aboutsummaryrefslogtreecommitdiff
path: root/nptl/pthread_mutexattr_getprioceiling.c
blob: 6831fe3d2880414a35bb4e1f82bb7f8c46d273f1 (plain)
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
39
40
41
42
43
44
45
46
47
/* Get priority ceiling setting from pthread_mutexattr_t.
   Copyright (C) 2006-2013 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 <pthreadP.h>


int
pthread_mutexattr_getprioceiling (attr, prioceiling)
     const pthread_mutexattr_t *attr;
     int *prioceiling;
{
  const struct pthread_mutexattr *iattr;
  int ceiling;

  iattr = (const struct pthread_mutexattr *) attr;

  ceiling = ((iattr->mutexkind & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
	     >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT);

  if (! ceiling)
    {
      if (__sched_fifo_min_prio == -1)
	__init_sched_fifo_prio ();
      if (ceiling < __sched_fifo_min_prio)
	ceiling = __sched_fifo_min_prio;
    }

  *prioceiling = ceiling;

  return 0;
}