70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
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#ifndef ATOMIC_NOLOCK_INCLUDED
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#define ATOMIC_NOLOCK_INCLUDED
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/* Copyright (C) 2006 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program 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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#if defined(__i386__) || defined(_MSC_VER) || defined(__x86_64__) \
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|| defined(HAVE_GCC_ATOMIC_BUILTINS) \
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|| defined(HAVE_SOLARIS_ATOMIC)
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# ifdef MY_ATOMIC_MODE_DUMMY
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# define LOCK_prefix ""
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# else
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# define LOCK_prefix "lock"
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# endif
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/*
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We choose implementation as follows:
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------------------------------------
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On Windows using Visual C++ the native implementation should be
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preferrable. When using gcc we prefer the Solaris implementation
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before the gcc because of stability preference, we choose gcc
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builtins if available, otherwise we choose the somewhat broken
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native x86 implementation. If neither Visual C++ or gcc we still
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choose the Solaris implementation on Solaris (mainly for SunStudio
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compilers).
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*/
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# if defined(_MSV_VER)
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# include "generic-msvc.h"
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# elif __GNUC__
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# if defined(HAVE_SOLARIS_ATOMIC)
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# include "solaris.h"
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# elif defined(HAVE_GCC_ATOMIC_BUILTINS)
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# include "gcc_builtins.h"
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# elif defined(__i386__) || defined(__x86_64__)
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# include "x86-gcc.h"
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# endif
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# elif defined(HAVE_SOLARIS_ATOMIC)
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# include "solaris.h"
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# endif
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#endif
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#if defined(make_atomic_cas_body)
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/*
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Type not used so minimal size (emptry struct has different size between C
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and C++, zero-length array is gcc-specific).
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*/
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typedef char my_atomic_rwlock_t __attribute__ ((unused));
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#define my_atomic_rwlock_destroy(name)
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#define my_atomic_rwlock_init(name)
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#define my_atomic_rwlock_rdlock(name)
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#define my_atomic_rwlock_wrlock(name)
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#define my_atomic_rwlock_rdunlock(name)
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#define my_atomic_rwlock_wrunlock(name)
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#endif
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#endif /* ATOMIC_NOLOCK_INCLUDED */
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