1/* Get current priority ceiling of pthread_mutex_t.
2 Copyright (C) 2006-2018 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
24int
25pthread_mutex_getprioceiling (const pthread_mutex_t *mutex, int *prioceiling)
26{
27 if (__builtin_expect ((mutex->__data.__kind
28 & PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0, 0))
29 return EINVAL;
30
31 *prioceiling = (mutex->__data.__lock & PTHREAD_MUTEX_PRIO_CEILING_MASK)
32 >> PTHREAD_MUTEX_PRIO_CEILING_SHIFT;
33
34 return 0;
35}
36