source: rtems/cpukit/rtems/src/regiongetsegment.c @ fe6c170c

4.115
Last change on this file since fe6c170c was fe6c170c, checked in by Sebastian Huber <sebastian.huber@…>, on 07/24/13 at 14:19:52

score: Create states implementation header

Move implementation specific parts of states.h and states.inl into new
header file statesimpl.h. The states.h contains now only the
application visible API.

  • Property mode set to 100644
File size: 3.0 KB
Line 
1/**
2 *  @file
3 *
4 *  @brief RTEMS Get Region Segment
5 *  @ingroup ClassicRegion
6 */
7
8/*
9 *  COPYRIGHT (c) 1989-2007.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.rtems.com/license/LICENSE.
15 */
16
17#if HAVE_CONFIG_H
18#include "config.h"
19#endif
20
21#include <rtems/system.h>
22#include <rtems/rtems/status.h>
23#include <rtems/rtems/support.h>
24#include <rtems/score/object.h>
25#include <rtems/rtems/optionsimpl.h>
26#include <rtems/rtems/regionimpl.h>
27#include <rtems/score/thread.h>
28#include <rtems/score/apimutex.h>
29
30rtems_status_code rtems_region_get_segment(
31  rtems_id           id,
32  uintptr_t          size,
33  rtems_option       option_set,
34  rtems_interval     timeout,
35  void              **segment
36)
37{
38  Thread_Control     *executing;
39  Objects_Locations   location;
40  rtems_status_code   return_status;
41  Region_Control     *the_region;
42  void               *the_segment;
43
44  if ( !segment )
45    return RTEMS_INVALID_ADDRESS;
46
47  *segment = NULL;
48
49  if ( size == 0 )
50    return RTEMS_INVALID_SIZE;
51
52  _RTEMS_Lock_allocator();
53
54    executing  = _Thread_Executing;
55    the_region = _Region_Get( id, &location );
56    switch ( location ) {
57
58      case OBJECTS_LOCAL:
59        if ( size > the_region->maximum_segment_size )
60          return_status = RTEMS_INVALID_SIZE;
61
62        else {
63          _Region_Debug_Walk( the_region, 1 );
64
65          the_segment = _Region_Allocate_segment( the_region, size );
66
67          _Region_Debug_Walk( the_region, 2 );
68
69          if ( the_segment ) {
70            the_region->number_of_used_blocks += 1;
71            *segment = the_segment;
72            return_status = RTEMS_SUCCESSFUL;
73          } else if ( _Options_Is_no_wait( option_set ) ) {
74            return_status = RTEMS_UNSATISFIED;
75          } else {
76            /*
77             *  Switch from using the memory allocation mutex to using a
78             *  dispatching disabled critical section.  We have to do this
79             *  because this thread is going to block.
80             */
81            /* FIXME: Lock order reversal */
82            _Thread_Disable_dispatch();
83            _RTEMS_Unlock_allocator();
84
85            executing->Wait.queue           = &the_region->Wait_queue;
86            executing->Wait.id              = id;
87            executing->Wait.count           = size;
88            executing->Wait.return_argument = segment;
89
90            _Thread_queue_Enter_critical_section( &the_region->Wait_queue );
91
92            _Thread_queue_Enqueue( &the_region->Wait_queue, timeout );
93
94            _Objects_Put( &the_region->Object );
95
96            return (rtems_status_code) executing->Wait.return_code;
97          }
98        }
99        break;
100
101#if defined(RTEMS_MULTIPROCESSING)
102      case OBJECTS_REMOTE:        /* this error cannot be returned */
103        break;
104#endif
105
106      case OBJECTS_ERROR:
107      default:
108        return_status = RTEMS_INVALID_ID;
109        break;
110    }
111
112  _RTEMS_Unlock_allocator();
113  return return_status;
114}
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