| /* Change priority ceiling setting in pthread_mutexattr_t. |
| Copyright (C) 2006-2018 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> |
| #include <atomic.h> |
| |
| |
| int |
| pthread_mutexattr_setprioceiling (pthread_mutexattr_t *attr, int prioceiling) |
| { |
| /* See __init_sched_fifo_prio. */ |
| if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1 |
| || atomic_load_relaxed (&__sched_fifo_max_prio) == -1) |
| __init_sched_fifo_prio (); |
| |
| if (__glibc_unlikely (prioceiling |
| < atomic_load_relaxed (&__sched_fifo_min_prio)) |
| || __glibc_unlikely (prioceiling |
| > atomic_load_relaxed (&__sched_fifo_max_prio)) |
| || __glibc_unlikely ((prioceiling |
| & (PTHREAD_MUTEXATTR_PRIO_CEILING_MASK |
| >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT)) |
| != prioceiling)) |
| return EINVAL; |
| |
| struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr; |
| |
| iattr->mutexkind = ((iattr->mutexkind & ~PTHREAD_MUTEXATTR_PRIO_CEILING_MASK) |
| | (prioceiling << PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT)); |
| |
| return 0; |
| } |
