xref: /src/sys/external/bsd/drm2/include/linux/kfifo.h

/*	$NetBSD: kfifo.h,v 1.1 2014/07/16 20:56:25 riastradh Exp $	*/

/*-
 * Copyright (c) 2014 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Taylor R. Campbell.
 *
 * 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. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#ifndef	_LINUX_KFIFO_H_
#define	_LINUX_KFIFO_H_

#include <sys/pcq.h>

#define	DECLARE_KFIFO_PTR(fifo, type)					      \
	struct {							      \
		pcq_t	*pcq;						      \
		type	*dummy;						      \
	} fifo

#define	kfifo_put(fifo, item)						      \
	pcq_put((fifo)->pcq, __UNCONST((const char *)(item) +		      \
		0*sizeof((item) == *(fifo)->dummy)))
#define	kfifo_get(fifo, itemp)						      \
	((*((itemp) + 0*sizeof((itemp) - (fifo)->dummy)) =		      \
	    pcq_get((fifo)->pcq)) != NULL)

#define	kfifo_is_empty(fifo)						      \
	(pcq_peek((fifo)->pcq) == NULL)

#define	kfifo_alloc(fifo, size, gfp)					      \
	(((fifo)->pcq = pcq_create((size),				      \
		ISSET((gfp), __GFP_WAIT)? KM_SLEEP : KM_NOSLEEP))	      \
	    == NULL? -ENOMEM : 0)

#define	kfifo_free(fifo)						      \
	pcq_destroy((fifo)->pcq)

#endif	/* _LINUX_KFIFO_H_ */