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diff --git a/frontends/kolibrios/fb/schedule.c b/frontends/kolibrios/fb/schedule.c
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+/*
+ * Copyright 2008 Vincent Sanders <vince@simtec.co.uk>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+#ifndef _TARGET_IS_KOLIBRIOS
+#define _TARGET_IS_KOLIBRIOS
+#endif
+
+#ifdef _TARGET_IS_KOLIBRIOS
+
+
+#define timerclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
+#define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
+#define timercmp(tvp, uvp, cmp) \
+ (((tvp)->tv_sec == (uvp)->tv_sec) ? \
+ ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
+ ((tvp)->tv_sec cmp (uvp)->tv_sec))
+#define timeradd(tvp, uvp, vvp) \
+ do { \
+ (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
+ (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
+ if ((vvp)->tv_usec >= 1000000) { \
+ (vvp)->tv_sec++; \
+ (vvp)->tv_usec -= 1000000; \
+ } \
+ } while (0)
+#define timersub(tvp, uvp, vvp) \
+ do { \
+ (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
+ (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
+ if ((vvp)->tv_usec < 0) { \
+ (vvp)->tv_sec--; \
+ (vvp)->tv_usec += 1000000; \
+ } \
+ } while (0)
+
+#endif
+
+#include <time.h>
+#include <stdlib.h>
+
+#include "utils/sys_time.h"
+#include "utils/log.h"
+
+#include "framebuffer/schedule.h"
+
+#ifdef DEBUG_SCHEDULER
+#define SRLOG(x...) LOG(x)
+#else
+#define SRLOG(x...) ((void) 0)
+#endif
+
+/* 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;
+};
+
+/**
+ * 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.
+ */
+static nserror schedule_remove(void (*callback)(void *p), void *p)
+{
+ struct nscallback *cur_nscb;
+ struct nscallback *prev_nscb;
+ struct nscallback *unlnk_nscb;
+
+ /* check there is something on the list to remove */
+ if (schedule_list == NULL) {
+ return NSERROR_OK;
+ }
+
+ SRLOG("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 */
+
+ SRLOG("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;
+ }
+ }
+
+ return NSERROR_OK;
+}
+
+/* exported function documented in framebuffer/schedule.h */
+nserror framebuffer_schedule(int tival, void (*callback)(void *p), void *p)
+{
+ struct nscallback *nscb;
+ struct timeval tv;
+ nserror ret;
+
+ /* ensure uniqueness of the callback and context */
+ ret = schedule_remove(callback, p);
+ if ((tival < 0) || (ret != NSERROR_OK)) {
+ return ret;
+ }
+
+ SRLOG("Adding %p(%p) in %d", callback, p, tival);
+
+ tv.tv_sec = tival / 1000; /* miliseconds to seconds */
+ tv.tv_usec = (tival % 1000) * 1000; /* 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;
+
+ return NSERROR_OK;
+}
+
+/* exported function documented in framebuffer/schedule.h */
+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, >)) {
+ /* 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, >)) {
+ 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);
+
+ SRLOG("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:
+ */