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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2008, Jeffrey Roberson <jeff@freebsd.org>
    5  * All rights reserved.
    6  *
    7  * Copyright (c) 2008 Nokia Corporation
    8  * All rights reserved.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice unmodified, this list of conditions, and the following
   15  *    disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  *
   31  * $FreeBSD: head/sys/sys/_bitset.h 331723 2018-03-29 02:54:50Z jeff $
   32  */
   33 
   34 #ifndef _SYS__BITSET_H_
   35 #define _SYS__BITSET_H_
   36 
   37 /*
   38  * Macros addressing word and bit within it, tuned to make compiler
   39  * optimize cases when SETSIZE fits into single machine word.
   40  */
   41 #define _BITSET_BITS            (sizeof(long) * 8)
   42 
   43 #define __howmany(x, y) (((x) + ((y) - 1)) / (y))
   44 
   45 #define __bitset_words(_s)      (__howmany(_s, _BITSET_BITS))
   46 
   47 #define BITSET_DEFINE(t, _s)                                            \
   48 struct t {                                                              \
   49         long    __bits[__bitset_words((_s))];                           \
   50 }
   51 
   52 /*
   53  * Helper to declare a bitset without it's size being a constant.
   54  *
   55  * Sadly we cannot declare a bitset struct with '__bits[]', because it's
   56  * the only member of the struct and the compiler complains.
   57  */
   58 #define BITSET_DEFINE_VAR(t)    BITSET_DEFINE(t, 1)
   59 
   60 /*
   61  * Define a default type that can be used while manually specifying size
   62  * to every call.
   63  */
   64 BITSET_DEFINE(bitset, 1);
   65 
   66 #endif /* !_SYS__BITSET_H_ */

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