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