summaryrefslogtreecommitdiff
path: root/frontends/atari/schedule.c
diff options
context:
space:
mode:
Diffstat (limited to 'frontends/atari/schedule.c')
-rw-r--r--frontends/atari/schedule.c228
1 files changed, 228 insertions, 0 deletions
diff --git a/frontends/atari/schedule.c b/frontends/atari/schedule.c
new file mode 100644
index 000000000..48980426d
--- /dev/null
+++ b/frontends/atari/schedule.c
@@ -0,0 +1,228 @@
+/*
+ * Copyright 2008 Vincent Sanders <vince@simtec.co.uk>
+ * Copyright 2011 Ole Loots <ole@monochrom.net>
+ *
+ * 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/>.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include "utils/sys_time.h"
+#include "utils/errors.h"
+
+#include "atari/schedule.h"
+
+#ifdef DEBUG_SCHEDULER
+#include "utils/log.h"
+#else
+#define LOG(x...)
+#endif
+
+#define MS_NOW() ((clock() * 1000) / CLOCKS_PER_SEC)
+
+/* linked list of scheduled callbacks */
+static struct nscallback *schedule_list = NULL;
+
+/**
+ * scheduled callback.
+ */
+struct nscallback
+{
+ struct nscallback *next;
+ unsigned long timeout;
+ void (*callback)(void *p);
+ void *p;
+};
+
+static int max_scheduled;
+static int cur_scheduled;
+
+/**
+ * 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;
+ }
+
+ 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);
+ cur_scheduled--;
+ } else {
+ /* move to next element */
+ prev_nscb = cur_nscb;
+ cur_nscb = prev_nscb->next;
+ }
+ }
+ return NSERROR_OK;
+}
+
+/* exported function documented in atari/schedule.h */
+nserror atari_schedule(int ival, void (*callback)(void *p), void *p)
+{
+ struct nscallback *nscb;
+ nserror ret;
+
+ /* remove any existing callback of this kind */
+ ret = schedule_remove(callback, p);
+ if ((ival < 0) || (ret != NSERROR_OK)) {
+ return ret;
+ }
+
+ nscb = calloc(1, sizeof(struct nscallback));
+
+ nscb->timeout = MS_NOW() + ival;
+
+ LOG("adding callback %p for %p(%p) at %d ms", nscb, callback, p, nscb->timeout);
+
+ nscb->callback = callback;
+ nscb->p = p;
+
+ /* add to list front */
+ nscb->next = schedule_list;
+ schedule_list = nscb;
+ cur_scheduled++;
+ if( cur_scheduled > max_scheduled ) {
+ max_scheduled = cur_scheduled;
+ }
+
+ return NSERROR_OK;
+}
+
+
+/* exported function documented in atari/schedule.h */
+int schedule_run(void)
+{
+ unsigned long nexttime;
+ struct nscallback *cur_nscb;
+ struct nscallback *prev_nscb;
+ struct nscallback *unlnk_nscb;
+ unsigned long now = MS_NOW();
+
+ if (schedule_list == NULL)
+ return -1;
+
+ /* reset enumeration to the start of the list */
+ cur_nscb = schedule_list;
+ prev_nscb = NULL;
+ nexttime = cur_nscb->timeout;
+
+ while (cur_nscb != NULL) {
+ if (now > cur_nscb->timeout) {
+ /* scheduled time */
+
+ /* remove callback */
+ unlnk_nscb = cur_nscb;
+ if (prev_nscb == NULL) {
+ schedule_list = unlnk_nscb->next;
+ } else {
+ prev_nscb->next = unlnk_nscb->next;
+ }
+
+ LOG("callback entry %p running %p(%p)", unlnk_nscb, unlnk_nscb->callback, unlnk_nscb->p);
+
+ /* call callback */
+ unlnk_nscb->callback(unlnk_nscb->p);
+ free(unlnk_nscb);
+ cur_scheduled--;
+
+ /* need to deal with callback modifying the list. */
+ if (schedule_list == NULL) {
+ LOG("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->timeout;
+ } else {
+ /* if the time to the event is sooner than the
+ * currently recorded soonest event record it
+ */
+ if (nexttime > cur_nscb->timeout) {
+ nexttime = cur_nscb->timeout;
+ }
+ /* move to next element */
+ prev_nscb = cur_nscb;
+ cur_nscb = prev_nscb->next;
+ }
+ }
+
+ /* make rettime relative to now and convert to ms */
+ nexttime = nexttime - now;
+
+ LOG("returning time to next event as %ldms", nexttime);
+
+ /*return next event time in milliseconds (24days max wait) */
+ return nexttime;
+}
+
+
+/* exported function documented in atari/schedule.h */
+void list_schedule(void)
+{
+ struct nscallback *cur_nscb;
+
+ LOG("schedule list at ms clock %ld", MS_NOW());
+
+ cur_nscb = schedule_list;
+ while (cur_nscb != NULL) {
+ LOG("Schedule %p at %ld", cur_nscb, cur_nscb->timeout);
+ cur_nscb = cur_nscb->next;
+ }
+ LOG("Maxmium callbacks scheduled: %d", max_scheduled);
+}
+
+
+/*
+ * Local Variables:
+ * c-basic-offset:8
+ * End:
+ */