1/* Change priority protocol setting in pthread_mutexattr_t.
2 Copyright (C) 2006-2020 Free Software Foundation, Inc.
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
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#include <errno.h>
21#include <pthreadP.h>
22
23
24int
25pthread_mutexattr_setprotocol (pthread_mutexattr_t *attr, int protocol)
26{
27 if (protocol != PTHREAD_PRIO_NONE
28 && protocol != PTHREAD_PRIO_INHERIT
29 && __builtin_expect (protocol != PTHREAD_PRIO_PROTECT, 0))
30 return EINVAL;
31
32 struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;
33
34 iattr->mutexkind = ((iattr->mutexkind & ~PTHREAD_MUTEXATTR_PROTOCOL_MASK)
35 | (protocol << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT));
36
37 return 0;
38}
39