/* Get current priority ceiling of pthread_mutex_t. Copyright (C) 2006-2016 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Jakub Jelinek <jakub@redhat.com>, 2006. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include <pthreadP.h> int pthread_mutex_getprioceiling (const pthread_mutex_t *mutex, int *prioceiling) { if (__builtin_expect ((mutex->__data.__kind & PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0, 0)) return EINVAL; *prioceiling = (mutex->__data.__lock & PTHREAD_MUTEX_PRIO_CEILING_MASK) >> PTHREAD_MUTEX_PRIO_CEILING_SHIFT; return 0; }