ) {
65    case OBJECTS_REMOTE:        /* this error cannot be returned */
66      return RTEMS_INTERNAL_ERROR;
67
68    case OBJECTS_ERROR:
69      return RTEMS_INVALID_ID;
70
71    case OBJECTS_LOCAL:
72      if ( size > the_region->maximum_segment_size ) {
73        _Thread_Enable_dispatch();
74        return RTEMS_INVALID_SIZE;
75      }
76
77      _Region_Debug_Walk( the_region, 1 );
78
79      the_segment = _Region_Allocate_segment( the_region, size );
80
81      _Region_Debug_Walk( the_region, 2 );
82
83      if ( the_segment ) {
84        the_region->number_of_used_blocks += 1;
85        _Thread_Enable_dispatch();
86        *segment = the_segment;
87        return RTEMS_SUCCESSFUL;
88      }
89
90      if ( _Options_Is_no_wait( option_set ) ) {
91        _Thread_Enable_dispatch();
92        return RTEMS_UNSATISFIED;
93      }
94
95      executing->Wait.queue           = &the_region->Wait_queue;
96      executing->Wait.id              = id;
97      executing->Wait.count           = size;
98      executing->Wait.return_argument = (unsigned32 *) segment;
99
100      _Thread_queue_Enter_critical_section( &the_region->Wait_queue );
101
102      _Thread_queue_Enqueue( &the_region->Wait_queue, timeout );
103
104      _Thread_Enable_dispatch();
105      return (rtems_status_code) executing->Wait.return_code;
106  }
107
108  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
109}
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