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Diffstat (limited to 'sysdeps/generic/bits/libc-tsd.h')
| -rw-r--r-- | sysdeps/generic/bits/libc-tsd.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/sysdeps/generic/bits/libc-tsd.h b/sysdeps/generic/bits/libc-tsd.h new file mode 100644 index 0000000000..d39382952a --- /dev/null +++ b/sysdeps/generic/bits/libc-tsd.h @@ -0,0 +1,69 @@ +/* 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 */ |