FreeBSD/Linux Kernel Cross Reference
sys/i386/include/runq.h

     /*-
      * Copyright (c) 2001 Jake Burkholder <jake@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 AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_RUNQ_H_
    #define _MACHINE_RUNQ_H_
    
    #define RQB_LEN         (2)             /* Number of priority status words. */
    #define RQB_L2BPW       (5)             /* Log2(sizeof(rqb_word_t) * NBBY)). */
    #define RQB_BPW         (1<<RQB_L2BPW)  /* Bits in an rqb_word_t. */
    
    #define RQB_BIT(pri)    (1 << ((pri) & (RQB_BPW - 1)))
    #define RQB_WORD(pri)   ((pri) >> RQB_L2BPW)
    
    #define RQB_FFS(word)   (ffs(word) - 1)
    
    /*
     * Type of run queue status word.
     */
    typedef u_int32_t       rqb_word_t;
    
    #endif

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