1 /* Change priority ceiling setting in pthread_mutexattr_t.
2 Copyright (C) 2006 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 <http://www.gnu.org/licenses/>. */
19
20 #include <errno.h>
21 #include <pthreadP.h>
22
23
24 int
pthread_mutexattr_setprioceiling(pthread_mutexattr_t * attr,int prioceiling)25 pthread_mutexattr_setprioceiling (
26 pthread_mutexattr_t *attr,
27 int prioceiling)
28 {
29 if (__sched_fifo_min_prio == -1)
30 __init_sched_fifo_prio ();
31
32 if (__builtin_expect (prioceiling < __sched_fifo_min_prio, 0)
33 || __builtin_expect (prioceiling > __sched_fifo_max_prio, 0)
34 || __builtin_expect ((prioceiling
35 & (PTHREAD_MUTEXATTR_PRIO_CEILING_MASK
36 >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT))
37 != prioceiling, 0))
38 return EINVAL;
39
40 struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;
41
42 iattr->mutexkind = ((iattr->mutexkind & ~PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
43 | (prioceiling << PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT));
44
45 return 0;
46 }
47