FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/semaphore.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_SEMAPHORE_H_
    #define _LINUXKPI_LINUX_SEMAPHORE_H_
    
    #include <sys/param.h>
    #include <sys/lock.h>
    #include <sys/sema.h>
    #include <sys/libkern.h>
    
    /*
     * XXX BSD semaphores are disused and slow.  They also do not provide a
     * sema_wait_sig method.  This must be resolved eventually.
     */
    struct semaphore {
            struct sema     sema;
    };
    
    #define down(_sem)                      sema_wait(&(_sem)->sema)
    #define down_interruptible(_sem)        sema_wait(&(_sem)->sema), 0
    #define down_trylock(_sem)              !sema_trywait(&(_sem)->sema)
    #define up(_sem)                        sema_post(&(_sem)->sema)
    
    static inline void
    linux_sema_init(struct semaphore *sem, int val)
    {
    
            memset(&sem->sema, 0, sizeof(sem->sema));
            sema_init(&sem->sema, val, "lnxsema");
    }
    
    static inline void
    init_MUTEX(struct semaphore *sem)
    {
    
            memset(&sem->sema, 0, sizeof(sem->sema));
            sema_init(&sem->sema, 1, "lnxsema");
    }
    
    #define sema_init(...)  linux_sema_init(__VA_ARGS__)
    
    #endif /* _LINUXKPI_LINUX_SEMAPHORE_H_ */

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