Back to index

glibc  2.9
pthread_mutexattr_setprioceiling.c
Go to the documentation of this file.
00001 /* Change priority ceiling setting in 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 <errno.h>
00022 #include <pthreadP.h>
00023 
00024 
00025 int
00026 pthread_mutexattr_setprioceiling (attr, prioceiling)
00027      pthread_mutexattr_t *attr;
00028      int prioceiling;
00029 {
00030   if (__sched_fifo_min_prio == -1)
00031     __init_sched_fifo_prio ();
00032 
00033   if (__builtin_expect (prioceiling < __sched_fifo_min_prio, 0)
00034       || __builtin_expect (prioceiling > __sched_fifo_max_prio, 0)
00035       || __builtin_expect ((prioceiling
00036                          & (PTHREAD_MUTEXATTR_PRIO_CEILING_MASK
00037                             >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT))
00038                         != prioceiling, 0))
00039     return EINVAL;
00040 
00041   struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;
00042 
00043   iattr->mutexkind = ((iattr->mutexkind & ~PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
00044                     | (prioceiling << PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT));
00045 
00046   return 0;
00047 }