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/* Get priority ceiling setting from pthread_mutexattr_t.
Copyright (C) 2006-2020 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
<https://www.gnu.org/licenses/>. */
#include <pthreadP.h>
#include <atomic.h>
int
pthread_mutexattr_getprioceiling (const pthread_mutexattr_t *attr,
int *prioceiling)
{
const struct pthread_mutexattr *iattr;
int ceiling;
iattr = (const struct pthread_mutexattr *) attr;
ceiling = ((iattr->mutexkind & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
>> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT);
if (! ceiling)
{
/* See __init_sched_fifo_prio. */
if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1)
__init_sched_fifo_prio ();
if (ceiling < atomic_load_relaxed (&__sched_fifo_min_prio))
ceiling = atomic_load_relaxed (&__sched_fifo_min_prio);
}
*prioceiling = ceiling;
return 0;
}
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