sys/kern/subr_bufring.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. The name of Kip Macy nor the names of other
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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);
}
1	/**************************************************************************
2	*
3	* Copyright (c) 2007,2008 Kip Macy kmacy@freebsd.org
4	* All rights reserved.
5	*
6	* Redistribution and use in source and binary forms, with or without
7	* modification, are permitted provided that the following conditions are met:
8	*
9	* 1. Redistributions of source code must retain the above copyright notice,
10	* this list of conditions and the following disclaimer.
11	*
12	* 2. The name of Kip Macy nor the names of other
13	* contributors may be used to endorse or promote products derived from
14	* this software without specific prior written permission.
15	*
16	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17	* AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
20	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26	* POSSIBILITY OF SUCH DAMAGE.
27	*
28	*
29	***************************************************************************/
30	#include <sys/cdefs.h>
31	__FBSDID("$FreeBSD$");
32
33
34	#include <sys/param.h>
35	#include <sys/systm.h>
36	#include <sys/kernel.h>
37	#include <sys/malloc.h>
38	#include <sys/ktr.h>
39	#include <sys/buf_ring.h>
40
41
42	struct buf_ring *
43	buf_ring_alloc(int count, struct malloc_type type, int flags, struct mtx lock)
44	{
45	struct buf_ring *br;
46
47	KASSERT(powerof2(count), ("buf ring must be size power of 2"));
48
49	br = malloc(sizeof(struct buf_ring) + count*sizeof(caddr_t),
50	type, flags\|M_ZERO);
51	if (br == NULL)
52	return (NULL);
53	#ifdef DEBUG_BUFRING
54	br->br_lock = lock;
55	#endif
56	br->br_prod_size = br->br_cons_size = count;
57	br->br_prod_mask = br->br_cons_mask = count-1;
58	br->br_prod_head = br->br_cons_head = 0;
59	br->br_prod_tail = br->br_cons_tail = 0;
60
61	return (br);
62	}
63
64	void
65	buf_ring_free(struct buf_ring br, struct malloc_type type)
66	{
67	free(br, type);
68	}
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