nptl/pthread_mutexattr_setprotocol.c

   1 /* Change priority protocol setting in pthread_mutexattr_t.
   2    Copyright (C) 2006-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   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.
   9
  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.
  14
  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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <pthreadP.h>
  21 #include <shlib-compat.h>
  22
  23 int
  24 __pthread_mutexattr_setprotocol (pthread_mutexattr_t *attr, int protocol)
  25 {
  26   if (protocol != PTHREAD_PRIO_NONE
  27       && protocol != PTHREAD_PRIO_INHERIT
  28       && __builtin_expect (protocol != PTHREAD_PRIO_PROTECT, 0))
  29     return EINVAL;
  30
  31   struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;
  32
  33   iattr->mutexkind = ((iattr->mutexkind & ~PTHREAD_MUTEXATTR_PROTOCOL_MASK)
  34                       | (protocol << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT));
  35
  36   return 0;
  37 }
  38 versioned_symbol (libc, __pthread_mutexattr_setprotocol,
  39                   pthread_mutexattr_setprotocol, GLIBC_2_34);
  40
  41 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_4, GLIBC_2_34)
  42 compat_symbol (libpthread, __pthread_mutexattr_setprotocol,
  43                pthread_mutexattr_setprotocol, GLIBC_2_4);
  44 #endif