/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

/* $Id: ondestroy.c,v 1.16 2007/06/19 23:47:17 tbox Exp $ */

/*! \file */

#include <config.h>

#include <stddef.h>

#include <isc/event.h>
#include <isc/magic.h>
#include <isc/ondestroy.h>
#include <isc/task.h>
#include <isc/util.h>

#define ONDESTROY_MAGIC		ISC_MAGIC('D', 'e', 'S', 't')
#define VALID_ONDESTROY(s)	ISC_MAGIC_VALID(s, ONDESTROY_MAGIC)

void
isc_ondestroy_init(isc_ondestroy_t *ondest) {
	ondest->magic = ONDESTROY_MAGIC;
	ISC_LIST_INIT(ondest->events);
}

isc_result_t
isc_ondestroy_register(isc_ondestroy_t *ondest, isc_task_t *task,
		       isc_event_t **eventp)
{
	isc_event_t *theevent;
	isc_task_t *thetask = NULL;

	REQUIRE(VALID_ONDESTROY(ondest));
	REQUIRE(task != NULL);
	REQUIRE(eventp != NULL);
	REQUIRE((*eventp) != NULL);

	theevent = *eventp;

	isc_task_attach(task, &thetask);

	theevent->ev_sender = thetask;

	ISC_LIST_APPEND(ondest->events, theevent, ev_link);

	return (ISC_R_SUCCESS);
}

void
isc_ondestroy_notify(isc_ondestroy_t *ondest, void *sender) {
	isc_event_t *eventp;
	isc_task_t *task;

	REQUIRE(VALID_ONDESTROY(ondest));

	eventp = ISC_LIST_HEAD(ondest->events);
	while (eventp != NULL) {
		ISC_LIST_UNLINK(ondest->events, eventp, ev_link);

		task = eventp->ev_sender;
		eventp->ev_sender = sender;

		isc_task_sendanddetach(&task, &eventp);

		eventp = ISC_LIST_HEAD(ondest->events);
	}
}