1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @ingroup ScoreFreechain |
---|
5 | * |
---|
6 | * @brief Freechain Handler Implementation |
---|
7 | */ |
---|
8 | |
---|
9 | /* |
---|
10 | * Copyright (c) 2013 Gedare Bloom. |
---|
11 | * |
---|
12 | * The license and distribution terms for this file may be |
---|
13 | * found in the file LICENSE in this distribution or at |
---|
14 | * http://www.rtems.org/license/LICENSE. |
---|
15 | */ |
---|
16 | |
---|
17 | #if HAVE_CONFIG_H |
---|
18 | #include "config.h" |
---|
19 | #endif |
---|
20 | |
---|
21 | #include <rtems/score/freechain.h> |
---|
22 | #include <rtems/score/assert.h> |
---|
23 | #include <rtems/score/chainimpl.h> |
---|
24 | |
---|
25 | void _Freechain_Initialize( |
---|
26 | Freechain_Control *freechain, |
---|
27 | Freechain_Allocator allocator, |
---|
28 | size_t number_nodes, |
---|
29 | size_t node_size |
---|
30 | ) |
---|
31 | { |
---|
32 | void *starting_address; |
---|
33 | |
---|
34 | if ( number_nodes > 0 ) { |
---|
35 | starting_address = ( *allocator )( number_nodes * node_size ); |
---|
36 | number_nodes *= ( starting_address != NULL ); |
---|
37 | } else { |
---|
38 | starting_address = NULL; |
---|
39 | } |
---|
40 | |
---|
41 | _Chain_Initialize( |
---|
42 | &freechain->Free, |
---|
43 | starting_address, |
---|
44 | number_nodes, |
---|
45 | node_size |
---|
46 | ); |
---|
47 | } |
---|
48 | |
---|
49 | void *_Freechain_Get( |
---|
50 | Freechain_Control *freechain, |
---|
51 | Freechain_Allocator allocator, |
---|
52 | size_t number_nodes_to_extend, |
---|
53 | size_t node_size |
---|
54 | ) |
---|
55 | { |
---|
56 | _Assert( node_size >= sizeof( Chain_Node ) ); |
---|
57 | |
---|
58 | if ( _Chain_Is_empty( &freechain->Free ) && number_nodes_to_extend > 0 ) { |
---|
59 | void *starting_address; |
---|
60 | |
---|
61 | starting_address = ( *allocator )( number_nodes_to_extend * node_size ); |
---|
62 | number_nodes_to_extend *= ( starting_address != NULL ); |
---|
63 | |
---|
64 | _Chain_Initialize( |
---|
65 | &freechain->Free, |
---|
66 | starting_address, |
---|
67 | number_nodes_to_extend, |
---|
68 | node_size |
---|
69 | ); |
---|
70 | } |
---|
71 | |
---|
72 | return _Chain_Get_unprotected( &freechain->Free ); |
---|
73 | } |
---|
74 | |
---|
75 | void _Freechain_Put( Freechain_Control *freechain, void *node ) |
---|
76 | { |
---|
77 | if ( node != NULL ) { |
---|
78 | _Chain_Initialize_node( node ); |
---|
79 | _Chain_Prepend_unprotected( &freechain->Free, node ); |
---|
80 | } |
---|
81 | } |
---|