FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/srcu.h

     /*-
      * Copyright (c) 2015-2020 Mellanox Technologies, Ltd.
      * 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 unmodified, 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 AUTHOR ``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 AUTHOR 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _LINUXKPI_LINUX_SRCU_H_
    #define _LINUXKPI_LINUX_SRCU_H_
    
    #include <linux/compiler.h>
    
    struct srcu_struct {
    };
    
    #define srcu_dereference(p, srcu) \
            ((__typeof(*(p)) *)READ_ONCE(p))
    
    #define DEFINE_STATIC_SRCU(name) \
            static struct srcu_struct name
    
    /* prototypes */
    
    extern int srcu_read_lock(struct srcu_struct *);
    extern void srcu_read_unlock(struct srcu_struct *, int index);
    extern void synchronize_srcu(struct srcu_struct *);
    extern void srcu_barrier(struct srcu_struct *);
    extern int init_srcu_struct(struct srcu_struct *);
    extern void cleanup_srcu_struct(struct srcu_struct *);
    
    #define synchronize_srcu_expedited(srcu) do {   \
            synchronize_srcu(srcu);                 \
    } while (0)
    
    #endif                                  /* _LINUXKPI_LINUX_SRCU_H_ */

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