/* Definitions for thread-local data handling.  Hurd version.

   Copyright (C) 2003-2018 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/>.  */

#ifndef _TLS_H

#define _TLS_H

#ifndef __ASSEMBLER__

# include <stddef.h>

# include <stdint.h>

# include <stdbool.h>

# include <sysdep.h>

# include <mach/mig_errors.h>

# include <mach.h>

# include <atomic.h>

/* This is the size of the initial TCB.  */

# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)

/* Alignment requirements for the initial TCB.  */

# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)

/* This is the size of the TCB.  */

# define TLS_TCB_SIZE TLS_INIT_TCB_SIZE	/* XXX */

/* Alignment requirements for the TCB.  */

# define TLS_TCB_ALIGN TLS_INIT_TCB_ALIGN /* XXX */

/* Install the dtv pointer.  The pointer passed is to the element with

   index -1 which contain the length.  */

# define INSTALL_DTV(descr, dtvp) \

  ((tcbhead_t *) (descr))->dtv = (dtvp) + 1

/* Return dtv of given thread descriptor.  */

# define GET_DTV(descr) \

  (((tcbhead_t *) (descr))->dtv)

/* Global scope switch support.  */

#define THREAD_GSCOPE_IN_TCB      0

#define THREAD_GSCOPE_GLOBAL

#define THREAD_GSCOPE_SET_FLAG() \

  atomic_exchange_and_add_acq (&GL(dl_thread_gscope_count), 1)

#define THREAD_GSCOPE_RESET_FLAG() \

  do 									      \

    if (atomic_exchange_and_add_rel (&GL(dl_thread_gscope_count), -1) == 1)   \

      lll_wake (&GL(dl_thread_gscope_count), 0);			      \

  while (0)

#define THREAD_GSCOPE_WAIT() \

  do 									      \

    {									      \

      int count;							      \

      atomic_write_barrier ();						      \

      while ((count = GL(dl_thread_gscope_count)))			      \

        lll_wait (&GL(dl_thread_gscope_count), count, 0);		      \

    }									      \

  while (0)

#endif /* !ASSEMBLER */

#endif /* tls.h */