sysdeps/htl/sem-getvalue.c

   1 /* Get the value of a semaphore.  Generic version.
   2    Copyright (C) 2005-2018 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    <http://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   __pthread_spin_lock (&sem->__lock);
  26   *value = sem->__value;
  27   __pthread_spin_unlock (&sem->__lock);
  28
  29   return 0;
  30 }
  31
  32 strong_alias (__sem_getvalue, sem_getvalue);