0010-timer-Clean-up-usage-of-timer-heap.patch

From f7d91ca2a3c562066f95db066381a8b956ded98f Mon Sep 17 00:00:00 2001
From: George Joseph <gjoseph@digium.com>
Date: Tue, 2 Jan 2018 06:36:46 -0700
Subject: [PATCH 5/5] timer: Clean up usage of timer heap

Added a new pj_timer_entry_reset function that resets a timer_entry
for re-use.

Changed direct settings of timer_entry fields to use
pj_timer_entry_init and pj_timer_entry_reset.

Fixed issues where timers were being rescheduled incorrectly.
---
 pjlib/include/pj/timer.h             | 14 ++++++++++++++
 pjlib/src/pj/ssl_sock_ossl.c         |  8 +++++---
 pjlib/src/pj/timer.c                 | 12 ++++++++++++
 pjnath/src/pjnath/ice_session.c      |  9 ++++++++-
 pjnath/src/pjnath/nat_detect.c       |  2 ++
 pjnath/src/pjnath/stun_sock.c        |  2 +-
 pjnath/src/pjnath/stun_transaction.c | 10 +++++-----
 pjnath/src/pjnath/turn_session.c     |  3 +++
 pjnath/src/pjnath/turn_sock.c        |  1 +
 pjnath/src/pjturn-srv/allocation.c   |  4 ++--
 pjnath/src/pjturn-srv/listener_tcp.c |  2 +-
 pjsip/src/pjsip-simple/evsub.c       |  6 +++---
 pjsip/src/pjsip/sip_endpoint.c       |  4 +++-
 pjsip/src/pjsip/sip_transaction.c    |  9 +++------
 pjsip/src/pjsip/sip_transport.c      |  3 +--
 15 files changed, 64 insertions(+), 25 deletions(-)

diff --git a/pjlib/include/pj/timer.h b/pjlib/include/pj/timer.h
index df6155a..90fc8ac 100644
--- a/pjlib/include/pj/timer.h
+++ b/pjlib/include/pj/timer.h
@@ -213,6 +213,20 @@ PJ_DECL(pj_timer_entry*) pj_timer_entry_init( pj_timer_entry *entry,
                                               pj_timer_heap_callback *cb );
 
 /**
+ * Reset a timer entry. Application should call this function before reusing
+ * the timer entry.
+ *
+ * @param entry     The timer entry to be initialized.
+ * @param id        Arbitrary ID assigned by the user/owner of this entry.
+ *                  Applications can use this ID to distinguish multiple
+ *                  timer entries that share the same callback and user_data.
+ *
+ * @return          The timer entry itself.
+ */
+PJ_DECL(pj_timer_entry*) pj_timer_entry_reset( pj_timer_entry *entry,
+                                             int id);
+
+/**
  * Queries whether a timer entry is currently running.
  *
  * @param entry     The timer entry to query.
diff --git a/pjlib/src/pj/ssl_sock_ossl.c b/pjlib/src/pj/ssl_sock_ossl.c
index 738fb8b..fb3b359 100644
--- a/pjlib/src/pj/ssl_sock_ossl.c
+++ b/pjlib/src/pj/ssl_sock_ossl.c
@@ -304,6 +304,7 @@ struct pj_ssl_cert_t
 static write_data_t* alloc_send_data(pj_ssl_sock_t *ssock, pj_size_t len);
 static void free_send_data(pj_ssl_sock_t *ssock, write_data_t *wdata);
 static pj_status_t flush_delayed_send(pj_ssl_sock_t *ssock);
+static void on_timer(pj_timer_heap_t *th, struct pj_timer_entry *te);
 
 /*
  *******************************************************************
@@ -1726,7 +1727,8 @@ static pj_bool_t on_handshake_complete(pj_ssl_sock_t *ssock,
 		    pj_timer_heap_cancel(ssock->param.timer_heap,
 					 &ssock->timer);
 		}
-		ssock->timer.id = TIMER_CLOSE;
+
+		pj_timer_entry_reset(&ssock->timer, TIMER_CLOSE);
 		pj_time_val_normalize(&interval);
 		if (pj_timer_heap_schedule(ssock->param.timer_heap, 
 					   &ssock->timer, &interval) != 0)
@@ -2492,7 +2494,7 @@ static pj_bool_t asock_on_accept_complete (pj_activesock_t *asock,
 	ssock->param.timeout.msec != 0))
     {
 	pj_assert(ssock->timer.id == TIMER_NONE);
-	ssock->timer.id = TIMER_HANDSHAKE_TIMEOUT;
+	pj_timer_entry_reset(&ssock->timer, TIMER_HANDSHAKE_TIMEOUT);
 	status = pj_timer_heap_schedule(ssock->param.timer_heap, 
 				        &ssock->timer,
 					&ssock->param.timeout);
@@ -3538,7 +3540,7 @@ PJ_DEF(pj_status_t) pj_ssl_sock_start_connect( pj_ssl_sock_t *ssock,
 	ssock->param.timeout.msec != 0))
     {
 	pj_assert(ssock->timer.id == TIMER_NONE);
-	ssock->timer.id = TIMER_HANDSHAKE_TIMEOUT;
+	pj_timer_entry_reset(&ssock->timer, TIMER_HANDSHAKE_TIMEOUT);
 	status = pj_timer_heap_schedule(ssock->param.timer_heap,
 					&ssock->timer,
 				        &ssock->param.timeout);
diff --git a/pjlib/src/pj/timer.c b/pjlib/src/pj/timer.c
index 90a95e3..1312611 100644
--- a/pjlib/src/pj/timer.c
+++ b/pjlib/src/pj/timer.c
@@ -472,6 +472,18 @@ PJ_DEF(pj_timer_entry*) pj_timer_entry_init( pj_timer_entry *entry,
     return entry;
 }
 
