/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 1999 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _GHD_QUEUE_H
#define _GHD_QUEUE_H

#ifdef  __cplusplus
extern "C" {
#endif


/*
 *  A list of singly linked elements
 */

typedef struct L1el {
        struct L1el     *le_nextp;
        void            *le_datap;
} L1el_t;

#define L1EL_INIT(lep)  ((lep)->le_nextp = NULL, (lep)->le_datap = 0)

typedef struct L1_head {
        L1el_t  *l1_headp;
        L1el_t  *l1_tailp;
} L1_t;

#define L1HEADER_INIT(lp) (((lp)->l1_headp = NULL), ((lp)->l1_tailp = NULL))
#define L1_EMPTY(lp)    ((lp)->l1_headp == NULL)

void     L1_add(L1_t *lp, L1el_t *lep, void *datap);
void     L1_delete(L1_t *lp, L1el_t *lep);
void    *L1_remove(L1_t *lp);


/*
 * A list of doubly linked elements
 */

typedef struct L2el {
        struct  L2el    *l2_nextp;
        struct  L2el    *l2_prevp;
        void            *l2_private;
} L2el_t;

#define L2_INIT(headp)  \
        (((headp)->l2_nextp = (headp)), ((headp)->l2_prevp = (headp)))

#define L2_EMPTY(headp) ((headp)->l2_nextp == (headp))

void    L2_add(L2el_t *headp, L2el_t *elementp, void *private);
void    L2_delete(L2el_t *elementp);
void    L2_add_head(L2el_t *headp, L2el_t *elementp, void *private);
void    *L2_remove_head(L2el_t *headp);
void    *L2_next(L2el_t *elementp);


#ifdef  __cplusplus
}
#endif
#endif  /* _GHD_QUEUE_H */