1  /* Get the value of 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 <pt-internal.h>
      21  
      22  int
      23  __sem_getvalue (sem_t *restrict sem, int *restrict value)
      24  {
      25    struct new_sem *isem = (struct new_sem *) sem;
      26  
      27  #if __HAVE_64B_ATOMICS
      28    *value = atomic_load_relaxed (&isem->data) & SEM_VALUE_MASK;
      29  #else
      30    *value = atomic_load_relaxed (&isem->value) >> SEM_VALUE_SHIFT;
      31  #endif
      32  
      33    return 0;
      34  }
      35  
      36  strong_alias (__sem_getvalue, sem_getvalue);