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kamailio/modules/tm/timer.c

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/*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of ser, a free SIP server.
*
* ser 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
*
* For a license to use the ser software under conditions
* other than those described here, or to purchase support for this
* software, please contact iptel.org by e-mail at the following addresses:
* info@iptel.org
*
* ser 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* History:
* --------
* 2003-06-27 timers are not unlinked if timerlist is 0 (andrei)
* 2004-02-13 t->is_invite, t->local, t->noisy_ctimer replaced;
* timer_link.payload removed (bogdan)
* 2005-10-03 almost completely rewritten to use the new timers (andrei)
* 2005-12-12 on final response marked the rb as removed to avoid deleting
* it from the timer handle; timer_allow_del() (andrei)
* 2006-08-11 final_response_handler dns failover support for timeout-ed
* invites (andrei)
* 2006-09-28 removed the 480 on fr_inv_timeout reply: on timeout always
* return a 408
* set the corresponding "faked" failure route sip_msg->msg_flags
* on timeout or if the branch received a reply (andrei)
* 2007-03-15 TMCB_ONSEND callbacks support (andrei)
* 2007-05-29 delete on transaction ref_count==0 : removed the delete timer
* (andrei)
* 2007-06-01 support for different retransmissions intervals per transaction;
* added maximum inv. and non-inv. transaction life time (andrei)
*/
/**
* \file
* \brief TM :: timer support
*
* TM timer support. It has been designed for high performance using
* some techniques of which timer users need to be aware.
* - One technique is "fixed-timer-length". We maintain separate
* timer lists, all of them include elements of the same time
* to fire. That allows *appending* new events to the list as
* opposed to inserting them by time, which is costly due to
* searching time spent in a mutex. The performance benefit is
* noticeable. The limitation is you need a new timer list for
* each new timer length.
* - Another technique is the timer process slices off expired elements
* from the list in a mutex, but executes the timer after the mutex
* is left. That saves time greatly as whichever process wants to
* add/remove a timer, it does not have to wait until the current
* list is processed. However, be aware the timers may hit in a delayed
* manner; you have no guarantee in your process that after resetting a timer,
* it will no more hit. It might have been removed by timer process,
* and is waiting to be executed.
*
* The following example shows it:
*
* PROCESS1 TIMER PROCESS
*
* - 0. timer hits, it is removed from queue and
* about to be executed
* - 1. process1 decides to
* reset the timer
* - 2. timer is executed now
* - 3. if the process1 naively
* thinks the timer could not
* have been executed after
* resetting the timer, it is
* WRONG -- it was (step 2.)
*
* So be careful when writing the timer handlers. Currently defined timers
* don't hurt if they hit delayed, I hope at least. Retransmission timer
* may results in a useless retransmission -- not too bad. FR timer not too
* bad either as timer processing uses a REPLY mutex making it safe to other
* processing affecting transaction state. Wait timer not bad either -- processes
* putting a transaction on wait don't do anything with it anymore.
*
* Example when it does not hurt:
*
* PROCESS1 TIMER PROCESS
*
* - 0. RETR timer removed from list and
* scheduled for execution
* - 1. 200/BYE received->
* reset RETR, put_on_wait
* - 2. RETR timer executed -- too late but it does
* not hurt
* - 3. WAIT handler executed
*
* The rule of thumb is don't touch data you put under a timer. Create data,
* put them under a timer, and let them live until they are safely destroyed from
* wait/delete timer. The only safe place to manipulate the data is
* from timer process in which delayed timers cannot hit (all timers are
* processed sequentially).
*
* A "bad example" -- rewriting content of retransmission buffer
* in an unprotected way is bad because a delayed retransmission timer might
* hit. Thats why our reply retransmission procedure is enclosed in
* a REPLY_LOCK.
