/* pthread_spin_unlock -- unlock a spin lock.  Generic version.

   Copyright (C) 2003-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include "pthreadP.h"

#include <atomic.h>

int

pthread_spin_unlock (pthread_spinlock_t *lock)

{

  /* The atomic_store_release synchronizes-with the atomic_exchange_acquire

     or atomic_compare_exchange_weak_acquire in pthread_spin_lock /

     pthread_spin_trylock.  */

  atomic_store_release (lock, 0);

  return 0;

}