blob: 57d38f47bd1b4471def856b3fb52d17ed64031b0 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/**
* @file
*
* @brief Object Acquire
*
* @ingroup ScoreObject
*/
/*
* Copyright (c) 2015 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/objectimpl.h>
Objects_Control *_Objects_Acquire(
const Objects_Information *information,
Objects_Id id,
Objects_Locations *location,
ISR_lock_Context *lock_context
)
{
Objects_Control *the_object;
uint32_t index;
index = id - information->minimum_id + 1;
if ( information->maximum >= index ) {
/*
* On uni-processor configurations we disable interrupts before we use the
* local table. This prevents use of freed memory in case the object
* information is extended in between. On SMP configurations bad things
* can happen, see https://devel.rtems.org/ticket/2280.
*/
#if !defined(RTEMS_SMP)
ISR_Level level;
_ISR_Disable( level );
#endif
if ( ( the_object = information->local_table[ index ] ) != NULL ) {
*location = OBJECTS_LOCAL;
#if defined(RTEMS_SMP)
_ISR_lock_ISR_disable_and_acquire( &the_object->Lock, lock_context );
#else
lock_context->isr_level = level;
#endif
return the_object;
}
#if !defined(RTEMS_SMP)
_ISR_Enable( level );
#endif
*location = OBJECTS_ERROR;
return NULL;
}
*location = OBJECTS_ERROR;
#if defined(RTEMS_MULTIPROCESSING)
_Objects_MP_Is_remote( information, id, location, &the_object );
return the_object;
#else
return NULL;
#endif
}
|