* \ingroup tm
*/
#include "defs.h"
#include "config.h"
#include "h_table.h"
#include "timer.h"
#include "../../dprint.h"
#include "lock.h"
#include "t_stats.h"
#include "../../hash_func.h"
#include "../../dprint.h"
#include "../../config.h"
#include "../../parser/parser_f.h"
#include "../../ut.h"
#include "../../timer_ticks.h"
#include "../../compiler_opt.h"
#include "../../sr_compat.h"
#include "t_funcs.h"
#include "t_reply.h"
#include "t_cancel.h"
#include "t_hooks.h"
#ifdef USE_DNS_FAILOVER
#include "t_fwd.h" /* t_send_branch */
#include "../../cfg_core.h" /* cfg_get(core, core_cfg, use_dns_failover) */
#endif
#ifdef USE_DST_BLACKLIST
#include "../../dst_blacklist.h"
#endif
struct msgid_var user_fr_timeout;
struct msgid_var user_fr_inv_timeout;
#ifdef TM_DIFF_RT_TIMEOUT
struct msgid_var user_rt_t1_timeout_ms;
struct msgid_var user_rt_t2_timeout_ms;
#endif
struct msgid_var user_inv_max_lifetime;
struct msgid_var user_noninv_max_lifetime;
/**
* \brief Check helper for configuration framework values
*
* Check helper for configuration framework values for internal use
* The val should be unsigned or positive, use
* <= instead of < to get read of gcc warning when
* sizeof(cell_member)==sizeof(val) (Note that this limits
* maximum value to max. type -1)
*/
#define SIZE_FIT_CHECK(cell_member, val, cfg_name) \
if (MAX_UVAR_VALUE(((struct cell*)0)->cell_member) <= (val)){ \
ERR("tm_init_timers: " cfg_name " too big: %lu (%lu ticks) " \
"- max %lu (%lu ticks) \n", TICKS_TO_MS((unsigned long)(val)),\
(unsigned long)(val), \
TICKS_TO_MS(MAX_UVAR_VALUE(((struct cell*)0)->cell_member)), \
MAX_UVAR_VALUE(((struct cell*)0)->cell_member)); \
goto error; \
}
/**
* \brief fix timer values to ticks
*/
int tm_init_timers(void)
{
default_tm_cfg.fr_timeout=MS_TO_TICKS(default_tm_cfg.fr_timeout);
default_tm_cfg.fr_inv_timeout=MS_TO_TICKS(default_tm_cfg.fr_inv_timeout);
default_tm_cfg.wait_timeout=MS_TO_TICKS(default_tm_cfg.wait_timeout);
default_tm_cfg.delete_timeout=MS_TO_TICKS(default_tm_cfg.delete_timeout);
default_tm_cfg.tm_max_inv_lifetime=MS_TO_TICKS(default_tm_cfg.tm_max_inv_lifetime);
default_tm_cfg.tm_max_noninv_lifetime=MS_TO_TICKS(default_tm_cfg.tm_max_noninv_lifetime);
/* fix 0 values to 1 tick (minimum possible wait time ) */
if (default_tm_cfg.fr_timeout==0) default_tm_cfg.fr_timeout=1;
if (default_tm_cfg.fr_inv_timeout==0) default_tm_cfg.fr_inv_timeout=1;
if (default_tm_cfg.wait_timeout==0) default_tm_cfg.wait_timeout=1;
if (default_tm_cfg.delete_timeout==0) default_tm_cfg.delete_timeout=1;
if (default_tm_cfg.rt_t2_timeout_ms==0) default_tm_cfg.rt_t2_timeout_ms=1;
if (default_tm_cfg.rt_t1_timeout_ms==0) default_tm_cfg.rt_t1_timeout_ms=1;
