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

     /*-
      * Copyright (c) 2010 Isilon Systems, Inc.
      * Copyright (c) 2010 iX Systems, Inc.
      * Copyright (c) 2010 Panasas, Inc.
      * Copyright (c) 2013, 2014 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_RWLOCK_H_
    #define _LINUXKPI_LINUX_RWLOCK_H_
    
    #include <sys/types.h>
    #include <sys/lock.h>
    #include <sys/rwlock.h>
    #include <sys/libkern.h>
    
    typedef struct {
            struct rwlock rw;
    } rwlock_t;
    
    #define read_lock(_l)           rw_rlock(&(_l)->rw)
    #define write_lock(_l)          rw_wlock(&(_l)->rw)
    #define read_unlock(_l)         rw_runlock(&(_l)->rw)
    #define write_unlock(_l)        rw_wunlock(&(_l)->rw)
    #define read_lock_irq(lock)     read_lock((lock))
    #define read_unlock_irq(lock)   read_unlock((lock))
    #define write_lock_irq(lock)    write_lock((lock))
    #define write_unlock_irq(lock)  write_unlock((lock))
    #define read_lock_irqsave(lock, flags)                                  \
        do {(flags) = 0; read_lock(lock); } while (0)
    #define write_lock_irqsave(lock, flags)                                 \
        do {(flags) = 0; write_lock(lock); } while (0)
    #define read_unlock_irqrestore(lock, flags)                             \
        do { read_unlock(lock); } while (0)
    #define write_unlock_irqrestore(lock, flags)                            \
        do { write_unlock(lock); } while (0)
    
    static inline void
    rwlock_init(rwlock_t *lock)
    {
    
            memset(&lock->rw, 0, sizeof(lock->rw));
            rw_init_flags(&lock->rw, "lnxrw", RW_NOWITNESS);
    }
    
    #endif  /* _LINUXKPI_LINUX_RWLOCK_H_ */

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