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61 lines
2.5 KiB
C
61 lines
2.5 KiB
C
/* libc-internal interface for thread-specific data. Stub or TLS version.
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Copyright (C) 1998-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _GENERIC_LIBC_TSD_H
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#define _GENERIC_LIBC_TSD_H 1
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/* This file defines the following macros for accessing a small fixed
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set of thread-specific `void *' data used only internally by libc.
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__libc_tsd_define(CLASS, TYPE, KEY) -- Define or declare a datum with TYPE
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for KEY. CLASS can be `static' for
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keys used in only one source file,
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empty for global definitions, or
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`extern' for global declarations.
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__libc_tsd_address(TYPE, KEY) -- Return the `TYPE *' pointing to
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the current thread's datum for KEY.
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__libc_tsd_get(TYPE, KEY) -- Return the `TYPE' datum for KEY.
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__libc_tsd_set(TYPE, KEY, VALUE) -- Set the datum for KEY to VALUE.
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The set of available KEY's will usually be provided as an enum,
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and contains (at least):
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_LIBC_TSD_KEY_MALLOC
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_LIBC_TSD_KEY_DL_ERROR
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_LIBC_TSD_KEY_RPC_VARS
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All uses must be the literal _LIBC_TSD_* name in the __libc_tsd_* macros.
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Some implementations may not provide any enum at all and instead
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using string pasting in the macros. */
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#include <tls.h>
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/* When full support for __thread variables is available, this interface is
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just a trivial wrapper for it. Without TLS, this is the generic/stub
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implementation for wholly single-threaded systems.
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We don't define an enum for the possible key values, because the KEYs
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translate directly into variables by macro magic. */
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#define __libc_tsd_define(CLASS, TYPE, KEY) \
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CLASS __thread TYPE __libc_tsd_##KEY attribute_tls_model_ie;
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#define __libc_tsd_address(TYPE, KEY) (&__libc_tsd_##KEY)
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#define __libc_tsd_get(TYPE, KEY) (__libc_tsd_##KEY)
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#define __libc_tsd_set(TYPE, KEY, VALUE) (__libc_tsd_##KEY = (VALUE))
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#endif /* libc-tsd.h */
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