source: rtems/cpukit/rtems/src/regionreturnsegment.c @ 4bf1801

4.104.114.84.95
Last change on this file since 4bf1801 was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on 11/17/99 at 17:51:34

Updated copyright notice.

  • Property mode set to 100644
File size: 2.9 KB
Line 
1/*
2 *  Region Manager
3 *
4 *
5 *  COPYRIGHT (c) 1989-1999.
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.OARcorp.com/rtems/license.html.
11 *
12 *  $Id$
13 */
14
15#ifdef RTEMS_REGION_SHRED_ON_FREE
16#include <string.h>
17
18#ifndef RTEMS_REGION_FREE_SHRED_PATTERN
19#define RTEMS_REGION_FREE_SHRED_PATTERN 0x00
20#endif
21#endif
22
23#include <rtems/system.h>
24#include <rtems/rtems/status.h>
25#include <rtems/rtems/support.h>
26#include <rtems/score/object.h>
27#include <rtems/rtems/options.h>
28#include <rtems/rtems/region.h>
29#include <rtems/score/states.h>
30#include <rtems/score/thread.h>
31
32/*PAGE
33 *
34 *  rtems_region_return_segment
35 *
36 *  This directive will return a segment to its region.
37 *
38 *  Input parameters:
39 *    id      - region id
40 *    segment - pointer to segment address
41 *
42 *  Output parameters:
43 *    RTEMS_SUCCESSFUL - if successful
44 *    error code        - if unsuccessful
45 */
46
47rtems_status_code rtems_region_return_segment(
48  Objects_Id  id,
49  void       *segment
50)
51{
52  register Region_Control *the_region;
53  Thread_Control          *the_thread;
54  Objects_Locations        location;
55  void                   **the_segment;
56#ifdef RTEMS_REGION_FREE_SHRED_PATTERN
57  unsigned32               size;
58#endif
59  int                      status;
60
61  the_region = _Region_Get( id, &location );
62  switch ( location ) {
63
64    case OBJECTS_REMOTE:        /* this error cannot be returned */
65      return RTEMS_INTERNAL_ERROR;
66
67    case OBJECTS_ERROR:
68      return RTEMS_INVALID_ID;
69
70    case OBJECTS_LOCAL:
71
72      _Region_Debug_Walk( the_region, 3 );
73
74#ifdef RTEMS_REGION_FREE_SHRED_PATTERN
75      if ( _Heap_Size_of_user_area( &the_region->Memory, segment, size ) ) {
76        memset(segment, (RTEMS_REGION_FREE_SHRED_PATTERN & 0xFF), size);
77      } else {
78        _Thread_Enable_dispatch();
79        return RTEMS_INVALID_ADDRESS;
80      }
81#endif
82
83      status = _Region_Free_segment( the_region, segment );
84
85      _Region_Debug_Walk( the_region, 4 );
86
87      if ( !status ) {
88        _Thread_Enable_dispatch();
89        return RTEMS_INVALID_ADDRESS;
90      }
91
92      the_region->number_of_used_blocks -= 1;
93      for ( ; ; ) {
94        the_thread = _Thread_queue_First( &the_region->Wait_queue );
95
96        if ( the_thread == NULL )
97           break;
98
99        the_segment = (void **) _Region_Allocate_segment(
100           the_region,
101           the_thread->Wait.count
102        );
103
104        if ( the_segment == NULL )
105           break;
106
107        *(void **)the_thread->Wait.return_argument = the_segment;
108        the_region->number_of_used_blocks += 1;
109        _Thread_queue_Extract( &the_region->Wait_queue, the_thread );
110        the_thread->Wait.return_code = RTEMS_SUCCESSFUL;
111      }
112
113      _Thread_Enable_dispatch();
114      return RTEMS_SUCCESSFUL;
115  }
116
117  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
118}
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