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glibc/bits/libc-tsd.h
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/* 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_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_TLS && HAVE___THREAD | |
# define __libc_tsd_define(CLASS, KEY) CLASS __thread void *__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_get(KEY) (__libc_tsd_##KEY##_data) | |
# define __libc_tsd_set(KEY, VALUE) (__libc_tsd_##KEY##_data = (VALUE)) | |
#endif | |
#endif /* bits/libc-tsd.h */ |