FreeBSD/Linux Kernel Cross Reference
sys/cddl/compat/opensolaris/kern/opensolaris_atomic.c

     /*-
      * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/atomic.h>
    
    #if !defined(__LP64__) && !defined(__mips_n32) && \
        !defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64) && \
        !defined(HAS_EMULATED_ATOMIC64)
    
    #ifdef _KERNEL
    #include <sys/kernel.h>
    
    struct mtx atomic_mtx;
    MTX_SYSINIT(atomic, &atomic_mtx, "atomic", MTX_DEF);
    #else
    #include <pthread.h>
    
    #define mtx_lock(lock)          pthread_mutex_lock(lock)
    #define mtx_unlock(lock)        pthread_mutex_unlock(lock)
    
    static pthread_mutex_t atomic_mtx;
    
    static __attribute__((constructor)) void
    atomic_init(void)
    {
            pthread_mutex_init(&atomic_mtx, NULL);
    }
    #endif
    
    void
    atomic_add_64(volatile uint64_t *target, int64_t delta)
    {
    
            mtx_lock(&atomic_mtx);
            *target += delta;
            mtx_unlock(&atomic_mtx);
    }
    
    void
    atomic_dec_64(volatile uint64_t *target)
    {
    
            mtx_lock(&atomic_mtx);
            *target -= 1;
            mtx_unlock(&atomic_mtx);
    }
    
    uint64_t
    atomic_swap_64(volatile uint64_t *a, uint64_t value)
    {
            uint64_t ret;
    
            mtx_lock(&atomic_mtx);
            ret = *a;
            *a = value;
            mtx_unlock(&atomic_mtx);
            return (ret);
    }
    
    uint64_t
    atomic_load_64(volatile uint64_t *a)
    {
            uint64_t ret;
    
            mtx_lock(&atomic_mtx);
            ret = *a;
            mtx_unlock(&atomic_mtx);
            return (ret);
    }
    
   uint64_t
   atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
   {
           uint64_t newval;
   
           mtx_lock(&atomic_mtx);
           newval = (*target += delta);
           mtx_unlock(&atomic_mtx);
           return (newval);
   }
   
   uint64_t
   atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
   {
           uint64_t oldval;
   
           mtx_lock(&atomic_mtx);
           oldval = *target;
           if (oldval == cmp)
                   *target = newval;
           mtx_unlock(&atomic_mtx);
           return (oldval);
   }
   #endif

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