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dlg_timer.c
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dlg_timer.c
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/*
* $Id$
*
* Copyright (C) 2006 Voice System SRL
*
* This file is part of Kamailio, a free SIP server.
*
* Kamailio 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; either version 2 of the License, or
* (at your option) any later version
*
* Kamailio 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* History:
* --------
* 2006-04-14 initial version (bogdan)
* 2007-03-06 to avoid races, tests on timer links are done under locks
* (bogdan)
*/
/*!
* \file
* \brief Timer related functions for the dialog module
* \ingroup dialog
* Module: \ref dialog
*/
#include "../../core/mem/shm_mem.h"
#include "../../core/timer.h"
#include "dlg_timer.h"
/*! global dialog timer */
struct dlg_timer *d_timer = 0;
/*! global dialog timer handler */
dlg_timer_handler timer_hdl = 0;
/*!
* \brief Initialize the dialog timer handler
* Initialize the dialog timer handler, allocate the lock and a global
* timer in shared memory. The global timer handler will be set on success.
* \param hdl dialog timer handler
* \return 0 on success, -1 on failure
*/
int init_dlg_timer(dlg_timer_handler hdl)
{
d_timer = (struct dlg_timer *)shm_malloc(sizeof(struct dlg_timer));
if(d_timer == 0) {
LM_ERR("no more shm mem\n");
return -1;
}
memset(d_timer, 0, sizeof(struct dlg_timer));
d_timer->first.next = d_timer->first.prev = &(d_timer->first);
d_timer->lock = lock_alloc();
if(d_timer->lock == 0) {
LM_ERR("failed to alloc lock\n");
goto error0;
}
if(lock_init(d_timer->lock) == 0) {
LM_ERR("failed to init lock\n");
goto error1;
}
timer_hdl = hdl;
return 0;
error1:
lock_dealloc(d_timer->lock);
error0:
shm_free(d_timer);
d_timer = 0;
return -1;
}
/*!
* \brief Destroy global dialog timer
*/
void destroy_dlg_timer(void)
{
if(d_timer == 0)
return;
lock_destroy(d_timer->lock);
lock_dealloc(d_timer->lock);
shm_free(d_timer);
d_timer = 0;
}
/*!
* \brief Helper function for insert_dialog_timer
* \see insert_dialog_timer
* \param tl dialog timer list
*/
static inline void insert_dialog_timer_unsafe(struct dlg_tl *tl)
{
struct dlg_tl *ptr;
/* insert in sorted order */
for(ptr = d_timer->first.prev; ptr != &d_timer->first; ptr = ptr->prev) {
if(ptr->timeout <= tl->timeout)
break;
}
LM_DBG("inserting %p for %d\n", tl, tl->timeout);
tl->prev = ptr;
tl->next = ptr->next;
tl->prev->next = tl;
tl->next->prev = tl;
}
/*!
* \brief Insert a dialog timer to the list
* \param tl dialog timer list
* \param interval timeout value in seconds
* \return 0 on success, -1 when the input timer list is invalid
*/
int insert_dlg_timer(struct dlg_tl *tl, int interval)
{
lock_get(d_timer->lock);
if(tl->next != 0 || tl->prev != 0) {
LM_CRIT("Trying to insert a bogus dlg tl=%p tl->next=%p tl->prev=%p\n",
tl, tl->next, tl->prev);
lock_release(d_timer->lock);
return -1;
}
tl->timeout = get_ticks() + interval;
insert_dialog_timer_unsafe(tl);
lock_release(d_timer->lock);
return 0;
}
/*!
* \brief Helper function for remove_dialog_timer
* \param tl dialog timer list
* \see remove_dialog_timer
*/
static inline void remove_dialog_timer_unsafe(struct dlg_tl *tl)
{
tl->prev->next = tl->next;
tl->next->prev = tl->prev;
}
/*!
* \brief Remove a dialog timer from the list
* \param tl dialog timer that should be removed
* \return 1 when the input timer is empty, 0 when the timer was removed,
* -1 when the input timer list is invalid
*/
int remove_dialog_timer(struct dlg_tl *tl)
{
lock_get(d_timer->lock);
if(tl->prev == NULL && tl->timeout == 0) {
lock_release(d_timer->lock);
return 1;
}
if(tl->prev == NULL || tl->next == NULL) {
LM_CRIT("bogus tl=%p tl->prev=%p tl->next=%p\n", tl, tl->prev,
tl->next);
lock_release(d_timer->lock);
return -1;
}
remove_dialog_timer_unsafe(tl);
tl->next = NULL;
tl->prev = NULL;
tl->timeout = 0;
lock_release(d_timer->lock);
return 0;
}
/*!
* \brief Update a dialog timer on the list
* \param tl dialog timer
* \param timeout new timeout value in seconds
* \return 0 on success, -1 when the input list is invalid
* \note the update is implemented as a remove, insert
*/
int update_dlg_timer(struct dlg_tl *tl, int timeout)
{
lock_get(d_timer->lock);
if(tl->next == 0 || tl->prev == 0) {
LM_CRIT("Trying to update a bogus dlg tl=%p tl->next=%p tl->prev=%p\n",
tl, tl->next, tl->prev);
lock_release(d_timer->lock);
return -1;
}
remove_dialog_timer_unsafe(tl);
tl->timeout = get_ticks() + timeout;
insert_dialog_timer_unsafe(tl);
lock_release(d_timer->lock);
return 0;
}
/*!
* \brief Helper function for dlg_timer_routine
* \param time time for expiration check
* \return list of expired dialogs on success, 0 on failure
*/
static inline struct dlg_tl *get_expired_dlgs(unsigned int time)
{
struct dlg_tl *tl, *end, *ret;
lock_get(d_timer->lock);
if(d_timer->first.next == &(d_timer->first)
|| d_timer->first.next->timeout > time) {
lock_release(d_timer->lock);
return 0;
}
end = &d_timer->first;
tl = d_timer->first.next;
LM_DBG("start with tl=%p tl->prev=%p tl->next=%p (%d) at %d "
"and end with end=%p end->prev=%p end->next=%p\n",
tl, tl->prev, tl->next, tl->timeout, time, end, end->prev,
end->next);
while(tl != end && tl->timeout <= time) {
LM_DBG("getting tl=%p tl->prev=%p tl->next=%p with %d\n", tl, tl->prev,
tl->next, tl->timeout);
tl->prev = 0;
tl->timeout = 0;
tl = tl->next;
}
LM_DBG("end with tl=%p tl->prev=%p tl->next=%p and "
"d_timer->first.next->prev=%p\n",
tl, tl->prev, tl->next, d_timer->first.next->prev);
if(tl == end && d_timer->first.next->prev) {
ret = 0;
} else {
ret = d_timer->first.next;
tl->prev->next = 0;
d_timer->first.next = tl;
tl->prev = &d_timer->first;
}
lock_release(d_timer->lock);
return ret;
}
/*!
* \brief Timer routine for expiration of dialogs
* Timer handler for expiration of dialogs, runs the global timer handler on them.
* \param ticks for expiration checks
* \param attr unused
*/
void dlg_timer_routine(unsigned int ticks, void *attr)
{
struct dlg_tl *tl, *ctl;
tl = get_expired_dlgs(ticks);
while(tl) {
ctl = tl;
tl = tl->next;
ctl->next = NULL;
LM_DBG("tl=%p next=%p\n", ctl, tl);
timer_hdl(ctl);
}
}