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18d59c1b | 1 | /* C11 threads mutex initialization implementation. |
04277e02 | 2 | Copyright (C) 2018-2019 Free Software Foundation, Inc. |
18d59c1b AZ |
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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <stdalign.h> | |
20 | ||
21 | #include "thrd_priv.h" | |
22 | ||
23 | int | |
24 | mtx_init (mtx_t *mutex, int type) | |
25 | { | |
26 | _Static_assert (sizeof (mtx_t) == sizeof (pthread_mutex_t), | |
27 | "sizeof (mtx_t) != sizeof (pthread_mutex_t)"); | |
28 | _Static_assert (alignof (mtx_t) == alignof (pthread_mutex_t), | |
29 | "alignof (mtx_t) != alignof (pthread_mutex_t)"); | |
30 | ||
31 | pthread_mutexattr_t attr; | |
32 | ||
33 | __pthread_mutexattr_init (&attr); | |
34 | ||
35 | /* Another possible solution would be to set the flags directly in | |
36 | mutex object. */ | |
37 | switch (type) | |
38 | { | |
39 | case mtx_plain | mtx_recursive: | |
40 | case mtx_timed | mtx_recursive: | |
41 | __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE); | |
42 | break; | |
43 | case mtx_plain: | |
44 | case mtx_timed: /* No difference between both in standard */ | |
45 | default: | |
46 | __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_NORMAL); | |
47 | break; | |
48 | } | |
49 | ||
50 | int err_code = __pthread_mutex_init ((pthread_mutex_t *) mutex, &attr); | |
51 | /* pthread_mutexattr_destroy implementation is a noop. */ | |
52 | return thrd_err_map (err_code); | |
53 | } |