nptl/pthread_mutex_consistent.c

   1 /* Copyright (C) 2005-2023 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_mutex_consistent (pthread_mutex_t *mutex)
  24 {
  25   /* Test whether this is a robust mutex with a dead owner.
  26      See concurrency notes regarding __kind in struct __pthread_mutex_s
  27      in sysdeps/nptl/bits/thread-shared-types.h.  */
  28   if ((atomic_load_relaxed (&(mutex->__data.__kind))
  29        & PTHREAD_MUTEX_ROBUST_NORMAL_NP) == 0
  30       || mutex->__data.__owner != PTHREAD_MUTEX_INCONSISTENT)
  31     return EINVAL;
  32
  33   mutex->__data.__owner = THREAD_GETMEM (THREAD_SELF, tid);
  34
  35   return 0;
  36 }
  37 versioned_symbol (libc, __pthread_mutex_consistent, pthread_mutex_consistent,
  38                   GLIBC_2_34);
  39
  40 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_4, GLIBC_2_34)
  41 # undef pthread_mutex_consistent_np
  42 compat_symbol (libpthread, __pthread_mutex_consistent,
  43                pthread_mutex_consistent_np, GLIBC_2_4);
  44 #endif
  45
  46 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_12, GLIBC_2_34)
  47 compat_symbol (libpthread, __pthread_mutex_consistent,
  48                pthread_mutex_consistent, GLIBC_2_12);
  49 #endif