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glibc  2.9
pthread_mutex_getprioceiling.c
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00001 /* Get current priority ceiling of pthread_mutex_t.
00002    Copyright (C) 2006 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Jakub Jelinek <jakub@redhat.com>, 2006.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <errno.h>
00022 #include <pthreadP.h>
00023 
00024 
00025 int
00026 pthread_mutex_getprioceiling (mutex, prioceiling)
00027      const pthread_mutex_t *mutex;
00028      int *prioceiling;
00029 {
00030   if (__builtin_expect ((mutex->__data.__kind
00031                       & PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0, 0))
00032     return EINVAL;
00033 
00034   *prioceiling = (mutex->__data.__lock & PTHREAD_MUTEX_PRIO_CEILING_MASK)
00035                >> PTHREAD_MUTEX_PRIO_CEILING_SHIFT;
00036 
00037   return 0;
00038 }