mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 11:20:07 +00:00
49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* Get priority ceiling setting from pthread_mutexattr_t.
|
|
Copyright (C) 2006-2017 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 <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;
|
|
}
|