/* libc-internal interface for thread-specific data.  Stub or TLS version.

   Copyright (C) 1998-2018 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 _GENERIC_LIBC_TSD_H

#define _GENERIC_LIBC_TSD_H 1

/* This file defines the following macros for accessing a small fixed

   set of thread-specific `void *' data used only internally by libc.

   __libc_tsd_define(CLASS, TYPE, KEY)	-- Define or declare a datum with TYPE

					   for KEY.  CLASS can be `static' for

					   keys used in only one source file,

					   empty for global definitions, or

					   `extern' for global declarations.

   __libc_tsd_address(TYPE, KEY)	-- Return the `TYPE *' pointing to

					   the current thread's datum for KEY.

   __libc_tsd_get(TYPE, KEY)		-- Return the `TYPE' datum for KEY.

   __libc_tsd_set(TYPE, KEY, VALUE)	-- Set the datum for KEY to VALUE.

   The set of available KEY's will usually be provided as an enum,

   and contains (at least):

		_LIBC_TSD_KEY_MALLOC

		_LIBC_TSD_KEY_DL_ERROR

		_LIBC_TSD_KEY_RPC_VARS

   All uses must be the literal _LIBC_TSD_* name in the __libc_tsd_* macros.

   Some implementations may not provide any enum at all and instead

   using string pasting in the macros.  */

#include <tls.h>

/* When full support for __thread variables is available, this interface is

   just a trivial wrapper for it.  Without TLS, this is the generic/stub

   implementation for wholly single-threaded systems.

   We don't define an enum for the possible key values, because the KEYs

   translate directly into variables by macro magic.  */

#define __libc_tsd_define(CLASS, TYPE, KEY)	\

  CLASS __thread TYPE __libc_tsd_##KEY attribute_tls_model_ie;

#define __libc_tsd_address(TYPE, KEY)		(&__libc_tsd_##KEY)

#define __libc_tsd_get(TYPE, KEY)		(__libc_tsd_##KEY)

#define __libc_tsd_set(TYPE, KEY, VALUE)	(__libc_tsd_##KEY = (VALUE))

#endif	/* libc-tsd.h */