source: rtems/cpukit/rtems/src/regionreturnsegment.c @ e980b219

4.104.114.84.95
Last change on this file since e980b219 was e980b219, checked in by Joel Sherrill <joel.sherrill@…>, on May 6, 2004 at 7:21:40 PM

2004-05-06 Joel Sherrill <joel@…>

PR 618/rtems

  • rtems/include/rtems/rtems/status.h, rtems/src/clockget.c, rtems/src/clockset.c, rtems/src/dpmemcreate.c, rtems/src/dpmemexternal2internal.c, rtems/src/dpmeminternal2external.c, rtems/src/eventmp.c, rtems/src/eventreceive.c, rtems/src/eventsend.c, rtems/src/msgqbroadcast.c, rtems/src/msgqcreate.c, rtems/src/msgqflush.c, rtems/src/msgqgetnumberpending.c, rtems/src/msgqreceive.c, rtems/src/msgqsubmit.c, rtems/src/partcreate.c, rtems/src/partdelete.c, rtems/src/partgetbuffer.c, rtems/src/ratemoncancel.c, rtems/src/ratemoncreate.c, rtems/src/ratemondelete.c, rtems/src/ratemongetstatus.c, rtems/src/ratemonident.c, rtems/src/ratemonperiod.c, rtems/src/regioncreate.c, rtems/src/regiondelete.c, rtems/src/regionextend.c, rtems/src/regiongetsegment.c, rtems/src/regiongetsegmentsize.c, rtems/src/regionreturnsegment.c, rtems/src/semcreate.c, rtems/src/semdelete.c, rtems/src/semflush.c, rtems/src/semident.c, rtems/src/taskcreate.c, rtems/src/taskgetnote.c, rtems/src/taskmode.c, rtems/src/taskrestart.c, rtems/src/taskresume.c, rtems/src/tasksetnote.c, rtems/src/tasksuspend.c, rtems/src/taskvariableadd.c, rtems/src/taskvariabledelete.c, rtems/src/taskvariableget.c, rtems/src/taskwakewhen.c, rtems/src/timercreate.c, rtems/src/timerdelete.c, rtems/src/timerfireafter.c, rtems/src/timerfirewhen.c, rtems/src/timerserverfireafter.c, rtems/src/timerserverfirewhen.c, score/include/rtems/score/object.h, score/src/coretodvalidate.c, score/src/objectnametoid.c: Add NULL checks.
  • Property mode set to 100644
File size: 3.0 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.rtems.com/license/LICENSE.
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#include <rtems/score/apimutex.h>
32
33/*PAGE
34 *
35 *  rtems_region_return_segment
36 *
37 *  This directive will return a segment to its region.
38 *
39 *  Input parameters:
40 *    id      - region id
41 *    segment - pointer to segment address
42 *
43 *  Output parameters:
44 *    RTEMS_SUCCESSFUL - if successful
45 *    error code       - if unsuccessful
46 */
47
48rtems_status_code rtems_region_return_segment(
49  Objects_Id  id,
50  void       *segment
51)
52{
53  register Region_Control *the_region;
54  Thread_Control          *the_thread;
55  Objects_Locations        location;
56  void                   **the_segment;
57#ifdef RTEMS_REGION_FREE_SHRED_PATTERN
58  uint32_t                 size;
59#endif
60  int                      status;
61
62  _RTEMS_Lock_allocator();
63  the_region = _Region_Get( id, &location );
64  switch ( location ) {
65
66    case OBJECTS_REMOTE:        /* this error cannot be returned */
67      _RTEMS_Unlock_allocator();
68      return RTEMS_INTERNAL_ERROR;
69
70    case OBJECTS_ERROR:
71      _RTEMS_Unlock_allocator();
72      return RTEMS_INVALID_ID;
73
74    case OBJECTS_LOCAL:
75
76      _Region_Debug_Walk( the_region, 3 );
77
78#ifdef RTEMS_REGION_FREE_SHRED_PATTERN
79      if ( _Heap_Size_of_user_area( &the_region->Memory, segment, &size ) ) {
80        memset(segment, (RTEMS_REGION_FREE_SHRED_PATTERN & 0xFF), size);
81      } else {
82        _RTEMS_Unlock_allocator();
83        return RTEMS_INVALID_ADDRESS;
84      }
85#endif
86
87      status = _Region_Free_segment( the_region, segment );
88
89      _Region_Debug_Walk( the_region, 4 );
90
91      if ( !status ) {
92        _RTEMS_Unlock_allocator();
93        return RTEMS_INVALID_ADDRESS;
94      }
95
96      the_region->number_of_used_blocks -= 1;
97      for ( ; ; ) {
98        the_thread = _Thread_queue_First( &the_region->Wait_queue );
99
100        if ( the_thread == NULL )
101           break;
102
103        the_segment = (void **) _Region_Allocate_segment(
104           the_region,
105           the_thread->Wait.count
106        );
107
108        if ( the_segment == NULL )
109           break;
110
111        *(void **)the_thread->Wait.return_argument = the_segment;
112        the_region->number_of_used_blocks += 1;
113        _Thread_queue_Extract( &the_region->Wait_queue, the_thread );
114        the_thread->Wait.return_code = RTEMS_SUCCESSFUL;
115      }
116
117      _RTEMS_Unlock_allocator();
118      return RTEMS_SUCCESSFUL;
119  }
120
121  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
122}
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