blob: d8385d74d6e3c5fe8c0968a86aafe861ad69c208 (
plain)
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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/* wmem_scopes.c
* Wireshark Memory Manager Scopes
* Copyright 2012, Evan Huus <eapache@gmail.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <glib.h>
#include "wmem_scopes.h"
#include <wsutil/ws_assert.h>
/* One of the supposed benefits of wmem over the old emem was going to be that
* the scoping of the various memory pools would be obvious, since they would
* no longer be global. Instead, the pools would be managed as variables scoped
* by the compiler, so functions outside of that scope wouldn't have access to
* the pools and wouldn't be able to allocate memory in a scope to which they
* didn't belong.
*
* That idea fell apart rather quickly :P
*
* The principle still stands, and most pools should be managed in that way.
* The three in this file are *exceptions*. They are the three scopes that emem
* provided as globals. Converting all of the code that used them to pass an
* extra parameter (or three) around would have been a nightmare of epic
* proportions, so we provide these three as globals still.
*
* We do, however, use some extra booleans and a mountain of assertions to try
* and catch anybody accessing the pools out of the correct scope. It's not
* perfect, but it should stop most of the bad behaviour that emem permitted.
*/
/* TODO: Make these thread-local */
static wmem_allocator_t *packet_scope = NULL;
static wmem_allocator_t *file_scope = NULL;
static wmem_allocator_t *epan_scope = NULL;
/* Packet Scope */
wmem_allocator_t *
wmem_packet_scope(void)
{
ws_assert(packet_scope);
return packet_scope;
}
void
wmem_enter_packet_scope(void)
{
ws_assert(packet_scope);
ws_assert(wmem_in_scope(file_scope));
ws_assert(!wmem_in_scope(packet_scope));
wmem_enter_scope(packet_scope);
}
void
wmem_leave_packet_scope(void)
{
ws_assert(packet_scope);
ws_assert(wmem_in_scope(packet_scope));
wmem_leave_scope(packet_scope);
}
/* File Scope */
wmem_allocator_t *
wmem_file_scope(void)
{
ws_assert(file_scope);
return file_scope;
}
void
wmem_enter_file_scope(void)
{
ws_assert(file_scope);
ws_assert(!wmem_in_scope(file_scope));
wmem_enter_scope(file_scope);
}
void
wmem_leave_file_scope(void)
{
ws_assert(file_scope);
ws_assert(wmem_in_scope(file_scope));
ws_assert(!wmem_in_scope(packet_scope));
wmem_leave_scope(file_scope);
/* this seems like a good time to do garbage collection */
wmem_gc(file_scope);
wmem_gc(packet_scope);
}
/* Epan Scope */
wmem_allocator_t *
wmem_epan_scope(void)
{
ws_assert(epan_scope);
return epan_scope;
}
/* Scope Management */
void
wmem_init_scopes(void)
{
ws_assert(packet_scope == NULL);
ws_assert(file_scope == NULL);
ws_assert(epan_scope == NULL);
wmem_init();
packet_scope = wmem_allocator_new(WMEM_ALLOCATOR_BLOCK_FAST);
file_scope = wmem_allocator_new(WMEM_ALLOCATOR_BLOCK);
epan_scope = wmem_allocator_new(WMEM_ALLOCATOR_BLOCK);
/* Scopes are initialized to TRUE by default on creation */
wmem_leave_scope(packet_scope);
wmem_leave_scope(file_scope);
}
void
wmem_cleanup_scopes(void)
{
ws_assert(packet_scope);
ws_assert(file_scope);
ws_assert(epan_scope);
ws_assert(!wmem_in_scope(packet_scope));
ws_assert(!wmem_in_scope(file_scope));
wmem_destroy_allocator(packet_scope);
wmem_destroy_allocator(file_scope);
wmem_destroy_allocator(epan_scope);
wmem_cleanup();
packet_scope = NULL;
file_scope = NULL;
epan_scope = NULL;
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
|
