/* Test detachability.

   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/>.  */

#define _GNU_SOURCE

#include <pthread.h>

#include <assert.h>

#include <error.h>

#include <errno.h>

#include <unistd.h>

void *

thread (void *arg)

{

  while (1)

    sched_yield ();

}

int

main (int argc, char **argv)

{

  int err;

  pthread_t tid;

  void *ret;

  err = pthread_create (&tid, 0, thread, 0);

  if (err)

    error (1, err, "pthread_create");

  err = pthread_detach (tid);

  if (err)

    error (1, err, "pthread_detach");

  err = pthread_detach (tid);

  assert (err == EINVAL);

  err = pthread_join (tid, &ret;;

  assert (err == EINVAL);

  return 0;

}