nptl/pthread_mutexattr_setrobust.c

   1 /* Copyright (C) 2005-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <pthreadP.h>
  20 #include <shlib-compat.h>
  21
  22 int
  23 __pthread_mutexattr_setrobust (pthread_mutexattr_t *attr, int robustness)
  24 {
  25   if (robustness != PTHREAD_MUTEX_STALLED_NP
  26       && __builtin_expect (robustness != PTHREAD_MUTEX_ROBUST_NP, 0))
  27     return EINVAL;
  28
  29   struct pthread_mutexattr *iattr = (struct pthread_mutexattr *) attr;
  30
  31   /* We use bit 30 to signal whether the mutex is going to be
  32      robust or not.  */
  33   if (robustness == PTHREAD_MUTEX_STALLED_NP)
  34     iattr->mutexkind &= ~PTHREAD_MUTEXATTR_FLAG_ROBUST;
  35   else
  36     iattr->mutexkind |= PTHREAD_MUTEXATTR_FLAG_ROBUST;
  37
  38   return 0;
  39 }
  40 versioned_symbol (libc, __pthread_mutexattr_setrobust,
  41                   pthread_mutexattr_setrobust, GLIBC_2_34);
  42
  43 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_4, GLIBC_2_34)
  44 compat_symbol (libpthread, __pthread_mutexattr_setrobust,
  45                pthread_mutexattr_setrobust_np, GLIBC_2_4);
  46 #endif
  47
  48 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_12, GLIBC_2_34)
  49 compat_symbol (libpthread, __pthread_mutexattr_setrobust,
  50                pthread_mutexattr_setrobust, GLIBC_2_12);
  51 #endif