/* Allocate kernel thread.  Hurd/L4 version.
   Copyright (C) 2007, 2008 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <assert.h>
#include <errno.h>
#include <string.h>

#include <hurd/startup.h>
#include <hurd/storage.h>

#include <pt-internal.h>

extern struct hurd_startup_data *__hurd_startup_data;

extern addr_t meta_data_activity;

int
__pthread_thread_alloc (struct __pthread *thread)
{
  /* The main thread is already running of course.  */
  if (__pthread_num_threads == 1)
    {
      thread->object.addr = __hurd_startup_data->thread;
      /* If the main thread exits, then we wait.  Thus, we don't need
	 the shadow cap.  */
      thread->object.cap = NULL;
      thread->threadid = l4_myself ();
      return 0;
    }
  else
    {
      struct storage storage;

      /* We can't don't use mmap as when the exception thread starts
	 running and it accesses its stack, it will fault, which we
	 naturally cannot handle.  */
      storage = storage_alloc (ADDR_VOID, cap_page,
			       STORAGE_UNKNOWN, OBJECT_POLICY_DEFAULT,
			       ADDR_VOID);
      if (ADDR_IS_VOID (storage.addr))
	return EAGAIN;

      thread->exception_page = storage;


      storage = storage_alloc (meta_data_activity, cap_thread,
			       /* Threads are rarely shortly lived.  */
			       STORAGE_MEDIUM_LIVED, OBJECT_POLICY_DEFAULT,
			       ADDR_VOID);
      if (ADDR_IS_VOID (storage.addr))
	{
	  storage_free (thread->exception_page.addr, false);
	  return EAGAIN;
	}

      thread->object = storage;
    }

  return 0;
}