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87 lines
3.4 KiB
C
87 lines
3.4 KiB
C
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/*
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* Copyright (c) 2003 by Hewlett-Packard Company. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/*
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* Ensure, if at all possible, that AO_compare_and_swap_full() is
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* available. The emulation should be brute-force signal-safe, even
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* though it actually blocks.
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* Including this file will generate an error if AO_compare_and_swap_full()
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* cannot be made available.
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* This will be included from platform-specific atomic_ops files
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* if appropriate, and if AO_REQUIRE_CAS is defined. It should not be
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* included directly, especially since it affects the implementation
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* of other atomic update primitives.
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* The implementation assumes that only AO_store_XXX and AO_test_and_set_XXX
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* variants are defined, and that AO_test_and_set_XXX is not used to
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* operate on compare_and_swap locations.
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*/
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#ifndef AO_ATOMIC_OPS_H
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# error This file should not be included directly.
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#endif
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#ifndef AO_HAVE_double_t
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# include "standard_ao_double_t.h"
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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AO_t AO_fetch_compare_and_swap_emulation(volatile AO_t *addr, AO_t old_val,
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AO_t new_val);
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int AO_compare_double_and_swap_double_emulation(volatile AO_double_t *addr,
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AO_t old_val1, AO_t old_val2,
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AO_t new_val1, AO_t new_val2);
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void AO_store_full_emulation(volatile AO_t *addr, AO_t val);
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#ifndef AO_HAVE_fetch_compare_and_swap_full
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# define AO_fetch_compare_and_swap_full(addr, old, newval) \
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AO_fetch_compare_and_swap_emulation(addr, old, newval)
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# define AO_HAVE_fetch_compare_and_swap_full
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#endif
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#ifndef AO_HAVE_compare_double_and_swap_double_full
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# define AO_compare_double_and_swap_double_full(addr, old1, old2, \
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newval1, newval2) \
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AO_compare_double_and_swap_double_emulation(addr, old1, old2, \
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newval1, newval2)
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# define AO_HAVE_compare_double_and_swap_double_full
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#endif
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#undef AO_store
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#undef AO_HAVE_store
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#undef AO_store_write
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#undef AO_HAVE_store_write
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#undef AO_store_release
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#undef AO_HAVE_store_release
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#undef AO_store_full
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#undef AO_HAVE_store_full
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#define AO_store_full(addr, val) AO_store_full_emulation(addr, val)
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#define AO_HAVE_store_full
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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