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/_unrhdr.h

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    1 /*-
    2  * Copyright (c) 2004 Poul-Henning Kamp
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/11.0/sys/sys/_unrhdr.h 255057 2013-08-30 07:37:45Z kib $
   27  */
   28 
   29 #ifndef _SYS_UNRHDR_H
   30 #define _SYS_UNRHDR_H
   31 
   32 #include <sys/queue.h>
   33 
   34 struct mtx;
   35 
   36 /* Header element for a unr number space. */
   37 
   38 struct unrhdr {
   39         TAILQ_HEAD(unrhd,unr)   head;
   40         u_int                   low;    /* Lowest item */
   41         u_int                   high;   /* Highest item */
   42         u_int                   busy;   /* Count of allocated items */
   43         u_int                   alloc;  /* Count of memory allocations */
   44         u_int                   first;  /* items in allocated from start */
   45         u_int                   last;   /* items free at end */
   46         struct mtx              *mtx;
   47         TAILQ_HEAD(unrfr,unr)   ppfree; /* Items to be freed after mtx
   48                                            lock dropped */
   49 };
   50 
   51 #endif

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