/* libc-internal interface for thread-specific data. Stub or TLS version. Copyright (C) 1998,2001,2002,2008,2011 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_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, 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 /* bits/libc-tsd.h */