1 | /* Test that glibc.malloc.mxfast tunable works. |
2 | Copyright (C) 2019-2024 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 | /* This test verifies that setting the glibc.malloc.mxfast tunable to |
20 | zero results in free'd blocks being returned to the small bins, not |
21 | the fast bins. */ |
22 | |
23 | #include <malloc.h> |
24 | #include <libc-diag.h> |
25 | #include <support/check.h> |
26 | |
27 | int |
28 | do_test (void) |
29 | { |
30 | struct mallinfo m; |
31 | char *volatile p1; |
32 | char *volatile p2; |
33 | |
34 | /* Arbitrary value; must be in default fastbin range. */ |
35 | p1 = malloc (size: 3); |
36 | /* Something large so that p1 isn't a "top block" */ |
37 | p2 = malloc (size: 512); |
38 | free (ptr: p1); |
39 | |
40 | /* The test below covers the deprecated mallinfo function. */ |
41 | DIAG_PUSH_NEEDS_COMMENT; |
42 | DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdeprecated-declarations" ); |
43 | |
44 | m = mallinfo (); |
45 | |
46 | DIAG_POP_NEEDS_COMMENT; |
47 | |
48 | /* This will fail if there are any blocks in the fastbins. */ |
49 | TEST_COMPARE (m.smblks, 0); |
50 | |
51 | /* To keep gcc happy. */ |
52 | free (ptr: p2); |
53 | |
54 | return 0; |
55 | } |
56 | |
57 | #include <support/test-driver.c> |
58 | |