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
|
/**
* @file
*
* @ingroup ScoreFreechain
*
* @brief Freechain Handler Implementation
*/
/*
* Copyright (c) 2013 Gedare Bloom.
*
* 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/freechain.h>
#include <rtems/score/assert.h>
#include <rtems/score/chainimpl.h>
void _Freechain_Initialize(
Freechain_Control *freechain,
Freechain_Allocator allocator,
size_t number_nodes,
size_t node_size
)
{
void *starting_address;
if ( number_nodes > 0 ) {
starting_address = ( *allocator )( number_nodes * node_size );
number_nodes *= ( starting_address != NULL );
} else {
starting_address = NULL;
}
_Chain_Initialize(
&freechain->Free,
starting_address,
number_nodes,
node_size
);
}
void *_Freechain_Get(
Freechain_Control *freechain,
Freechain_Allocator allocator,
size_t number_nodes_to_extend,
size_t node_size
)
{
_Assert( node_size >= sizeof( Chain_Node ) );
if ( _Chain_Is_empty( &freechain->Free ) && number_nodes_to_extend > 0 ) {
void *starting_address;
starting_address = ( *allocator )( number_nodes_to_extend * node_size );
number_nodes_to_extend *= ( starting_address != NULL );
_Chain_Initialize(
&freechain->Free,
starting_address,
number_nodes_to_extend,
node_size
);
}
return _Chain_Get_unprotected( &freechain->Free );
}
void _Freechain_Put( Freechain_Control *freechain, void *node )
{
if ( node != NULL ) {
_Chain_Initialize_node( node );
_Chain_Prepend_unprotected( &freechain->Free, node );
}
}
|