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 | |