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4c96ebdcfe
There was a wrong order of mutex lock operations. It is hard to believe that really caused problems, but in theory it could and with threading we often see that theory becomes practice if something is only used long enough on a fast enough machine with enough CPUs ;)
56 lines
2.5 KiB
C
56 lines
2.5 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_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_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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