/* Copyright (C) 2002-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.

   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 <errno.h>

#include <stdlib.h>

#include "pthreadP.h"

#include <atomic.h>

#include <shlib-compat.h>

#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_3_2)

int

__pthread_cond_signal_2_0 (pthread_cond_2_0_t *cond)

{

  if (cond->cond == NULL)

    {

      pthread_cond_t *newcond;

#if LLL_LOCK_INITIALIZER == 0

      newcond = (pthread_cond_t *) calloc (sizeof (pthread_cond_t), 1);

      if (newcond == NULL)

	return ENOMEM;

#else

      newcond = (pthread_cond_t *) malloc (sizeof (pthread_cond_t));

      if (newcond == NULL)

	return ENOMEM;

      /* Initialize the condvar.  */

      (void) pthread_cond_init (newcond, NULL);

#endif

      if (atomic_compare_and_exchange_bool_acq (&cond->cond, newcond, NULL))

	/* Somebody else just initialized the condvar.  */

	free (newcond);

    }

  return __pthread_cond_signal (cond->cond);

}

compat_symbol (libpthread, __pthread_cond_signal_2_0, pthread_cond_signal,

	       GLIBC_2_0);

#endif