/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef	_FMD_EVENTQ_H
#define	_FMD_EVENTQ_H

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <pthread.h>

#ifdef	__cplusplus
extern "C" {
#endif

#include <fmd_event.h>
#include <fmd_list.h>

typedef struct fmd_eventqstat {
	fmd_stat_t eqs_dispatched;	/* total events dispatched to queue */
	fmd_stat_t eqs_dequeued;	/* total events dequeued by consumer */
	fmd_stat_t eqs_prdequeued;	/* total protocol events dequeued */
	fmd_stat_t eqs_dropped;		/* total events dropped by queue */
	fmd_stat_t eqs_wcnt;		/* count of events waiting on queue */
	fmd_stat_t eqs_wtime;		/* total wait time (pre-dispatch) */
	fmd_stat_t eqs_wlentime;	/* total wait length * time product */
	fmd_stat_t eqs_wlastupdate;	/* hrtime of last wait queue update */
	fmd_stat_t eqs_dtime;		/* total dispatch time */
	fmd_stat_t eqs_dlastupdate;	/* hrtime of last dispatch */
} fmd_eventqstat_t;

typedef struct fmd_eventqelem {
	fmd_list_t eqe_list;		/* linked-list prev/next pointers */
	fmd_event_t *eqe_event;		/* pointer to event */
} fmd_eventqelem_t;

struct fmd_module;			/* see <fmd_module.h> */

typedef struct fmd_eventq {
	pthread_mutex_t eq_lock;	/* lock protecting queue contents */
	pthread_cond_t eq_cv;		/* condition variable for waiters */
	fmd_list_t eq_list;		/* list head/tail pointers for queue */
	struct fmd_module *eq_mod;	/* module associated with this queue */
	pthread_mutex_t *eq_stats_lock;	/* lock that protects eq_stats */
	fmd_eventqstat_t *eq_stats;	/* statistics associated with queue */
	uint_t eq_limit;		/* limit on number of queue elements */
	uint_t eq_size;			/* number of elements on queue */
	uint_t eq_flags;		/* flags for abort and suspend */
	id_t eq_sgid;			/* subscription group id for dispq */
} fmd_eventq_t;

#define	FMD_EVENTQ_ABORT	0x1	/* return NULL from fmd_eventq_delete */
#define	FMD_EVENTQ_SUSPEND	0x2	/* suspend in fmd_eventq_delete */

extern fmd_eventq_t *fmd_eventq_create(struct fmd_module *,
    fmd_eventqstat_t *, pthread_mutex_t *, uint_t);
extern void fmd_eventq_destroy(fmd_eventq_t *);
extern void fmd_eventq_insert_at_head(fmd_eventq_t *, fmd_event_t *);
extern void fmd_eventq_insert_at_time(fmd_eventq_t *, fmd_event_t *);
extern fmd_event_t *fmd_eventq_delete(fmd_eventq_t *);
extern void fmd_eventq_done(fmd_eventq_t *);
extern void fmd_eventq_cancel(fmd_eventq_t *, uint_t, void *);
extern void fmd_eventq_suspend(fmd_eventq_t *);
extern void fmd_eventq_resume(fmd_eventq_t *);
extern void fmd_eventq_abort(fmd_eventq_t *);

#ifdef	__cplusplus
}
#endif

#endif	/* _FMD_EVENTQ_H */