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/*
Unix SMB/CIFS implementation.
common events code for immediate events
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"
static void tevent_common_immediate_cancel(struct tevent_immediate *im)
{
if (!im->event_ctx) {
return;
}
tevent_debug(im->event_ctx, TEVENT_DEBUG_TRACE,
"Cancel immediate event %p \"%s\"\n",
im, im->handler_name);
/* let the backend free im->additional_data */
if (im->cancel_fn) {
im->cancel_fn(im);
}
DLIST_REMOVE(im->event_ctx->immediate_events, im);
im->event_ctx = NULL;
im->handler = NULL;
im->private_data = NULL;
im->handler_name = NULL;
im->schedule_location = NULL;
im->cancel_fn = NULL;
im->additional_data = NULL;
talloc_set_destructor(im, NULL);
}
/*
destroy an immediate event
*/
static int tevent_common_immediate_destructor(struct tevent_immediate *im)
{
tevent_common_immediate_cancel(im);
return 0;
}
/*
* schedule an immediate event on
*/
void tevent_common_schedule_immediate(struct tevent_immediate *im,
struct tevent_context *ev,
tevent_immediate_handler_t handler,
void *private_data,
const char *handler_name,
const char *location)
{
tevent_common_immediate_cancel(im);
if (!handler) {
return;
}
im->event_ctx = ev;
im->handler = handler;
im->private_data = private_data;
im->handler_name = handler_name;
im->schedule_location = location;
im->cancel_fn = NULL;
im->additional_data = NULL;
DLIST_ADD_END(ev->immediate_events, im, struct tevent_immediate *);
talloc_set_destructor(im, tevent_common_immediate_destructor);
tevent_debug(ev, TEVENT_DEBUG_TRACE,
"Schedule immediate event \"%s\": %p\n",
handler_name, im);
}
/*
trigger the first immediate event and return true
if no event was triggered return false
*/
bool tevent_common_loop_immediate(struct tevent_context *ev)
{
struct tevent_immediate *im = ev->immediate_events;
tevent_immediate_handler_t handler;
void *private_data;
if (!im) {
return false;
}
tevent_debug(ev, TEVENT_DEBUG_TRACE,
"Run immediate event \"%s\": %p\n",
im->handler_name, im);
/*
* remember the handler and then clear the event
* the handler might reschedule the event
*/
handler = im->handler;
private_data = im->private_data;
DLIST_REMOVE(im->event_ctx->immediate_events, im);
im->event_ctx = NULL;
im->handler = NULL;
im->private_data = NULL;
im->handler_name = NULL;
im->schedule_location = NULL;
im->cancel_fn = NULL;
im->additional_data = NULL;
talloc_set_destructor(im, NULL);
handler(ev, im, private_data);
return true;
}
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