nptl/pthread_mutexattr_getprotocol.c

   1 /* Get priority protocol setting from 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 <pthreadP.h>
  21
  22
  23 int
  24 pthread_mutexattr_getprotocol (const pthread_mutexattr_t *attr, int *protocol)
  25 {
  26   const struct pthread_mutexattr *iattr;
  27
  28   iattr = (const struct pthread_mutexattr *) attr;
  29
  30   *protocol = ((iattr->mutexkind & PTHREAD_MUTEXATTR_PROTOCOL_MASK)
  31                >> PTHREAD_MUTEXATTR_PROTOCOL_SHIFT);
  32
  33   return 0;
  34 }