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/*

 * Copyright 2008 Vincent Sanders 

 *

 * This file is part of NetSurf, http://www.netsurf-browser.org/

 *

 * NetSurf is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License.

 *

 * NetSurf is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see .

 */

#include 

#include 

#include 

#include "utils/schedule.h"

#include "framebuffer/schedule.h"

#include "utils/log.h"

/* linked list of scheduled callbacks */

static struct nscallback *schedule_list = NULL;

/**

 * scheduled callback.

 */

struct nscallback

{

        struct nscallback *next;

	struct timeval tv;

	void (*callback)(void *p);

	void *p;

};

/**

 * Schedule a callback.

 *

 * \param  tival     interval before the callback should be made / cs

 * \param  callback  callback function

 * \param  p         user parameter, passed to callback function

 *

 * The callback function will be called as soon as possible after t cs have

 * passed.

 */

void schedule(int cs_ival, void (*callback)(void *p), void *p)

{

	struct nscallback *nscb;

	struct timeval tv;

        tv.tv_sec = cs_ival / 100; /* cs to seconds */

        tv.tv_usec = (cs_ival % 100) * 10000; /* remainder to microseconds */

	nscb = calloc(1, sizeof(struct nscallback));

	gettimeofday(&nscb->tv, NULL);

	timeradd(&nscb->tv, &tv, &nscb->tv);

	nscb->callback = callback;

	nscb->p = p;

        /* add to list front */

        nscb->next = schedule_list;

        schedule_list = nscb;

}

/**

 * Unschedule a callback.

 *

 * \param  callback  callback function

 * \param  p         user parameter, passed to callback function

 *

 * All scheduled callbacks matching both callback and p are removed.

 */

void schedule_remove(void (*callback)(void *p), void *p)

{

        struct nscallback *cur_nscb;

        struct nscallback *prev_nscb;

        struct nscallback *unlnk_nscb;

        if (schedule_list == NULL)

                return;

	LOG(("removing %p, %p", callback, p));

        cur_nscb = schedule_list;

        prev_nscb = NULL;

        while (cur_nscb != NULL) {

                if ((cur_nscb->callback ==  callback) &&

                    (cur_nscb->p ==  p)) {

                        /* item to remove */

                        LOG(("callback entry %p removing  %p(%p)",

                             cur_nscb, cur_nscb->callback, cur_nscb->p));

                        /* remove callback */

                        unlnk_nscb = cur_nscb;

                        cur_nscb = unlnk_nscb->next;

                        if (prev_nscb == NULL) {

                                schedule_list = cur_nscb;

                        } else {

                                prev_nscb->next = cur_nscb;

                        }

                        free (unlnk_nscb);

                } else {

                        /* move to next element */

                        prev_nscb = cur_nscb;

                        cur_nscb = prev_nscb->next;

                }

        }

}

/**

 * Process scheduled callbacks up to current time.

 *

 * @return The number of milliseconds untill the next scheduled event

 * or -1 for no event.

 */

int

schedule_run(void)

{

	struct timeval tv;

	struct timeval nexttime;

	struct timeval rettime;

        struct nscallback *cur_nscb;

        struct nscallback *prev_nscb;

        struct nscallback *unlnk_nscb;

        if (schedule_list == NULL)

                return -1;

	/* reset enumeration to the start of the list */

        cur_nscb = schedule_list;

        prev_nscb = NULL;

	nexttime = cur_nscb->tv;

	gettimeofday(&tv, NULL);

        while (cur_nscb != NULL) {

                if (timercmp(&tv, &cur_nscb->tv, 0)) {

                        /* scheduled time */

                        /* remove callback */

                        unlnk_nscb = cur_nscb;

                        if (prev_nscb == NULL) {

                                schedule_list = unlnk_nscb->next;

                        } else {

                                prev_nscb->next = unlnk_nscb->next;

                        }

                        unlnk_nscb->callback(unlnk_nscb->p);

                        free(unlnk_nscb);

                        /* need to deal with callback modifying the list. */

			if (schedule_list == NULL)

				return -1; /* no more callbacks scheduled */

                        /* reset enumeration to the start of the list */

                        cur_nscb = schedule_list;

                        prev_nscb = NULL;

			nexttime = cur_nscb->tv;

                } else {

			/* if the time to the event is sooner than the

			 * currently recorded soonest event record it

			 */

			if (timercmp(&nexttime, &cur_nscb->tv, 0)) {

				nexttime = cur_nscb->tv;

			}

                        /* move to next element */

                        prev_nscb = cur_nscb;

                        cur_nscb = prev_nscb->next;

                }

        }

	/* make rettime relative to now */

	timersub(&nexttime, &tv, &rettime);

	/*LOG(("returning time to next event as %ldms",(rettime.tv_sec * 1000) + (rettime.tv_usec / 1000))); */

	/* return next event time in milliseconds (24days max wait) */

        return (rettime.tv_sec * 1000) + (rettime.tv_usec / 1000);

}

void list_schedule(void)

{

	struct timeval tv;

        struct nscallback *cur_nscb;

	gettimeofday(&tv, NULL);

        LOG(("schedule list at %ld:%ld", tv.tv_sec, tv.tv_usec));

        cur_nscb = schedule_list;

        while (cur_nscb != NULL) {

                LOG(("Schedule %p at %ld:%ld",

                     cur_nscb, cur_nscb->tv.tv_sec, cur_nscb->tv.tv_usec));

                cur_nscb = cur_nscb->next;

        }

}

/*

 * Local Variables:

 * c-basic-offset:8

 * End:

 */