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