mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 15:00:06 +00:00
70 lines
2.9 KiB
C
70 lines
2.9 KiB
C
/* libc-internal interface for thread-specific data. Stub or TLS version.
|
|
Copyright (C) 1998,2001,02 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#ifndef _GENERIC_BITS_LIBC_TSD_H
|
|
#define _GENERIC_BITS_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, KEY) -- Define or declare a `void *' datum
|
|
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(KEY) -- Return the `void **' pointing to
|
|
the current thread's datum for KEY.
|
|
__libc_tsd_get(KEY) -- Return the `void *' datum for KEY.
|
|
__libc_tsd_set(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. */
|
|
|
|
#if USE___THREAD
|
|
# define __libc_tsd_define(CLASS, KEY) \
|
|
CLASS __thread void *__libc_tsd_##KEY attribute_tls_model_ie;
|
|
|
|
# define __libc_tsd_address(KEY) (&__libc_tsd_##KEY)
|
|
# define __libc_tsd_get(KEY) (__libc_tsd_##KEY)
|
|
# define __libc_tsd_set(KEY, VALUE) (__libc_tsd_##KEY = (VALUE))
|
|
#else
|
|
# define __libc_tsd_define(CLASS, KEY) CLASS void *__libc_tsd_##KEY##_data;
|
|
|
|
# define __libc_tsd_address(KEY) (&__libc_tsd_##KEY##_data)
|
|
# define __libc_tsd_get(KEY) (__libc_tsd_##KEY##_data)
|
|
# define __libc_tsd_set(KEY, VALUE) (__libc_tsd_##KEY##_data = (VALUE))
|
|
#endif
|
|
|
|
#endif /* bits/libc-tsd.h */
|