93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/*
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Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights
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reserved.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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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., 51 Franklin St, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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#ifndef NDBMEMCACHE_ATOMIC_H
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#define NDBMEMCACHE_ATOMIC_H
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#include "ndbmemcache_config.h"
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#include "ndbmemcache_global.h"
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/* This section of code determines which library to use; it is possible that
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more than one of them is available, so they are tested in order of
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preference.
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*/
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#if defined HAVE_SOLARIS_ATOMICS
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#define USE_SOLARIS_ATOMICS
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#elif defined HAVE_DARWIN_ATOMICS
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#define USE_DARWIN_ATOMICS
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#elif defined HAVE_GCC_ATOMIC_BUILTINS || defined HAVE_GCC_ATOMICS_WITH_ARCH_FLAG
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#define USE_GCC_ATOMICS
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#else
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#error No atomic functions available.
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#endif
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/* The next section selects needed headers for the chosen functions.
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*/
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#if defined USE_DARWIN_ATOMICS
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#include <libkern/OSAtomic.h>
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#elif defined USE_SOLARIS_ATOMICS
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#include <atomic.h>
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#elif defined USE_GCC_ATOMICS
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/* No header file required for GCC intrinsic atomic functions */
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#endif
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/* Some native atomic functions want signed ints, and others want unsigned ints.
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In all cases the values are declared "volatile".
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We define a type here.
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*/
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#ifdef USE_DARWIN_ATOMICS
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typedef volatile Int32 atomic_int32_t;
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#else
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typedef volatile Uint32 atomic_int32_t;
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#endif
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/* With Darwin atomics and gcc intrinsic atomics, some calls are macros.
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*/
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DECLARE_FUNCTIONS_WITH_C_LINKAGE
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#ifdef USE_DARWIN_ATOMICS
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#define atomic_cmp_swap_int(loc, old, new) OSAtomicCompareAndSwap32Barrier(old, new, loc)
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void atomic_set_ptr(void * volatile * target, void *);
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#define atomic_barrier() OSMemoryBarrier()
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#elif defined USE_GCC_ATOMICS
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#define atomic_cmp_swap_int(loc, old, new) \
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__sync_bool_compare_and_swap(loc, (Uint32) old, (Uint32) new)
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void atomic_set_ptr(void * volatile * target, void *);
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#define atomic_barrier() __sync_synchronize()
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#elif defined USE_SOLARIS_ATOMICS
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int atomic_cmp_swap_int(atomic_int32_t *loc, int oldvalue, int newvalue);
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void atomic_set_ptr(void * volatile * target, void *);
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#define atomic_barrier()
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#else
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#error No atomic functions selected.
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#endif
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END_FUNCTIONS_WITH_C_LINKAGE
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#endif
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