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1 | /* Get current priority ceiling of pthread_mutex_t. | |
2 | Copyright (C) 2006-2019 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | Contributed by Jakub Jelinek <jakub@redhat.com>, 2006. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <pthreadP.h> | |
22 | ||
23 | ||
24 | int | |
25 | pthread_mutex_getprioceiling (const pthread_mutex_t *mutex, int *prioceiling) | |
26 | { | |
27 | /* See concurrency notes regarding __kind in struct __pthread_mutex_s | |
28 | in sysdeps/nptl/bits/thread-shared-types.h. */ | |
29 | if (__builtin_expect ((atomic_load_relaxed (&(mutex->__data.__kind)) | |
30 | & PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0, 0)) | |
31 | return EINVAL; | |
32 | ||
33 | *prioceiling = (mutex->__data.__lock & PTHREAD_MUTEX_PRIO_CEILING_MASK) | |
34 | >> PTHREAD_MUTEX_PRIO_CEILING_SHIFT; | |
35 | ||
36 | return 0; | |
37 | } |