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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"
#define TEVENT_DEPRECATED 1
#include "tevent.h"
#include "tevent_internal.h"
#include "tevent_util.h"
static void tevent_common_immediate_cancel(struct tevent_immediate *im)
{
const char *create_location = im->create_location;
bool busy = im->busy;
uint64_t tag = im->tag;
struct tevent_context *detach_ev_ctx = NULL;
if (im->destroyed) {
tevent_abort(im->event_ctx, "tevent_immediate use after free");
return;
}
if (im->detach_ev_ctx != NULL) {
detach_ev_ctx = im->detach_ev_ctx;
im->detach_ev_ctx = NULL;
tevent_trace_immediate_callback(detach_ev_ctx,
im,
TEVENT_EVENT_TRACE_DETACH);
return;
}
if (!im->event_ctx) {
return;
}
if (im->handler_name != NULL) {
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);
}
if (busy && im->handler_name == NULL) {
detach_ev_ctx = im->event_ctx;
} else {
tevent_trace_immediate_callback(im->event_ctx,
im,
TEVENT_EVENT_TRACE_DETACH);
}
DLIST_REMOVE(im->event_ctx->immediate_events, im);
*im = (struct tevent_immediate) {
.create_location = create_location,
.busy = busy,
.tag = tag,
.detach_ev_ctx = detach_ev_ctx,
};
if (!busy) {
talloc_set_destructor(im, NULL);
}
}
/*
destroy an immediate event
*/
static int tevent_common_immediate_destructor(struct tevent_immediate *im)
{
if (im->destroyed) {
tevent_common_check_double_free(im,
"tevent_immediate double free");
goto done;
}
tevent_common_immediate_cancel(im);
im->destroyed = true;
done:
if (im->busy) {
return -1;
}
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)
{
const char *create_location = im->create_location;
bool busy = im->busy;
uint64_t tag = im->tag;
struct tevent_wrapper_glue *glue = im->wrapper;
tevent_common_immediate_cancel(im);
if (!handler) {
return;
}
*im = (struct tevent_immediate) {
.event_ctx = ev,
.wrapper = glue,
.handler = handler,
.private_data = private_data,
.handler_name = handler_name,
.create_location = create_location,
.schedule_location = location,
.busy = busy,
.tag = tag,
};
tevent_trace_immediate_callback(im->event_ctx, im, TEVENT_EVENT_TRACE_ATTACH);
DLIST_ADD_END(ev->immediate_events, im);
talloc_set_destructor(im, tevent_common_immediate_destructor);
tevent_debug(ev, TEVENT_DEBUG_TRACE,
"Schedule immediate event \"%s\": %p\n",
handler_name, im);
}
int tevent_common_invoke_immediate_handler(struct tevent_immediate *im,
bool *removed)
{
struct tevent_context *handler_ev = im->event_ctx;
struct tevent_context *ev = im->event_ctx;
struct tevent_immediate cur = *im;
if (removed != NULL) {
*removed = 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
*/
im->busy = true;
im->handler_name = NULL;
tevent_common_immediate_cancel(im);
if (cur.wrapper != NULL) {
handler_ev = cur.wrapper->wrap_ev;
tevent_wrapper_push_use_internal(handler_ev, cur.wrapper);
cur.wrapper->ops->before_immediate_handler(
cur.wrapper->wrap_ev,
cur.wrapper->private_state,
cur.wrapper->main_ev,
im,
cur.handler_name,
cur.schedule_location);
}
tevent_trace_immediate_callback(cur.event_ctx, im, TEVENT_EVENT_TRACE_BEFORE_HANDLER);
cur.handler(handler_ev, im, cur.private_data);
if (cur.wrapper != NULL) {
cur.wrapper->ops->after_immediate_handler(
cur.wrapper->wrap_ev,
cur.wrapper->private_state,
cur.wrapper->main_ev,
im,
cur.handler_name,
cur.schedule_location);
tevent_wrapper_pop_use_internal(handler_ev, cur.wrapper);
}
im->busy = false;
/* The event was removed in tevent_common_immediate_cancel(). */
if (im->detach_ev_ctx != NULL) {
struct tevent_context *detach_ev_ctx = im->detach_ev_ctx;
im->detach_ev_ctx = NULL;
tevent_trace_immediate_callback(detach_ev_ctx,
im,
TEVENT_EVENT_TRACE_DETACH);
}
if (im->destroyed) {
talloc_set_destructor(im, NULL);
TALLOC_FREE(im);
if (removed != NULL) {
*removed = true;
}
}
return 0;
}
/*
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;
int ret;
if (!im) {
return false;
}
ret = tevent_common_invoke_immediate_handler(im, NULL);
if (ret != 0) {
tevent_abort(ev, "tevent_common_invoke_immediate_handler() failed");
}
return true;
}
void tevent_immediate_set_tag(struct tevent_immediate *im, uint64_t tag)
{
if (im == NULL) {
return;
}
im->tag = tag;
}
uint64_t tevent_immediate_get_tag(const struct tevent_immediate *im)
{
if (im == NULL) {
return 0;
}
return im->tag;
}
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