1/* $NetBSD: kfifo.h,v 1.1 2014/07/16 20:56:25 riastradh Exp $ */
2
3/*-
4 * Copyright (c) 2014 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _LINUX_KFIFO_H_
33#define _LINUX_KFIFO_H_
34
35#include <sys/pcq.h>
36
37#define DECLARE_KFIFO_PTR(fifo, type) \
38 struct { \
39 pcq_t *pcq; \
40 type *dummy; \
41 } fifo
42
43#define kfifo_put(fifo, item) \
44 pcq_put((fifo)->pcq, __UNCONST((const char *)(item) + \
45 0*sizeof((item) == *(fifo)->dummy)))
46#define kfifo_get(fifo, itemp) \
47 ((*((itemp) + 0*sizeof((itemp) - (fifo)->dummy)) = \
48 pcq_get((fifo)->pcq)) != NULL)
49
50#define kfifo_is_empty(fifo) \
51 (pcq_peek((fifo)->pcq) == NULL)
52
53#define kfifo_alloc(fifo, size, gfp) \
54 (((fifo)->pcq = pcq_create((size), \
55 ISSET((gfp), __GFP_WAIT)? KM_SLEEP : KM_NOSLEEP)) \
56 == NULL? -ENOMEM : 0)
57
58#define kfifo_free(fifo) \
59 pcq_destroy((fifo)->pcq)
60
61#endif /* _LINUX_KFIFO_H_ */
62