1/* Change priority ceiling setting in pthread_mutexattr_t.
2 Copyright (C) 2006-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <pthreadP.h>
21#include <atomic.h>
22#include <shlib-compat.h>
23
24int
25__pthread_mutexattr_setprioceiling (pthread_mutexattr_t *attr, int prioceiling)
26{
27 /* See __init_sched_fifo_prio. */
28 if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1
29 || atomic_load_relaxed (&__sched_fifo_max_prio) == -1)
30 __init_sched_fifo_prio ();
31
32 if (__glibc_unlikely (prioceiling
33 < atomic_load_relaxed (&__sched_fifo_min_prio))
34 || __glibc_unlikely (prioceiling
35 > atomic_load_relaxed (&__sched_fifo_max_prio))
36 || __glibc_unlikely ((prioceiling
37 & (PTHREAD_MUTEXATTR_PRIO_CEILING_MASK
38 >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT))
39 != prioceiling))
40 return EINVAL;
41
42 struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;
43
44 iattr->mutexkind = ((iattr->mutexkind & ~PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
45 | (prioceiling << PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT));
46
47 return 0;
48}
49versioned_symbol (libc, __pthread_mutexattr_setprioceiling,
50 pthread_mutexattr_setprioceiling, GLIBC_2_34);
51
52#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_4, GLIBC_2_34)
53compat_symbol (libpthread, __pthread_mutexattr_setprioceiling,
54 pthread_mutexattr_setprioceiling, GLIBC_2_4);
55#endif
56