Provide __atomic_compare_exchange_N (as needed for the C11 2011 <atomic>
ops) via the corresponding CAS.
This commit is contained in:
martin
parent
7158cf9422
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52
common/lib/libc/atomic/atomic_c11_compare_exchange_cas_16.c
Normal file
52
common/lib/libc/atomic/atomic_c11_compare_exchange_cas_16.c
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/* $NetBSD: atomic_c11_compare_exchange_cas_16.c,v 1.1 2014/10/12 17:51:47 martin Exp $ */
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/*-
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* Copyright (c) 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Martin Husemann.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "atomic_op_namespace.h"
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#if !defined(_KERNEL) && !defined(_STANDALONE)
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#include <stdbool.h>
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#endif
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#include <sys/atomic.h>
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bool
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__atomic_compare_exchange_2(volatile uint16_t *mem,
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uint16_t *expected, uint16_t desired,
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bool weak, int success, int failure)
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{
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uint16_t old = *expected;
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/*
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* Ignore the details (weak, memory model on success and failure)
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* and just do the cas. If we get here the compiler couldn't
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* do better and it mostly will not matter at all.
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*/
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return atomic_cas_16(mem, old, desired) == old;
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}
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52
common/lib/libc/atomic/atomic_c11_compare_exchange_cas_32.c
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52
common/lib/libc/atomic/atomic_c11_compare_exchange_cas_32.c
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/* $NetBSD: atomic_c11_compare_exchange_cas_32.c,v 1.1 2014/10/12 17:51:47 martin Exp $ */
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/*-
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* Copyright (c) 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Martin Husemann.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "atomic_op_namespace.h"
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#if !defined(_KERNEL) && !defined(_STANDALONE)
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#include <stdbool.h>
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#endif
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#include <sys/atomic.h>
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bool
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__atomic_compare_exchange_4(volatile uint32_t *mem,
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uint32_t *expected, uint32_t desired,
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bool weak, int success, int failure)
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{
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uint32_t old = *expected;
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/*
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* Ignore the details (weak, memory model on success and failure)
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* and just do the cas. If we get here the compiler couldn't
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* do better and it mostly will not matter at all.
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*/
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return atomic_cas_32(mem, old, desired) == old;
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}
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52
common/lib/libc/atomic/atomic_c11_compare_exchange_cas_8.c
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52
common/lib/libc/atomic/atomic_c11_compare_exchange_cas_8.c
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/* $NetBSD: atomic_c11_compare_exchange_cas_8.c,v 1.1 2014/10/12 17:51:47 martin Exp $ */
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/*-
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* Copyright (c) 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Martin Husemann.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "atomic_op_namespace.h"
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#if !defined(_KERNEL) && !defined(_STANDALONE)
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#include <stdbool.h>
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#endif
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#include <sys/atomic.h>
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bool
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__atomic_compare_exchange_1(volatile uint8_t *mem,
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uint8_t *expected, uint8_t desired,
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bool weak, int success, int failure)
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{
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uint8_t old = *expected;
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/*
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* Ignore the details (weak, memory model on success and failure)
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* and just do the cas. If we get here the compiler couldn't
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* do better and it mostly will not matter at all.
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*/
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return atomic_cas_8(mem, old, desired) == old;
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}
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