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[glibc/history.git] / nptl / pthread_mutex_getprioceiling.c
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1 /* Get current priority ceiling of pthread_mutex_t.
2 Copyright (C) 2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Jakub Jelinek <jakub@redhat.com>, 2006.
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.
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.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
21 #include <errno.h>
22 #include <pthreadP.h>
25 int
26 pthread_mutex_getprioceiling (mutex, prioceiling)
27 const pthread_mutex_t *mutex;
28 int *prioceiling;
30 if (__builtin_expect ((mutex->__data.__kind
31 & PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0, 0))
32 return EINVAL;
34 *prioceiling = (mutex->__data.__lock & PTHREAD_MUTEX_PRIO_CEILING_MASK)
35 >> PTHREAD_MUTEX_PRIO_CEILING_SHIFT;
37 return 0;