summary refs log tree commit diff
path: root/nptl/pthread_mutexattr_setprotocol.c
blob: 96ee9be3161c1e8e886fb240b235fa9e2f80f123 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
/* Change priority protocol setting in pthread_mutexattr_t.
   Copyright (C) 2006-2019 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 <errno.h>
#include <pthreadP.h>


int
pthread_mutexattr_setprotocol (pthread_mutexattr_t *attr, int protocol)
{
  if (protocol != PTHREAD_PRIO_NONE
      && protocol != PTHREAD_PRIO_INHERIT
      && __builtin_expect (protocol != PTHREAD_PRIO_PROTECT, 0))
    return EINVAL;

  struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;

  iattr->mutexkind = ((iattr->mutexkind & ~PTHREAD_MUTEXATTR_PROTOCOL_MASK)
		      | (protocol << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT));

  return 0;
}