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2 * Copyright (C) 2015 Kunihiro Ishiguro
4 * This file is part of Quagga.
6 * Quagga is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2, or (at your option) any
11 * Quagga is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; see the file COPYING; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #ifndef __LIB_FIFO_H__
21 #define __LIB_FIFO_H__
23 /* FIFO -- first in first out structure and macros. */
29 #define FIFO_INIT(F) \
31 struct fifo *Xfifo = (struct fifo *)(F); \
32 Xfifo->next = Xfifo->prev = Xfifo; \
35 #define FIFO_ADD(F, N) \
37 struct fifo *Xfifo = (struct fifo *)(F); \
38 struct fifo *Xnode = (struct fifo *)(N); \
39 Xnode->next = Xfifo; \
40 Xnode->prev = Xfifo->prev; \
41 Xfifo->prev = Xfifo->prev->next = Xnode; \
46 struct fifo *Xnode = (struct fifo *)(N); \
47 Xnode->prev->next = Xnode->next; \
48 Xnode->next->prev = Xnode->prev; \
51 #define FIFO_HEAD(F) \
52 ((((struct fifo *)(F))->next == (struct fifo *)(F)) ? NULL : (F)->next)
54 #define FIFO_EMPTY(F) (((struct fifo *)(F))->next == (struct fifo *)(F))
56 #define FIFO_TOP(F) (FIFO_EMPTY(F) ? NULL : ((struct fifo *)(F))->next)
58 #endif /* __LIB_FIFO_H__ */