x86: Support IBT and SHSTK in Intel CET [BZ #21598]
[glibc.git] / nptl / pthread_mutexattr_setrobust.c
blobf8aecf8507dea6b26aea4b5e1074d603cc70ff14
1 /* Copyright (C) 2005-2018 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2005.
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.
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.
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 <http://www.gnu.org/licenses/>. */
19 #include <errno.h>
20 #include <pthreadP.h>
23 int
24 pthread_mutexattr_setrobust (pthread_mutexattr_t *attr, int robustness)
26 if (robustness != PTHREAD_MUTEX_STALLED_NP
27 && __builtin_expect (robustness != PTHREAD_MUTEX_ROBUST_NP, 0))
28 return EINVAL;
30 struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;
32 /* We use bit 30 to signal whether the mutex is going to be
33 robust or not. */
34 if (robustness == PTHREAD_MUTEX_STALLED_NP)
35 iattr->mutexkind &= ~PTHREAD_MUTEXATTR_FLAG_ROBUST;
36 else
37 iattr->mutexkind |= PTHREAD_MUTEXATTR_FLAG_ROBUST;
39 return 0;
41 weak_alias (pthread_mutexattr_setrobust, pthread_mutexattr_setrobust_np)