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/***
This file is part of avahi.
avahi is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
avahi 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 Lesser General
Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with avahi; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdlib.h>
#include <avahi-common/timeval.h>
#include <avahi-common/malloc.h>
#include "timeeventq.h"
#include "log.h"
struct AvahiTimeEvent {
AvahiTimeEventQueue *queue;
AvahiPrioQueueNode *node;
struct timeval expiry;
struct timeval last_run;
AvahiTimeEventCallback callback;
void* userdata;
};
struct AvahiTimeEventQueue {
const AvahiPoll *poll_api;
AvahiPrioQueue *prioq;
AvahiTimeout *timeout;
};
static int compare(const void* _a, const void* _b) {
const AvahiTimeEvent *a = _a, *b = _b;
int ret;
if ((ret = avahi_timeval_compare(&a->expiry, &b->expiry)) != 0)
return ret;
/* If both exevents are scheduled for the same time, put the entry
* that has been run earlier the last time first. */
return avahi_timeval_compare(&a->last_run, &b->last_run);
}
static AvahiTimeEvent* time_event_queue_root(AvahiTimeEventQueue *q) {
assert(q);
return q->prioq->root ? q->prioq->root->data : NULL;
}
static void update_timeout(AvahiTimeEventQueue *q) {
AvahiTimeEvent *e;
assert(q);
if ((e = time_event_queue_root(q)))
q->poll_api->timeout_update(q->timeout, &e->expiry);
else
q->poll_api->timeout_update(q->timeout, NULL);
}
static void expiration_event(AVAHI_GCC_UNUSED AvahiTimeout *timeout, void *userdata) {
AvahiTimeEventQueue *q = userdata;
AvahiTimeEvent *e;
if ((e = time_event_queue_root(q))) {
struct timeval now;
gettimeofday(&now, NULL);
/* Check if expired */
if (avahi_timeval_compare(&now, &e->expiry) >= 0) {
/* Make sure to move the entry away from the front */
e->last_run = now;
avahi_prio_queue_shuffle(q->prioq, e->node);
/* Run it */
assert(e->callback);
e->callback(e, e->userdata);
update_timeout(q);
return;
}
}
avahi_log_debug(__FILE__": Strange, expiration_event() called, but nothing really happened.");
update_timeout(q);
}
static void fix_expiry_time(AvahiTimeEvent *e) {
struct timeval now;
assert(e);
return; /*** DO WE REALLY NEED THIS? ***/
gettimeofday(&now, NULL);
if (avahi_timeval_compare(&now, &e->expiry) > 0)
e->expiry = now;
}
AvahiTimeEventQueue* avahi_time_event_queue_new(const AvahiPoll *poll_api) {
AvahiTimeEventQueue *q;
if (!(q = avahi_new(AvahiTimeEventQueue, 1))) {
avahi_log_error(__FILE__": Out of memory");
goto oom;
}
q->poll_api = poll_api;
if (!(q->prioq = avahi_prio_queue_new(compare)))
goto oom;
if (!(q->timeout = poll_api->timeout_new(poll_api, NULL, expiration_event, q)))
goto oom;
return q;
oom:
if (q) {
avahi_free(q);
if (q->prioq)
avahi_prio_queue_free(q->prioq);
}
return NULL;
}
void avahi_time_event_queue_free(AvahiTimeEventQueue *q) {
AvahiTimeEvent *e;
assert(q);
while ((e = time_event_queue_root(q)))
avahi_time_event_free(e);
avahi_prio_queue_free(q->prioq);
q->poll_api->timeout_free(q->timeout);
avahi_free(q);
}
AvahiTimeEvent* avahi_time_event_new(
AvahiTimeEventQueue *q,
const struct timeval *timeval,
AvahiTimeEventCallback callback,
void* userdata) {
AvahiTimeEvent *e;
assert(q);
assert(callback);
assert(userdata);
if (!(e = avahi_new(AvahiTimeEvent, 1))) {
avahi_log_error(__FILE__": Out of memory");
return NULL; /* OOM */
}
e->queue = q;
e->callback = callback;
e->userdata = userdata;
if (timeval)
e->expiry = *timeval;
else {
e->expiry.tv_sec = 0;
e->expiry.tv_usec = 0;
}
fix_expiry_time(e);
e->last_run.tv_sec = 0;
e->last_run.tv_usec = 0;
if (!(e->node = avahi_prio_queue_put(q->prioq, e))) {
avahi_free(e);
return NULL;
}
update_timeout(q);
return e;
}
void avahi_time_event_free(AvahiTimeEvent *e) {
AvahiTimeEventQueue *q;
assert(e);
q = e->queue;
avahi_prio_queue_remove(q->prioq, e->node);
avahi_free(e);
update_timeout(q);
}
void avahi_time_event_update(AvahiTimeEvent *e, const struct timeval *timeval) {
assert(e);
assert(timeval);
e->expiry = *timeval;
fix_expiry_time(e);
avahi_prio_queue_shuffle(e->queue->prioq, e->node);
update_timeout(e->queue);
}
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