mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-21 11:13:30 +00:00
66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
/*-
|
|
* Copyright (c) 2007, 2008 Kip Macy <kmacy@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/ktr.h>
|
|
#include <sys/buf_ring.h>
|
|
|
|
|
|
struct buf_ring *
|
|
buf_ring_alloc(int count, struct malloc_type *type, int flags, struct mtx *lock)
|
|
{
|
|
struct buf_ring *br;
|
|
|
|
KASSERT(powerof2(count), ("buf ring must be size power of 2"));
|
|
|
|
br = malloc(sizeof(struct buf_ring) + count*sizeof(caddr_t),
|
|
type, flags|M_ZERO);
|
|
if (br == NULL)
|
|
return (NULL);
|
|
#ifdef DEBUG_BUFRING
|
|
br->br_lock = lock;
|
|
#endif
|
|
br->br_prod_size = br->br_cons_size = count;
|
|
br->br_prod_mask = br->br_cons_mask = count-1;
|
|
br->br_prod_head = br->br_cons_head = 0;
|
|
br->br_prod_tail = br->br_cons_tail = 0;
|
|
|
|
return (br);
|
|
}
|
|
|
|
void
|
|
buf_ring_free(struct buf_ring *br, struct malloc_type *type)
|
|
{
|
|
free(br, type);
|
|
}
|