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a5f2bd86 | 1 | /* Get priority ceiling setting from pthread_mutexattr_t. |
d614a753 | 2 | Copyright (C) 2006-2020 Free Software Foundation, Inc. |
a5f2bd86 RM |
3 | This file is part of the GNU C Library. |
4 | Contributed by Jakub Jelinek <jakub@redhat.com>, 2006. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
a5f2bd86 RM |
19 | |
20 | #include <pthreadP.h> | |
cdcb42d7 | 21 | #include <atomic.h> |
a5f2bd86 RM |
22 | |
23 | ||
24 | int | |
f63f2bfd JM |
25 | pthread_mutexattr_getprioceiling (const pthread_mutexattr_t *attr, |
26 | int *prioceiling) | |
a5f2bd86 RM |
27 | { |
28 | const struct pthread_mutexattr *iattr; | |
f17efcb4 | 29 | int ceiling; |
a5f2bd86 RM |
30 | |
31 | iattr = (const struct pthread_mutexattr *) attr; | |
32 | ||
f17efcb4 UD |
33 | ceiling = ((iattr->mutexkind & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK) |
34 | >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT); | |
35 | ||
36 | if (! ceiling) | |
37 | { | |
cdcb42d7 TR |
38 | /* See __init_sched_fifo_prio. */ |
39 | if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1) | |
f17efcb4 | 40 | __init_sched_fifo_prio (); |
cdcb42d7 TR |
41 | if (ceiling < atomic_load_relaxed (&__sched_fifo_min_prio)) |
42 | ceiling = atomic_load_relaxed (&__sched_fifo_min_prio); | |
f17efcb4 UD |
43 | } |
44 | ||
45 | *prioceiling = ceiling; | |
a5f2bd86 RM |
46 | |
47 | return 0; | |
48 | } |