spl_atomic.c

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    1 /*
    2  * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/lock.h>
   32 #include <sys/mutex.h>
   33 #include <sys/atomic.h>
   34 
   35 #if !defined(__LP64__) && !defined(__mips_n32) && \
   36         !defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64) && \
   37         !defined(HAS_EMULATED_ATOMIC64)
   38 
   39 #ifdef _KERNEL
   40 #include <sys/kernel.h>
   41 
   42 struct mtx atomic_mtx;
   43 MTX_SYSINIT(atomic, &atomic_mtx, "atomic", MTX_DEF);
   44 #else
   45 #include <pthread.h>
   46 
   47 #define mtx_lock(lock)          pthread_mutex_lock(lock)
   48 #define mtx_unlock(lock)        pthread_mutex_unlock(lock)
   49 
   50 static pthread_mutex_t atomic_mtx;
   51 
   52 static __attribute__((constructor)) void
   53 atomic_init(void)
   54 {
   55         pthread_mutex_init(&atomic_mtx, NULL);
   56 }
   57 #endif
   58 
   59 void
   60 atomic_add_64(volatile uint64_t *target, int64_t delta)
   61 {
   62 
   63         mtx_lock(&atomic_mtx);
   64         *target += delta;
   65         mtx_unlock(&atomic_mtx);
   66 }
   67 
   68 void
   69 atomic_dec_64(volatile uint64_t *target)
   70 {
   71 
   72         mtx_lock(&atomic_mtx);
   73         *target -= 1;
   74         mtx_unlock(&atomic_mtx);
   75 }
   76 
   77 uint64_t
   78 atomic_swap_64(volatile uint64_t *a, uint64_t value)
   79 {
   80         uint64_t ret;
   81 
   82         mtx_lock(&atomic_mtx);
   83         ret = *a;
   84         *a = value;
   85         mtx_unlock(&atomic_mtx);
   86         return (ret);
   87 }
   88 
   89 uint64_t
   90 atomic_load_64(volatile uint64_t *a)
   91 {
   92         uint64_t ret;
   93 
   94         mtx_lock(&atomic_mtx);
   95         ret = *a;
   96         mtx_unlock(&atomic_mtx);
   97         return (ret);
   98 }
   99 
  100 uint64_t
  101 atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
  102 {
  103         uint64_t newval;
  104 
  105         mtx_lock(&atomic_mtx);
  106         newval = (*target += delta);
  107         mtx_unlock(&atomic_mtx);
  108         return (newval);
  109 }
  110 
  111 uint64_t
  112 atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
  113 {
  114         uint64_t oldval;
  115 
  116         mtx_lock(&atomic_mtx);
  117         oldval = *target;
  118         if (oldval == cmp)
  119                 *target = newval;
  120         mtx_unlock(&atomic_mtx);
  121         return (oldval);
  122 }
  123 #endif

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/module/os/freebsd/spl/spl_atomic.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/os/freebsd/spl/spl_atomic.c