/* Signal a condition.  Generic version.

   Copyright (C) 2000-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   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 <pthread.h>

#include <pt-internal.h>

/* Unblock at least one of the threads that are blocked on condition

   variable COND.  */

int

__pthread_cond_signal (pthread_cond_t *cond)

{

  struct __pthread *wakeup;

  __pthread_spin_lock (&cond->__lock);

  wakeup = cond->__queue;

  if (wakeup != NULL)

    __pthread_dequeue (wakeup);

  __pthread_spin_unlock (&cond->__lock);

  if (wakeup != NULL)

    __pthread_wakeup (wakeup);

  return 0;

}

strong_alias (__pthread_cond_signal, pthread_cond_signal);