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queue.h
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queue.h
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/* Copyright (c) 2013, Ben Noordhuis <[email protected]>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef QUEUE_H_
#define QUEUE_H_
#include <stdint.h>
typedef void *QUEUE[2];
/* Private macros. */
#define QUEUE_NEXT(q) ((*(q))[0])
#define QUEUE_PREV(q) ((*(q))[1])
#define QUEUE_PREV_NEXT(q) (QUEUE_NEXT((QUEUE *) QUEUE_PREV(q)))
#define QUEUE_NEXT_PREV(q) (QUEUE_PREV((QUEUE *) QUEUE_NEXT(q)))
/* Public macros. */
#define QUEUE_DATA(ptr, type, field) \
((type *) ((char *) (ptr) - ((uintptr_t) &((type *) 0)->field)))
#define QUEUE_FOREACH(q, h) \
for ((q) = (QUEUE *) (*(h))[0]; (q) != (h); (q) = (QUEUE *) (*(q))[0])
#define QUEUE_EMPTY(q) \
(QUEUE_NEXT(q) == (q))
#define QUEUE_HEAD(q) \
(QUEUE_NEXT(q))
#define QUEUE_INIT(q) \
do { \
QUEUE_NEXT(q) = (q); \
QUEUE_PREV(q) = (q); \
} \
while (0)
#define QUEUE_ADD(h, n) \
do { \
QUEUE_PREV_NEXT(h) = QUEUE_NEXT(n); \
QUEUE_NEXT_PREV(n) = QUEUE_PREV(h); \
QUEUE_PREV(h) = QUEUE_PREV(n); \
QUEUE_PREV_NEXT(h) = (h); \
} \
while (0)
#define QUEUE_SPLIT(h, q, n) \
do { \
QUEUE_PREV(n) = QUEUE_PREV(h); \
QUEUE_PREV_NEXT(n) = (n); \
QUEUE_NEXT(n) = (q); \
QUEUE_PREV(h) = QUEUE_PREV(q); \
QUEUE_PREV_NEXT(h) = (h); \
QUEUE_PREV(q) = (n); \
} \
while (0)
#define QUEUE_INSERT_HEAD(h, q) \
do { \
QUEUE_NEXT(q) = QUEUE_NEXT(h); \
QUEUE_PREV(q) = (h); \
QUEUE_NEXT_PREV(q) = (q); \
QUEUE_NEXT(h) = (q); \
} \
while (0)
#define QUEUE_INSERT_TAIL(h, q) \
do { \
QUEUE_NEXT(q) = (h); \
QUEUE_PREV(q) = QUEUE_PREV(h); \
QUEUE_PREV_NEXT(q) = (q); \
QUEUE_PREV(h) = (q); \
} \
while (0)
#define QUEUE_REMOVE(q) \
do { \
QUEUE_PREV_NEXT(q) = QUEUE_NEXT(q); \
QUEUE_NEXT_PREV(q) = QUEUE_PREV(q); \
} \
while (0)
// Make head through q the new tail, q->next through tail the new head.
// Note that this is a no-op if QUEUE_NEXT(q) == (h).
#define QUEUE_ROTATE(h, q) \
if (QUEUE_NEXT(q) != (h)) { \
QUEUE_NEXT_PREV(h) = QUEUE_PREV(h); \
QUEUE_PREV_NEXT(h) = QUEUE_NEXT(h); \
QUEUE_PREV(h) = (q); \
QUEUE_NEXT(h) = QUEUE_NEXT(q); \
QUEUE_PREV_NEXT(h) = (h); \
QUEUE_NEXT_PREV(h) = (h); \
}
#endif /* QUEUE_H_ */