if (default_tm_cfg.tm_max_inv_lifetime==0) default_tm_cfg.tm_max_inv_lifetime=1;
if (default_tm_cfg.tm_max_noninv_lifetime==0) default_tm_cfg.tm_max_noninv_lifetime=1;
/* size fit checks */
SIZE_FIT_CHECK(fr_timeout, default_tm_cfg.fr_timeout, "fr_timer");
SIZE_FIT_CHECK(fr_inv_timeout, default_tm_cfg.fr_inv_timeout, "fr_inv_timer");
#ifdef TM_DIFF_RT_TIMEOUT
SIZE_FIT_CHECK(rt_t1_timeout_ms, default_tm_cfg.rt_t1_timeout_ms,
"retr_timer1");
SIZE_FIT_CHECK(rt_t2_timeout_ms, default_tm_cfg.rt_t2_timeout_ms,
"retr_timer2");
#endif
SIZE_FIT_CHECK(end_of_life, default_tm_cfg.tm_max_inv_lifetime, "max_inv_lifetime");
SIZE_FIT_CHECK(end_of_life, default_tm_cfg.tm_max_noninv_lifetime, "max_noninv_lifetime");
memset(&user_fr_timeout, 0, sizeof(user_fr_timeout));
memset(&user_fr_inv_timeout, 0, sizeof(user_fr_inv_timeout));
#ifdef TM_DIFF_RT_TIMEOUT
memset(&user_rt_t1_timeout_ms, 0, sizeof(user_rt_t1_timeout_ms));
memset(&user_rt_t2_timeout_ms, 0, sizeof(user_rt_t2_timeout_ms));
#endif
memset(&user_inv_max_lifetime, 0, sizeof(user_inv_max_lifetime));
memset(&user_noninv_max_lifetime, 0, sizeof(user_noninv_max_lifetime));
DBG("tm: tm_init_timers: fr=%d fr_inv=%d wait=%d delete=%d t1=%d t2=%d"
" max_inv_lifetime=%d max_noninv_lifetime=%d\n",
default_tm_cfg.fr_timeout, default_tm_cfg.fr_inv_timeout,
default_tm_cfg.wait_timeout, default_tm_cfg.delete_timeout,
default_tm_cfg.rt_t1_timeout_ms, default_tm_cfg.rt_t2_timeout_ms,
default_tm_cfg.tm_max_inv_lifetime, default_tm_cfg.tm_max_noninv_lifetime);
return 0;
error:
return -1;
}
/**
* \brief Internal macro for timer_fixup()
*
* Internal macro for timer_fixup(), performs size fit
* check if the timer name matches
*/
#define IF_IS_TIMER_NAME(cell_member, cfg_name) \
if ((name->len == sizeof(cfg_name)-1) && \
(memcmp(name->s, cfg_name, sizeof(cfg_name)-1)==0)) { \
SIZE_FIT_CHECK(cell_member, t, cfg_name); \
}
/**
* \brief Fixup function for the timer values
*
* Fixup function for the timer values, (called by the
* configuration framework)
* \param handle not used
* \param gname not used
* \param name not used
* \param val fixed timer value
* \return 0 on success, -1 on error
*/
int timer_fixup(void *handle, str *gname, str *name, void **val)
{
ticks_t t;
t = MS_TO_TICKS((unsigned int)(long)(*val));
/* fix 0 values to 1 tick (minimum possible wait time ) */
if (t == 0) t = 1;
/* size fix checks */
IF_IS_TIMER_NAME(fr_timeout, "fr_timer")
else IF_IS_TIMER_NAME(fr_inv_timeout, "fr_inv_timer")
else IF_IS_TIMER_NAME(end_of_life, "max_inv_lifetime")
else IF_IS_TIMER_NAME(end_of_life, "max_noninv_lifetime")
*val = (void *)(long)t;
return 0;
error:
return -1;
}
/** fixup function for timer values that are kept in ms.
