1  /* Destroy a semaphore.  Generic version.
       2     Copyright (C) 2005-2023 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 <semaphore.h>
      20  #include <errno.h>
      21  
      22  #include <hurd.h>
      23  #include <pt-internal.h>
      24  
      25  int
      26  __sem_destroy (sem_t *sem)
      27  {
      28    struct new_sem *isem = (struct new_sem *) sem;
      29    if (
      30  #if __HAVE_64B_ATOMICS
      31        atomic_load_relaxed (&isem->data) >> SEM_NWAITERS_SHIFT
      32  #else
      33        atomic_load_relaxed (&isem->value) & SEM_NWAITERS_MASK
      34        || isem->nwaiters
      35  #endif
      36        )
      37      /* There are threads waiting on *SEM.  */
      38      return __hurd_fail (EBUSY);
      39  
      40    return 0;
      41  }
      42  
      43  strong_alias (__sem_destroy, sem_destroy);