/*
 * pthread_attr_getstacksize.c
 *
 * Description:
 * This translation unit implements operations on thread attribute objects.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads4w - POSIX Threads for Windows
 *      Copyright 1998 John E. Bossom
 *      Copyright 1999-2018, Pthreads4w contributors
 *
 *      Homepage: https://sourceforge.net/projects/pthreads4w/
 *
 *      The current list of contributors is contained
 *      in the file CONTRIBUTORS included with the source
 *      code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *
 *      https://sourceforge.net/p/pthreads4w/wiki/Contributors/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "pthread.h"
#include "implement.h"

/* ignore warning "unreferenced formal parameter" */
#if defined(_MSC_VER)
#pragma warning( disable : 4100 )
#endif

int
pthread_attr_getstacksize (const pthread_attr_t * attr, size_t * stacksize)
     /*
      * ------------------------------------------------------
      * DOCPUBLIC
      *      This function determines the size of the stack on
      *      which threads created with 'attr' will run.
      *
      * PARAMETERS
      *      attr
      *              pointer to an instance of pthread_attr_t
      *
      *      stacksize
      *              pointer to size_t into which is returned the
      *              stack size, in bytes.
      *
      *
      * DESCRIPTION
      *      This function determines the size of the stack on
      *      which threads created with 'attr' will run.
      *
      *      NOTES:
      *              1)      Function supported only if this macro is
      *                      defined:
      *
      *                              _POSIX_THREAD_ATTR_STACKSIZE
      *
      *              2)      Use on newly created attributes object to
      *                      find the default stack size.
      *
      * RESULTS
      *              0               successfully retrieved stack size,
      *              EINVAL          'attr' is invalid
      *              ENOSYS          function not supported
      *
      * ------------------------------------------------------
      */
{
#if defined(_POSIX_THREAD_ATTR_STACKSIZE) && _POSIX_THREAD_ATTR_STACKSIZE != -1

  if (__ptw32_is_attr (attr) != 0)
    {
      return EINVAL;
    }

  /* Everything is okay. */
  *stacksize = (*attr)->stacksize;
  return 0;

#else

  return ENOSYS;

#endif /* _POSIX_THREAD_ATTR_STACKSIZE */

}