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Add five macros to TAILQ family to improve readability.

This commit is contained in:
Poul-Henning Kamp 1996-04-08 07:51:57 +00:00
parent afe9fcd5d6
commit d19287f2e9
1 changed files with 9 additions and 1 deletions
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10
sys/sys/queue.h
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)queue.h 8.5 (Berkeley) 8/20/94
* $Id: queue.h,v 1.7 1996/03/11 02:14:38 hsu Exp $
* $Id: queue.h,v 1.8 1996/03/31 03:21:45 gibbs Exp $
*/
#ifndef _SYS_QUEUE_H_
@ -262,6 +262,14 @@ struct { \
/*
* Tail queue functions.
*/
#define TAILQ_EMPTY(head) ((head)->tqh_first == NULL)
#define TAILQ_FIRST(head) ((head)->tqh_first)
#define TAILQ_LAST(head) ((head)->tqh_last)
#define TAILQ_NEXT(elm, field) ((elm)->field.teq_next)
#define TAILQ_INIT(head) { \
(head)->tqh_first = NULL; \
(head)->tqh_last = &(head)->tqh_first; \