| 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 | |