blob: 07a31c011e1865649346c5be236984fece41dd85 (
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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/*
* Region Manager
*
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <rtems/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/score/object.h>
#include <rtems/rtems/options.h>
#include <rtems/rtems/region.h>
#include <rtems/score/states.h>
#include <rtems/score/thread.h>
/*PAGE
*
* rtems_region_get_segment
*
* This directive will obtain a segment from the given region.
*
* Input parameters:
* id - region id
* size - segment size in bytes
* option_set - wait option
* timeout - number of ticks to wait (0 means wait forever)
* segment - pointer to segment address
*
* Output parameters:
* segment - pointer to segment address filled in
* RTEMS_SUCCESSFUL - if successful
* error code - if unsuccessful
*/
rtems_status_code rtems_region_get_segment(
Objects_Id id,
unsigned32 size,
rtems_option option_set,
rtems_interval timeout,
void **segment
)
{
register Region_Control *the_region;
Objects_Locations location;
Thread_Control *executing;
void *the_segment;
*segment = NULL;
if ( size == 0 )
return RTEMS_INVALID_SIZE;
executing = _Thread_Executing;
the_region = _Region_Get( id, &location );
switch ( location ) {
case OBJECTS_REMOTE: /* this error cannot be returned */
return RTEMS_INTERNAL_ERROR;
case OBJECTS_ERROR:
return RTEMS_INVALID_ID;
case OBJECTS_LOCAL:
if ( size > the_region->maximum_segment_size ) {
_Thread_Enable_dispatch();
return RTEMS_INVALID_SIZE;
}
_Region_Debug_Walk( the_region, 1 );
the_segment = _Region_Allocate_segment( the_region, size );
_Region_Debug_Walk( the_region, 2 );
if ( the_segment ) {
the_region->number_of_used_blocks += 1;
_Thread_Enable_dispatch();
*segment = the_segment;
return RTEMS_SUCCESSFUL;
}
if ( _Options_Is_no_wait( option_set ) ) {
_Thread_Enable_dispatch();
return RTEMS_UNSATISFIED;
}
executing->Wait.queue = &the_region->Wait_queue;
executing->Wait.id = id;
executing->Wait.count = size;
executing->Wait.return_argument = (unsigned32 *) segment;
_Thread_queue_Enter_critical_section( &the_region->Wait_queue );
_Thread_queue_Enqueue( &the_region->Wait_queue, timeout );
_Thread_Enable_dispatch();
return (rtems_status_code) executing->Wait.return_code;
}
return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */
}
|
