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6c6e9a0f3f
This enables us to use more efficient calling conventions and also helps us keep the on-disk structure of a msg object more consistent in future releases.
59 lines
2.7 KiB
C
59 lines
2.7 KiB
C
/* This header supplies atomic operations. So far, we rely on GCC's
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* atomic builtins. During configure, we check if atomic operatons are
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* available. If they are not, I am making the necessary provisioning to live without them if
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* they are not available. Please note that you should only use the macros
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* here if you think you can actually live WITHOUT an explicit atomic operation,
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* because in the non-presence of them, we simply do it without atomicitiy.
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* Which, for word-aligned data types, usually (but only usually!) should work.
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*
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* We are using the functions described in
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* http:/gcc.gnu.org/onlinedocs/gcc/Atomic-Builtins.html
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*
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* THESE MACROS MUST ONLY BE USED WITH WORD-SIZED DATA TYPES!
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*
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* Copyright 2008 Rainer Gerhards and Adiscon GmbH.
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*
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* This file is part of the rsyslog runtime library.
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*
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* The rsyslog runtime library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* The rsyslog runtime 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
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with the rsyslog runtime library. If not, see <http://www.gnu.org/licenses/>.
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*
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* A copy of the GPL can be found in the file "COPYING" in this distribution.
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* A copy of the LGPL can be found in the file "COPYING.LESSER" in this distribution.
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*/
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#include "config.h" /* autotools! */
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#ifndef INCLUDED_ATOMIC_H
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#define INCLUDED_ATOMIC_H
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/* for this release, we disable atomic calls because there seem to be some
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* portability problems and we can not fix that without destabilizing the build.
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* They simply came in too late. -- rgerhards, 2008-04-02
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*/
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#ifdef HAVE_ATOMIC_BUILTINS
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# define ATOMIC_INC(data) ((void) __sync_fetch_and_add(&(data), 1))
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# define ATOMIC_DEC(data) ((void) __sync_sub_and_fetch(&(data), 1))
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# define ATOMIC_DEC_AND_FETCH(data) __sync_sub_and_fetch(&(data), 1)
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# define ATOMIC_FETCH_32BIT(data) ((unsigned) __sync_fetch_and_and(&(data), 0xffffffff))
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# define ATOMIC_STORE_1_TO_32BIT(data) __sync_lock_test_and_set(&(data), 1)
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#else
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# warning "atomic builtins not available, using nul operations"
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# define ATOMIC_INC(data) (++(data))
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# define ATOMIC_DEC(data) (--(data))
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# define ATOMIC_DEC_AND_FETCH(data) (--(data))
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# define ATOMIC_FETCH_32BIT(data) (data)
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# define ATOMIC_STORE_1_TO_32BIT(data) (data) = 1
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#endif
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#endif /* #ifndef INCLUDED_ATOMIC_H */
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