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6310e6be | 1 | /* Pthread mutex tunable parameters. |
04277e02 | 2 | Copyright (C) 2018-2019 Free Software Foundation, Inc. |
6310e6be KW |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
6310e6be KW |
18 | |
19 | #if HAVE_TUNABLES | |
20 | # define TUNABLE_NAMESPACE pthread | |
21 | #include <pthread_mutex_conf.h> | |
22 | #include <stdint.h> | |
23 | #include <stdbool.h> | |
24 | #include <unistd.h> /* Get STDOUT_FILENO for _dl_printf. */ | |
25 | #include <elf/dl-tunables.h> | |
26 | ||
27 | struct mutex_config __mutex_aconf = | |
28 | { | |
29 | /* The maximum number of times a thread should spin on the lock before | |
30 | calling into kernel to block. */ | |
31 | .spin_count = DEFAULT_ADAPTIVE_COUNT, | |
32 | }; | |
33 | ||
34 | static void | |
35 | TUNABLE_CALLBACK (set_mutex_spin_count) (tunable_val_t *valp) | |
36 | { | |
37 | __mutex_aconf.spin_count = (int32_t) (valp)->numval; | |
38 | } | |
39 | ||
40 | void | |
41 | __pthread_tunables_init (void) | |
42 | { | |
43 | TUNABLE_GET (mutex_spin_count, int32_t, | |
44 | TUNABLE_CALLBACK (set_mutex_spin_count)); | |
45 | } | |
46 | #endif |