* (called by the configuration framework)
* It checks if the value fits in the tm structures
*/
int timer_fixup_ms(void *handle, str *gname, str *name, void **val)
{
long t;
t = (long)(*val);
/* size fix checks */
#ifdef TM_DIFF_RT_TIMEOUT
IF_IS_TIMER_NAME(rt_t1_timeout_ms, "retr_timer1")
else IF_IS_TIMER_NAME(rt_t2_timeout_ms, "retr_timer2")
#endif
return 0;
error:
return -1;
}
/******************** handlers ***************************/
#ifndef TM_DEL_UNREF
/* returns number of ticks before retrying the del, or 0 if the del.
* was succesfull */
inline static ticks_t delete_cell( struct cell *p_cell, int unlock )
{
/* there may still be FR/RETR timers, which have been reset
(i.e., time_out==TIMER_DELETED) but are stilled linked to
timer lists and must be removed from there before the
structures are released
*/
unlink_timers( p_cell );
/* still in use ... don't delete */
if ( IS_REFFED_UNSAFE(p_cell) ) {
if (unlock) UNLOCK_HASH(p_cell->hash_index);
DBG("DEBUG: delete_cell %p: can't delete -- still reffed (%d)\n",
p_cell, p_cell->ref_count);
/* delay the delete */
/* TODO: change refcnts and delete on refcnt==0 */
return cfg_get(tm, tm_cfg, delete_timeout);
} else {
if (unlock) UNLOCK_HASH(p_cell->hash_index);
#ifdef EXTRA_DEBUG
DBG("DEBUG: delete transaction %p\n", p_cell );
#endif
free_cell( p_cell );
return 0;
}
}
#endif /* TM_DEL_UNREF */
/* generate a fake reply
* it assumes the REPLY_LOCK is already held and returns unlocked */
static void fake_reply(struct cell *t, int branch, int code )
{
struct cancel_info cancel_data;
short do_cancel_branch;
enum rps reply_status;
init_cancel_info(&cancel_data);
do_cancel_branch = is_invite(t) && prepare_cancel_branch(t, branch, 0);
/* mark branch as canceled */
t->uac[branch].request.flags|=F_RB_CANCELED;
if ( is_local(t) ) {
reply_status=local_reply( t, FAKED_REPLY, branch,
code, &cancel_data );
} else {
/* rely reply, but don't put on wait, we still need t
* to send the cancels */
reply_status=relay_reply( t, FAKED_REPLY, branch, code,
&cancel_data, 0 );
}
/* now when out-of-lock do the cancel I/O */
#ifdef CANCEL_REASON_SUPPORT
if (do_cancel_branch) cancel_branch(t, branch, &cancel_data.reason, 0);
#else /* CANCEL_REASON_SUPPORT */
if (do_cancel_branch) cancel_branch(t, branch, 0);
#endif /* CANCEL_REASON_SUPPORT */
/* it's cleaned up on error; if no error occurred and transaction
completed regularly, I have to clean-up myself
*/
if (reply_status == RPS_COMPLETED)
put_on_wait(t);
}
/* return (ticks_t)-1 on error/disable and 0 on success */
inline static ticks_t retransmission_handler( struct retr_buf *r_buf )
{
#ifdef EXTRA_DEBUG
if (r_buf->my_T->flags & T_IN_AGONY) {
LOG( L_ERR, "ERROR: transaction %p scheduled for deletion and"
" called from RETR timer (flags %x)\n",
r_buf->my_T, r_buf->my_T->flags );
abort();
}
#endif
if ( r_buf->activ_type==TYPE_LOCAL_CANCEL
|| r_buf->activ_type==TYPE_REQUEST ) {
#ifdef EXTRA_DEBUG
DBG("DEBUG: retransmission_handler : "
"request resending (t=%p, %.9s ... )\n",
r_buf->my_T, r_buf->buffer);
#endif
if (SEND_BUFFER( r_buf )==-1) {
/* disable retr. timers => return -1 */
fake_reply(r_buf->my_T, r_buf->branch, 503 );
