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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_bufring.c

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    1 /*-
    2  * Copyright (c) 2007, 2008 Kip Macy <kmacy@freebsd.org>
    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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.2/sys/kern/subr_bufring.c 209061 2010-06-11 19:17:36Z ken $");
   29 
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/kernel.h>
   34 #include <sys/malloc.h>
   35 #include <sys/ktr.h>
   36 #include <sys/buf_ring.h>
   37 
   38 
   39 struct buf_ring *
   40 buf_ring_alloc(int count, struct malloc_type *type, int flags, struct mtx *lock)
   41 {
   42         struct buf_ring *br;
   43 
   44         KASSERT(powerof2(count), ("buf ring must be size power of 2"));
   45         
   46         br = malloc(sizeof(struct buf_ring) + count*sizeof(caddr_t),
   47             type, flags|M_ZERO);
   48         if (br == NULL)
   49                 return (NULL);
   50 #ifdef DEBUG_BUFRING
   51         br->br_lock = lock;
   52 #endif  
   53         br->br_prod_size = br->br_cons_size = count;
   54         br->br_prod_mask = br->br_cons_mask = count-1;
   55         br->br_prod_head = br->br_cons_head = 0;
   56         br->br_prod_tail = br->br_cons_tail = 0;
   57                 
   58         return (br);
   59 }
   60 
   61 void
   62 buf_ring_free(struct buf_ring *br, struct malloc_type *type)
   63 {
   64         free(br, type);
   65 }

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