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glibc  2.9
pthread_mutexattr_getprioceiling.c
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00001 /* Get priority ceiling setting from pthread_mutexattr_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 <pthreadP.h>
00022 
00023 
00024 int
00025 pthread_mutexattr_getprioceiling (attr, prioceiling)
00026      const pthread_mutexattr_t *attr;
00027      int *prioceiling;
00028 {
00029   const struct pthread_mutexattr *iattr;
00030   int ceiling;
00031 
00032   iattr = (const struct pthread_mutexattr *) attr;
00033 
00034   ceiling = ((iattr->mutexkind & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
00035             >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT);
00036 
00037   if (! ceiling)
00038     {
00039       if (__sched_fifo_min_prio == -1)
00040        __init_sched_fifo_prio ();
00041       if (ceiling < __sched_fifo_min_prio)
00042        ceiling = __sched_fifo_min_prio;
00043     }
00044 
00045   *prioceiling = ceiling;
00046 
00047   return 0;
00048 }