return (ticks_t)-1;
}
if (unlikely(has_tran_tmcbs(r_buf->my_T, TMCB_REQUEST_SENT)))
run_trans_callbacks_with_buf(TMCB_REQUEST_SENT, r_buf,
0, 0, TMCB_RETR_F);
} else {
#ifdef EXTRA_DEBUG
DBG("DEBUG: retransmission_handler : "
"reply resending (t=%p, %.9s ... )\n",
r_buf->my_T, r_buf->buffer);
#endif
t_retransmit_reply(r_buf->my_T);
}
return 0;
}
inline static void final_response_handler( struct retr_buf* r_buf,
struct cell* t)
{
int silent;
#ifdef USE_DNS_FAILOVER
/*int i;
int added_branches;
*/
int branch_ret;
int prev_branch;
ticks_t now;
#endif
# ifdef EXTRA_DEBUG
if (t->flags & T_IN_AGONY)
{
LOG( L_ERR, "ERROR: transaction %p scheduled for deletion and"
" called from FR timer (flags %x)\n", t, t->flags);
abort();
}
# endif
/* FR for local cancels.... */
if (r_buf->activ_type==TYPE_LOCAL_CANCEL)
{
#ifdef TIMER_DEBUG
DBG("DEBUG: final_response_handler: stop retr for Local Cancel\n");
#endif
return;
}
/* FR for replies (negative INVITE replies) */
if (r_buf->activ_type>0) {
# ifdef EXTRA_DEBUG
if (t->uas.request->REQ_METHOD!=METHOD_INVITE
|| t->uas.status < 200 ) {
LOG(L_CRIT, "BUG: final_response_handler: unknown type reply"
" buffer\n");
abort();
}
# endif
put_on_wait( t );
return;
};
/* lock reply processing to determine how to proceed reliably */
LOCK_REPLIES( t );
/* now it can be only a request retransmission buffer;
try if you can simply discard the local transaction
state without compellingly removing it from the
world */
silent=
/* don't go silent if disallowed globally ... */
cfg_get(tm, tm_cfg, noisy_ctimer)==0
/* ... or for this particular transaction */
&& has_noisy_ctimer(t) == 0
/* not for UACs */
&& !is_local(t)
/* invites only */
&& is_invite(t)
/* parallel forking does not allow silent state discarding */
&& t->nr_of_outgoings==1
/* on_negativ reply handler not installed -- serial forking
* could occur otherwise */
&& t->on_negative==0
/* the same for FAILURE callbacks */
&& !has_tran_tmcbs( t, TMCB_ON_FAILURE_RO|TMCB_ON_FAILURE)
/* something received -- we will not be silent on error */
&& t->uac[r_buf->branch].last_received==0;
if (silent) {
UNLOCK_REPLIES(t);
#ifdef EXTRA_DEBUG
DBG("DEBUG: final_response_handler: transaction silently dropped (%p)"
", branch %d, last_received %d\n",t, r_buf->branch,
t->uac[r_buf->branch].last_received);
#endif
put_on_wait( t );
return;
}
#ifdef EXTRA_DEBUG
DBG("DEBUG: final_response_handler:stop retr. and send CANCEL (%p)\n", t);
#endif
if ((r_buf->branch < MAX_BRANCHES) && /* r_buf->branch is always >=0 */
(t->uac[r_buf->branch].last_received==0) &&
(t->uac[r_buf->branch].request.buffer!=NULL) /* not a blind UAC */
){
/* no reply received */
#ifdef USE_DST_BLACKLIST
if (r_buf->my_T
&& r_buf->my_T->uas.request
&& (r_buf->my_T->uas.request->REQ_METHOD &
cfg_get(tm, tm_cfg, tm_blst_methods_add))
)
dst_blacklist_add( BLST_ERR_TIMEOUT, &r_buf->dst,
r_buf->my_T->uas.request);
#endif
#ifdef USE_DNS_FAILOVER
/* if this is an invite, the destination resolves to more ips, and
* it still hasn't passed more than fr_inv_timeout since we
* started, add another branch/uac */
if (cfg_get(core, core_cfg, use_dns_failover)){
