1 /* Smoke test for malloc_info.
2 Copyright (C) 2017-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 /* The purpose of this test is to provide a quick way to run
20 malloc_info in a multi-threaded process. */
21
22 #include <array_length.h>
23 #include <malloc.h>
24 #include <stdlib.h>
25 #include <support/support.h>
26 #include <support/xthread.h>
27
28 /* This barrier is used to have the main thread wait until the helper
29 threads have performed their allocations. */
30 static pthread_barrier_t barrier;
31
32 enum
33 {
34 /* Number of threads performing allocations. */
35 thread_count = 4,
36
37 /* Amount of memory allocation per thread. This should be large
38 enough to cause the allocation of multiple heaps per arena. */
39 per_thread_allocations
40 = sizeof (void *) == 4 ? 16 * 1024 * 1024 : 128 * 1024 * 1024,
41 };
42
43 static void *
allocation_thread_function(void * closure)44 allocation_thread_function (void *closure)
45 {
46 struct list
47 {
48 struct list *next;
49 long dummy[4];
50 };
51
52 struct list *head = NULL;
53 size_t allocated = 0;
54 while (allocated < per_thread_allocations)
55 {
56 struct list *new_head = xmalloc (sizeof (*new_head));
57 allocated += sizeof (*new_head);
58 new_head->next = head;
59 head = new_head;
60 }
61
62 xpthread_barrier_wait (&barrier);
63
64 /* Main thread prints first statistics here. */
65
66 xpthread_barrier_wait (&barrier);
67
68 while (head != NULL)
69 {
70 struct list *next_head = head->next;
71 free (head);
72 head = next_head;
73 }
74
75 return NULL;
76 }
77
78 static int
do_test(void)79 do_test (void)
80 {
81 xpthread_barrier_init (&barrier, NULL, thread_count + 1);
82
83 pthread_t threads[thread_count];
84 for (size_t i = 0; i < array_length (threads); ++i)
85 threads[i] = xpthread_create (NULL, allocation_thread_function, NULL);
86
87 xpthread_barrier_wait (&barrier);
88 puts ("info: After allocation:");
89 malloc_info (0, stdout);
90
91 xpthread_barrier_wait (&barrier);
92 for (size_t i = 0; i < array_length (threads); ++i)
93 xpthread_join (threads[i]);
94
95 puts ("\ninfo: After deallocation:");
96 malloc_info (0, stdout);
97
98 return 0;
99 }
100
101 #include <support/test-driver.c>
102