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a5f2bd86 | 1 | /* Change priority ceiling setting in 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 <errno.h> | |
21 | #include <pthreadP.h> | |
cdcb42d7 | 22 | #include <atomic.h> |
a5f2bd86 RM |
23 | |
24 | ||
25 | int | |
9d46370c | 26 | pthread_mutexattr_setprioceiling (pthread_mutexattr_t *attr, int prioceiling) |
a5f2bd86 | 27 | { |
cdcb42d7 TR |
28 | /* See __init_sched_fifo_prio. */ |
29 | if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1 | |
30 | || atomic_load_relaxed (&__sched_fifo_max_prio) == -1) | |
f17efcb4 UD |
31 | __init_sched_fifo_prio (); |
32 | ||
cdcb42d7 TR |
33 | if (__glibc_unlikely (prioceiling |
34 | < atomic_load_relaxed (&__sched_fifo_min_prio)) | |
35 | || __glibc_unlikely (prioceiling | |
36 | > atomic_load_relaxed (&__sched_fifo_max_prio)) | |
37 | || __glibc_unlikely ((prioceiling | |
f17efcb4 UD |
38 | & (PTHREAD_MUTEXATTR_PRIO_CEILING_MASK |
39 | >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT)) | |
cdcb42d7 | 40 | != prioceiling)) |
a5f2bd86 RM |
41 | return EINVAL; |
42 | ||
43 | struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr; | |
44 | ||
45 | iattr->mutexkind = ((iattr->mutexkind & ~PTHREAD_MUTEXATTR_PRIO_CEILING_MASK) | |
46 | | (prioceiling << PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT)); | |
47 | ||
48 | return 0; | |
49 | } |