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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* Copyright (c) 2016 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "object-collection.h"
#include "util.h"
void
object_collection_init(struct object_collection *coll)
{
coll->objs = coll->stub;
coll->n = 0;
coll->capacity = ARRAY_SIZE(coll->stub);
}
void
object_collection_add(struct object_collection *coll, void *obj)
{
if (coll->n >= coll->capacity) {
size_t old_size, new_size;
old_size = coll->capacity * sizeof *coll->objs;
coll->capacity *= 2;
new_size = coll->capacity * sizeof *coll->objs;
if (coll->objs == coll->stub) {
coll->objs = xmalloc(new_size);
memcpy(coll->objs, coll->stub, old_size);
} else {
coll->objs = xrealloc(coll->objs, new_size);
}
}
coll->objs[coll->n++] = obj;
}
void
object_collection_remove(struct object_collection *coll, void *obj)
{
size_t i;
for (i = 0; i < coll->n; i++) {
if (coll->objs[i] == obj) {
break;
}
}
if (i == coll->n) {
return;
}
coll->n--;
/* Swap the last item in if needed. */
if (i != coll->n) {
coll->objs[i] = coll->objs[coll->n];
}
/* Shrink? Watermark at '/ 4' to get hysteresis and leave spare
* capacity. */
if (coll->objs != coll->stub && coll->n <= coll->capacity / 4) {
size_t actual_size, new_size;
actual_size = coll->n * sizeof *coll->objs;
coll->capacity /= 2;
new_size = coll->capacity * sizeof *coll->objs;
if (new_size <= sizeof(coll->stub)) {
memcpy(coll->stub, coll->objs, actual_size);
free(coll->objs);
coll->objs = coll->stub;
} else {
coll->objs = xrealloc(coll->objs, new_size);
}
}
}
void
object_collection_move(struct object_collection *to,
struct object_collection *from)
{
ovs_assert(to->n == 0);
*to = *from;
if (from->objs == from->stub) {
to->objs = to->stub;
}
object_collection_init(from);
}
/* Returns a NULL-terminated array of object pointers,
* destroys 'rules'. */
void *
object_collection_detach(struct object_collection *coll)
{
void **array;
object_collection_add(coll, NULL);
if (coll->objs == coll->stub) {
coll->objs = xmemdup(coll->objs, coll->n * sizeof *coll->objs);
}
array = coll->objs;
object_collection_init(coll);
return array;
}
void
object_collection_destroy(struct object_collection *coll)
{
if (coll->objs != coll->stub) {
free(coll->objs);
}
/* Make repeated destruction harmless. */
object_collection_init(coll);
}
|
