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/kern/subr_bufring.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2007, 2008 Kip Macy <kmacy@freebsd.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/12.0/sys/kern/subr_bufring.c 326271 2017-11-27 15:20:12Z pfg $");
   31 
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/kernel.h>
   36 #include <sys/malloc.h>
   37 #include <sys/ktr.h>
   38 #include <sys/buf_ring.h>
   39 
   40 
   41 struct buf_ring *
   42 buf_ring_alloc(int count, struct malloc_type *type, int flags, struct mtx *lock)
   43 {
   44         struct buf_ring *br;
   45 
   46         KASSERT(powerof2(count), ("buf ring must be size power of 2"));
   47         
   48         br = malloc(sizeof(struct buf_ring) + count*sizeof(caddr_t),
   49             type, flags|M_ZERO);
   50         if (br == NULL)
   51                 return (NULL);
   52 #ifdef DEBUG_BUFRING
   53         br->br_lock = lock;
   54 #endif  
   55         br->br_prod_size = br->br_cons_size = count;
   56         br->br_prod_mask = br->br_cons_mask = count-1;
   57         br->br_prod_head = br->br_cons_head = 0;
   58         br->br_prod_tail = br->br_cons_tail = 0;
   59                 
   60         return (br);
   61 }
   62 
   63 void
   64 buf_ring_free(struct buf_ring *br, struct malloc_type *type)
   65 {
   66         free(br, type);
   67 }

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