/usr/include/atomic_ops/sysdeps/int_aligned_atomic_load_store.h is in libatomic-ops-dev 7.2~alpha5+cvs20101124-1ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | /*
* Copyright (c) 2004 Hewlett-Packard Development Company, L.P.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/*
* Definitions for architectures on which loads and stores of unsigned int are
* atomic for all legal alignments.
*/
AO_INLINE unsigned int
AO_int_load(const volatile unsigned int *addr)
{
assert(((size_t)addr & (sizeof(unsigned int) - 1)) == 0);
/* Cast away the volatile for architectures like IA64 where */
/* volatile adds barrier semantics. */
return (*(unsigned int *)addr);
}
#define AO_HAVE_int_load
AO_INLINE void
AO_int_store(volatile unsigned int *addr, unsigned int new_val)
{
assert(((size_t)addr & (sizeof(unsigned int) - 1)) == 0);
(*(unsigned int *)addr) = new_val;
}
#define AO_HAVE_int_store
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