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/*
Unix SMB/CIFS implementation.
Infrastructure for async requests
Copyright (C) Volker Lendecke 2008
Copyright (C) Stefan Metzmacher 2009
** NOTE! The following LGPL license applies to the tevent
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library 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 3 of the License, or (at your option) any later version.
This library 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 this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "tevent.h"
#include "tevent_internal.h"
#include "tevent_util.h"
struct tevent_queue_entry {
struct tevent_queue_entry *prev, *next;
struct tevent_queue *queue;
bool triggered;
struct tevent_req *req;
tevent_queue_trigger_fn_t trigger;
void *private_data;
};
struct tevent_queue {
const char *name;
const char *location;
bool running;
struct tevent_timer *timer;
size_t length;
struct tevent_queue_entry *list;
};
static int tevent_queue_entry_destructor(struct tevent_queue_entry *e)
{
struct tevent_queue *q = e->queue;
if (!q) {
return 0;
}
DLIST_REMOVE(q->list, e);
q->length--;
if (e->triggered &&
q->running &&
q->list) {
q->list->triggered = true;
q->list->trigger(q->list->req,
q->list->private_data);
}
return 0;
}
static int tevent_queue_destructor(struct tevent_queue *q)
{
q->running = false;
while (q->list) {
struct tevent_queue_entry *e = q->list;
talloc_free(e);
}
return 0;
}
struct tevent_queue *_tevent_queue_create(TALLOC_CTX *mem_ctx,
const char *name,
const char *location)
{
struct tevent_queue *queue;
queue = talloc_zero(mem_ctx, struct tevent_queue);
if (!queue) {
return NULL;
}
queue->name = talloc_strdup(queue, name);
if (!queue->name) {
talloc_free(queue);
return NULL;
}
queue->location = location;
/* queue is running by default */
queue->running = true;
talloc_set_destructor(queue, tevent_queue_destructor);
return queue;
}
static void tevent_queue_timer_start(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval now,
void *private_data)
{
struct tevent_queue *q = talloc_get_type(private_data,
struct tevent_queue);
talloc_free(te);
q->timer = NULL;
q->list->triggered = true;
q->list->trigger(q->list->req, q->list->private_data);
}
bool tevent_queue_add(struct tevent_queue *queue,
struct tevent_context *ev,
struct tevent_req *req,
tevent_queue_trigger_fn_t trigger,
void *private_data)
{
struct tevent_queue_entry *e;
e = talloc_zero(req, struct tevent_queue_entry);
if (e == NULL) {
return false;
}
e->queue = queue;
e->req = req;
e->trigger = trigger;
e->private_data = private_data;
if (queue->running &&
!queue->timer &&
!queue->list) {
queue->timer = tevent_add_timer(ev, queue, tevent_timeval_zero(),
tevent_queue_timer_start,
queue);
if (!queue->timer) {
talloc_free(e);
return false;
}
}
DLIST_ADD_END(queue->list, e, struct tevent_queue_entry *);
queue->length++;
talloc_set_destructor(e, tevent_queue_entry_destructor);
return true;
}
bool tevent_queue_start(struct tevent_queue *queue,
struct tevent_context *ev)
{
if (queue->running) {
/* already started */
return true;
}
if (!queue->timer &&
queue->list) {
queue->timer = tevent_add_timer(ev, queue, tevent_timeval_zero(),
tevent_queue_timer_start,
queue);
if (!queue->timer) {
return false;
}
}
queue->running = true;
return true;
}
void tevent_queue_stop(struct tevent_queue *queue)
{
queue->running = false;
talloc_free(queue->timer);
queue->timer = NULL;
}
size_t tevent_queue_length(struct tevent_queue *queue)
{
return queue->length;
}
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