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. 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 pthread_mutex_getprioceiling(mutex,prioceiling)25pthread_mutex_getprioceiling (mutex, prioceiling) 26 const pthread_mutex_t *mutex; 27 int *prioceiling; 28 { 29 if (__builtin_expect ((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 } 38