now=get_ticks_raw();
if ((s_ticks_t)(t->end_of_life-now)>0){
branch_ret=add_uac_dns_fallback(t, t->uas.request,
&t->uac[r_buf->branch], 0);
prev_branch=-1;
while((branch_ret>=0) &&(branch_ret!=prev_branch)){
prev_branch=branch_ret;
branch_ret=t_send_branch(t, branch_ret, t->uas.request ,
0, 0);
}
}
}
#endif
}
fake_reply(t, r_buf->branch, 408);
}
/* handles retransmissions and fr timers */
/* the following assumption are made (to avoid deleting/re-adding the timer):
* retr_buf->retr_interval < ( 1<<((sizeof(ticks_t)*8-1) )
* if retr_buf->retr_interval==0 => timer disabled
* ==(ticks_t) -1 => retr. disabled (fr working)
* retr_buf->retr_interval & (1 <<(sizeof(ticks_t)*8-1) => retr. & fr reset
* (we never reset only retr, it's either reset both of them or retr
* disabled & reset fr). In this case the fr_origin will contain the
* "time" of the reset and next retr should occur at
* fr->origin+retr_interval (we also assume that we'll never reset retr
* to a lower value then the current one)
*/
ticks_t retr_buf_handler(ticks_t ticks, struct timer_ln* tl, void *p)
{
struct retr_buf* rbuf ;
ticks_t fr_remainder;
ticks_t retr_remainder;
ticks_t retr_interval;
unsigned long new_retr_interval_ms;
unsigned long crt_retr_interval_ms;
struct cell *t;
rbuf=(struct retr_buf*)
((void*)tl-(void*)(&((struct retr_buf*)0)->timer));
membar_depends(); /* to be on the safe side */
t=rbuf->my_T;
#ifdef TIMER_DEBUG
DBG("tm: timer retr_buf_handler @%d (%p -> %p -> %p)\n",
ticks, tl, rbuf, t);
#endif
if (unlikely(rbuf->flags & F_RB_DEL_TIMER)){
/* timer marked for deletion */
rbuf->t_active=0; /* mark it as removed */
/* a membar is not really needed, in the very unlikely case that
* another process will see old t_active's value and will try to
* delete the timer again, but since timer_del it's safe in this cases
* it will be a no-op */
return 0;
}
/* overflow safe check (should work ok for fr_intervals < max ticks_t/2) */
if ((s_ticks_t)(rbuf->fr_expire-ticks)<=0){
/* final response */
rbuf->t_active=0; /* mark the timer as removed
(both timers disabled)
a little race risk, but
nothing bad would happen */
rbuf->flags|=F_RB_TIMEOUT;
/* WARNING: the next line depends on taking care not to start the
* wait timer before finishing with t (if this is not
* guaranteed then comment the timer_allow_del() line) */
timer_allow_del(); /* [optional] allow timer_dels, since we're done
and there is no race risk */
final_response_handler(rbuf, t);
return 0;
}else{
/* 4 possible states running (t1), t2, paused, disabled */
if ((s_ticks_t)(rbuf->retr_expire-ticks)<=0){
if (rbuf->flags & F_RB_RETR_DISABLED)
goto disabled;
crt_retr_interval_ms = (unsigned long)p;
/* get the current interval from timer param. */
if (unlikely((rbuf->flags & F_RB_T2) ||
(crt_retr_interval_ms > RT_T2_TIMEOUT_MS(rbuf)))){
retr_interval = MS_TO_TICKS(RT_T2_TIMEOUT_MS(rbuf));
new_retr_interval_ms = RT_T2_TIMEOUT_MS(rbuf);
}else{
retr_interval = MS_TO_TICKS(crt_retr_interval_ms);
new_retr_interval_ms=crt_retr_interval_ms<<1;
}
#ifdef TIMER_DEBUG
DBG("tm: timer: retr: new interval %ld ms / %d ticks"
" (max %d ms)\n", new_retr_interval_ms, retr_interval,
