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850108c0b4
instead of long types for low-level locks. Add prototypes for some internal libc functions that are wrapped by the library as cancellation points. Add memory barriers to alpha atomic swap functions (submitted by davidxu). Requested by: bde
73 lines
2.8 KiB
C
73 lines
2.8 KiB
C
/*-
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* Copyright (c) 2003 Daniel Eischen <deischen@FreeBSD.org>
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* All rights reserved.
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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. Neither the name of the author nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _ATOMIC_OPS_H_
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#define _ATOMIC_OPS_H_
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/*
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* Atomic swap:
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* Atomic (tmp = *dst, *dst = val), then *res = tmp
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*
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* void atomic_swap_long(long *dst, long val, long *res);
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*/
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static inline void
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atomic_swap_long(long *dst, long val, long *res)
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{
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/* $1 and $2 are t0 and t1 respectively. */
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__asm ( " ldq $1, %1\n" /* get cache line before lock */
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"1: ldq_l $1, %1\n" /* load *dst asserting lock */
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" mov %2, $2\n" /* save value to be swapped */
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" stq_c $2, %1\n" /* attempt the store; $2 clobbered */
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" beq $2, 1b\n" /* it didn't work, loop */
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" stq $1, %0\n" /* save value of *dst in *res */
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" mb \n"
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: "+m"(*res)
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: "m"(*dst), "r"(val)
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: "memory", "$1", "$2"); /* clobber t0 and t1 */
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}
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static inline void
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atomic_swap_int(int *dst, int val, int *res)
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{
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/* $1 and $2 are t0 and t1 respectively. */
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__asm ( " ldl $1, %1\n" /* get cache line before lock */
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"1: ldl_l $1, %1\n" /* load *dst asserting lock */
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" mov %2, $2\n" /* save value to be swapped */
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" stl_c $2, %1\n" /* attempt the store; $2 clobbered */
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" beq $2, 1b\n" /* it didn't work, loop */
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" stl $1, %0\n" /* save value of *dst in *res */
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" mb \n"
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: "+m"(*res)
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: "m"(*dst), "r"(val)
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: "memory", "$1", "$2"); /* clobber t0 and t1 */
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}
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#define atomic_swap_ptr(d, v, r) \
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atomic_swap_long((long *)(d), (long)(v), (long *)(r))
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#endif
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