The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/_bitset.h

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    1 /*-
    2  * Copyright (c) 2008, Jeffrey Roberson <jeff@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Copyright (c) 2008 Nokia Corporation
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice unmodified, this list of conditions, and the following
   13  *    disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * $FreeBSD$
   30  */
   31 
   32 #ifndef _SYS__BITSET_H_
   33 #define _SYS__BITSET_H_
   34 
   35 /*
   36  * Macros addressing word and bit within it, tuned to make compiler
   37  * optimize cases when SETSIZE fits into single machine word.
   38  */
   39 #define _BITSET_BITS            (sizeof(long) * 8)
   40 
   41 #define __howmany(x, y) (((x) + ((y) - 1)) / (y))
   42 
   43 #define __bitset_words(_s)      (__howmany(_s, _BITSET_BITS))
   44 
   45 #define BITSET_DEFINE(t, _s)                                            \
   46 struct t {                                                              \
   47         long    __bits[__bitset_words((_s))];                           \
   48 }
   49 
   50 /*
   51  * Helper to declare a bitset without it's size being a constant.
   52  *
   53  * Sadly we cannot declare a bitset struct with '__bits[]', because it's
   54  * the only member of the struct and the compiler complains.
   55  */
   56 #define BITSET_DEFINE_VAR(t)    BITSET_DEFINE(t, 1)
   57 
   58 #endif /* !_SYS__BITSET_H_ */

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