RT_T2_TIMEOUT_MS(rbuf));
#endif
/* we could race with the reply_received code, but the
* worst thing that can happen is to delay a reset_to_t2
* for crt_interval and send an extra retr.*/
rbuf->retr_expire=ticks+retr_interval;
/* set new interval to -1 on error, or retr_int. on success */
retr_remainder=retransmission_handler(rbuf) | retr_interval;
/* store the next retr. interval in ms inside the timer struct,
* in the data member */
tl->data=(void*)(new_retr_interval_ms);
}else{
retr_remainder= rbuf->retr_expire-ticks;
DBG("tm: timer: retr: nothing to do, expire in %d\n",
retr_remainder);
}
}
/* skip: */
/* return minimum of the next retransmission handler and the
* final response (side benefit: it properly cancels timer if ret==0 and
* sleeps for fr_remainder if retr. is canceled [==(ticks_t)-1]) */
fr_remainder=rbuf->fr_expire-ticks; /* to be more precise use
get_ticks_raw() instead of ticks
(but make sure that
crt. ticks < fr_expire */
#ifdef TIMER_DEBUG
DBG("tm: timer retr_buf_handler @%d (%p ->%p->%p) exiting min (%d, %d)\n",
ticks, tl, rbuf, t, retr_remainder, fr_remainder);
#endif
#ifdef EXTRA_DEBUG
if (retr_remainder==0 || fr_remainder==0){
BUG("tm: timer retr_buf_handler: 0 remainder => disabling timer!: "
"retr_remainder=%d, fr_remainder=%d\n", retr_remainder,
fr_remainder);
}
#endif
if (retr_remainder<fr_remainder)
return retr_remainder;
else{
/* hack to switch to the slow timer */
#ifdef TM_FAST_RETR_TIMER
tl->flags&=~F_TIMER_FAST;
#endif
return fr_remainder;
}
disabled:
return rbuf->fr_expire-ticks;
}
ticks_t wait_handler(ticks_t ti, struct timer_ln *wait_tl, void* data)
{
struct cell *p_cell;
ticks_t ret;
p_cell=(struct cell*)data;
#ifdef TIMER_DEBUG
DBG("DEBUG: WAIT timer hit @%d for %p (timer_lm %p)\n",
ti, p_cell, wait_tl);
#endif
#ifdef TM_DEL_UNREF
/* stop cancel timers if any running */
if ( is_invite(p_cell) ) cleanup_localcancel_timers( p_cell );
/* remove the cell from the hash table */
LOCK_HASH( p_cell->hash_index );
remove_from_hash_table_unsafe( p_cell );
UNLOCK_HASH( p_cell->hash_index );
p_cell->flags |= T_IN_AGONY;
UNREF_FREE(p_cell);
ret=0;
#else /* TM_DEL_UNREF */
if (p_cell->flags & T_IN_AGONY){
/* delayed delete */
/* we call delete now without any locking on hash/ref_count;
we can do that because delete_handler is only entered after
the delete timer was installed from wait_handler, which
removed transaction from hash table and did not destroy it
because some processes were using it; that means that the
processes currently using the transaction can unref and no
new processes can ref -- we can wait until ref_count is
zero safely without locking
*/
ret=delete_cell( p_cell, 0 /* don't unlock on return */ );
}else {
/* stop cancel timers if any running */
if ( is_invite(p_cell) ) cleanup_localcancel_timers( p_cell );
/* remove the cell from the hash table */
LOCK_HASH( p_cell->hash_index );
remove_from_hash_table_unsafe( p_cell );
p_cell->flags |= T_IN_AGONY;
/* delete (returns with UNLOCK-ed_HASH) */
ret=delete_cell( p_cell, 1 /* unlock on return */ );
}
#endif /* TM_DEL_UNREF */
return ret;
}
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