121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/*
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* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@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. 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 AUTHORS 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 AUTHORS 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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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/atomic.h>
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#if !defined(__LP64__) && !defined(__mips_n32) && \
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!defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64) && \
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!defined(HAS_EMULATED_ATOMIC64)
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#ifdef _KERNEL
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#include <sys/kernel.h>
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struct mtx atomic_mtx;
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MTX_SYSINIT(atomic, &atomic_mtx, "atomic", MTX_DEF);
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#else
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#include <pthread.h>
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#define mtx_lock(lock) pthread_mutex_lock(lock)
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#define mtx_unlock(lock) pthread_mutex_unlock(lock)
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static pthread_mutex_t atomic_mtx;
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static __attribute__((constructor)) void
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atomic_init(void)
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{
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pthread_mutex_init(&atomic_mtx, NULL);
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}
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#endif
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void
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atomic_add_64(volatile uint64_t *target, int64_t delta)
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{
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mtx_lock(&atomic_mtx);
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*target += delta;
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mtx_unlock(&atomic_mtx);
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}
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void
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atomic_dec_64(volatile uint64_t *target)
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{
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mtx_lock(&atomic_mtx);
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*target -= 1;
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mtx_unlock(&atomic_mtx);
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}
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uint64_t
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atomic_swap_64(volatile uint64_t *a, uint64_t value)
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{
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uint64_t ret;
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mtx_lock(&atomic_mtx);
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ret = *a;
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*a = value;
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mtx_unlock(&atomic_mtx);
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return (ret);
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}
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uint64_t
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atomic_load_64(volatile uint64_t *a)
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{
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uint64_t ret;
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mtx_lock(&atomic_mtx);
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ret = *a;
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mtx_unlock(&atomic_mtx);
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return (ret);
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}
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uint64_t
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atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
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{
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uint64_t newval;
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mtx_lock(&atomic_mtx);
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newval = (*target += delta);
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mtx_unlock(&atomic_mtx);
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return (newval);
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}
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uint64_t
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atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
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{
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uint64_t oldval;
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mtx_lock(&atomic_mtx);
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oldval = *target;
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if (oldval == cmp)
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*target = newval;
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mtx_unlock(&atomic_mtx);
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return (oldval);
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}
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#endif
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