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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/* Test the allocate_once function.
Copyright (C) 2018-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <allocate_once.h>
#include <mcheck.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
/* Allocate a new string. */
static void *
allocate_string (void *closure)
{
return xstrdup (closure);
}
/* Allocation and deallocation functions which are not expected to be
called. */
static void *
allocate_not_called (void *closure)
{
FAIL_EXIT1 ("allocation function called unexpectedly (%p)", closure);
}
static void
deallocate_not_called (void *closure, void *ptr)
{
FAIL_EXIT1 ("deallocate function called unexpectedly (%p, %p)",
closure, ptr);
}
/* Counter for various function calls. */
static int function_called;
/* An allocation function which returns NULL and records that it has
been called. */
static void *
allocate_return_null (void *closure)
{
/* The function should only be called once. */
TEST_COMPARE (function_called, 0);
++function_called;
return NULL;
}
/* The following is used to check the retry logic, by causing a fake
race condition. */
static void *fake_race_place;
static char fake_race_region[3]; /* To obtain unique addresses. */
static void *
fake_race_allocate (void *closure)
{
TEST_VERIFY (closure == &fake_race_region[0]);
TEST_COMPARE (function_called, 0);
++function_called;
/* Fake allocation by another thread. */
fake_race_place = &fake_race_region[1];
return &fake_race_region[2];
}
static void
fake_race_deallocate (void *closure, void *ptr)
{
/* Check that the pointer returned from fake_race_allocate is
deallocated (and not the one stored in fake_race_place). */
TEST_VERIFY (ptr == &fake_race_region[2]);
TEST_VERIFY (fake_race_place == &fake_race_region[1]);
TEST_VERIFY (closure == &fake_race_region[0]);
TEST_COMPARE (function_called, 1);
++function_called;
}
/* Similar to fake_race_allocate, but expects to be paired with free
as the deallocation function. */
static void *
fake_race_allocate_for_free (void *closure)
{
TEST_VERIFY (closure == &fake_race_region[0]);
TEST_COMPARE (function_called, 0);
++function_called;
/* Fake allocation by another thread. */
fake_race_place = &fake_race_region[1];
return xstrdup ("to be freed");
}
static int
do_test (void)
{
mtrace ();
/* Simple allocation. */
void *place1 = NULL;
char *string1 = allocate_once (&place1, allocate_string,
deallocate_not_called,
(char *) "test string 1");
TEST_VERIFY_EXIT (string1 != NULL);
TEST_VERIFY (strcmp ("test string 1", string1) == 0);
/* Second call returns the first pointer, without calling any
callbacks. */
TEST_VERIFY (string1
== allocate_once (&place1, allocate_not_called,
deallocate_not_called,
(char *) "test string 1a"));
/* Different place should result in another call. */
void *place2 = NULL;
char *string2 = allocate_once (&place2, allocate_string,
deallocate_not_called,
(char *) "test string 2");
TEST_VERIFY_EXIT (string2 != NULL);
TEST_VERIFY (strcmp ("test string 2", string2) == 0);
TEST_VERIFY (string1 != string2);
/* Check error reporting (NULL return value from the allocation
function). */
void *place3 = NULL;
char *string3 = allocate_once (&place3, allocate_return_null,
deallocate_not_called, NULL);
TEST_VERIFY (string3 == NULL);
TEST_COMPARE (function_called, 1);
/* Check that the deallocation function is called if the race is
lost. */
function_called = 0;
TEST_VERIFY (allocate_once (&fake_race_place,
fake_race_allocate,
fake_race_deallocate,
&fake_race_region[0])
== &fake_race_region[1]);
TEST_COMPARE (function_called, 2);
function_called = 3;
TEST_VERIFY (allocate_once (&fake_race_place,
fake_race_allocate,
fake_race_deallocate,
&fake_race_region[0])
== &fake_race_region[1]);
TEST_COMPARE (function_called, 3);
/* Similar, but this time rely on that free is called. */
function_called = 0;
fake_race_place = NULL;
TEST_VERIFY (allocate_once (&fake_race_place,
fake_race_allocate_for_free,
NULL,
&fake_race_region[0])
== &fake_race_region[1]);
TEST_COMPARE (function_called, 1);
function_called = 3;
TEST_VERIFY (allocate_once (&fake_race_place,
fake_race_allocate_for_free,
NULL,
&fake_race_region[0])
== &fake_race_region[1]);
TEST_COMPARE (function_called, 3);
free (place2);
free (place1);
return 0;
}
#include <support/test-driver.c>
|