+PJ_DEF(pj_timer_entry*) pj_timer_entry_reset( pj_timer_entry *entry,
+                                             int id)
+{
+    entry->id = id;
+    entry->_grp_lock = NULL;
+    entry->_timer_id = -1;
+    entry->_timer_value = (pj_time_val){0, 0};
+
+    return entry;
+}
+
+
 PJ_DEF(pj_bool_t) pj_timer_entry_running( pj_timer_entry *entry )
 {
     return (entry->_timer_id >= 1);
diff --git a/pjnath/src/pjnath/ice_session.c b/pjnath/src/pjnath/ice_session.c
index c51dba7..cbee91d 100644
--- a/pjnath/src/pjnath/ice_session.c
+++ b/pjnath/src/pjnath/ice_session.c
@@ -1246,6 +1246,7 @@ done:
 		     ice->comp_cnt;
 	pj_time_val_normalize(&delay);
 
+	pj_timer_entry_reset(&ice->timer, TIMER_KEEP_ALIVE);
 	pj_timer_heap_schedule_w_grp_lock(ice->stun_cfg.timer_heap,
 	                                  &ice->timer, &delay,
 	                                  TIMER_KEEP_ALIVE,
@@ -1276,7 +1277,7 @@ static void on_ice_complete(pj_ice_sess *ice, pj_status_t status)
 	/* Call callback */
 	if (ice->cb.on_ice_complete) {
 	    pj_time_val delay = {0, 0};
-
+	    pj_timer_entry_reset(&ice->timer, TIMER_COMPLETION_CALLBACK);
 	    pj_timer_heap_schedule_w_grp_lock(ice->stun_cfg.timer_heap,
 	                                      &ice->timer, &delay,
 	                                      TIMER_COMPLETION_CALLBACK,
@@ -1507,6 +1508,7 @@ static pj_bool_t on_check_complete(pj_ice_sess *ice,
 		    delay.sec = 0;
 		    delay.msec = ice->opt.controlled_agent_want_nom_timeout;
 		    pj_time_val_normalize(&delay);
+		    pj_timer_entry_reset(&ice->timer, TIMER_CONTROLLED_WAIT_NOM);
 
 		    pj_timer_heap_schedule_w_grp_lock(
 					ice->stun_cfg.timer_heap,
@@ -1597,6 +1599,7 @@ static pj_bool_t on_check_complete(pj_ice_sess *ice,
 	delay.sec = 0;
 	delay.msec = ice->opt.nominated_check_delay;
 	pj_time_val_normalize(&delay);
+        pj_timer_entry_reset(&ice->timer, TIMER_START_NOMINATED_CHECK);
 
 	pj_timer_heap_schedule_w_grp_lock(ice->stun_cfg.timer_heap,
 	                                  &ice->timer, &delay,
@@ -1929,6 +1932,8 @@ static pj_status_t start_periodic_check(pj_timer_heap_t *th,
 	pj_time_val timeout = {0, PJ_ICE_TA_VAL};
 
 	pj_time_val_normalize(&timeout);
+        pj_timer_entry_reset(&ice->timer, PJ_TRUE);
+
 	pj_timer_heap_schedule_w_grp_lock(th, te, &timeout, PJ_TRUE,
 	                                  ice->grp_lock);
     }
@@ -1986,6 +1991,7 @@ static void start_nominated_check(pj_ice_sess *ice)
                                    &ice->clist.timer, PJ_FALSE);
 
     delay.sec = delay.msec = 0;
+    pj_timer_entry_reset(&ice->timer, PJ_TRUE);
     status = pj_timer_heap_schedule_w_grp_lock(ice->stun_cfg.timer_heap,
                                                &ice->clist.timer, &delay,
                                                PJ_TRUE,
@@ -2125,6 +2131,7 @@ PJ_DEF(pj_status_t) pj_ice_sess_start_check(pj_ice_sess *ice)
      * return start_periodic_check(ice->stun_cfg.timer_heap, &clist->timer);
      */
     delay.sec = delay.msec = 0;
+    pj_timer_entry_reset(&ice->timer, PJ_TRUE);
     status = pj_timer_heap_schedule_w_grp_lock(ice->stun_cfg.timer_heap,
                                                &clist->timer, &delay,
                                                PJ_TRUE, ice->grp_lock);
diff --git a/pjnath/src/pjnath/nat_detect.c b/pjnath/src/pjnath/nat_detect.c
index 31b06c3..d1d7373 100644
--- a/pjnath/src/pjnath/nat_detect.c
+++ b/pjnath/src/pjnath/nat_detect.c
@@ -414,6 +414,7 @@ static void end_session(nat_detect_session *sess,
     delay.msec = 0;
 
     sess->timer.id = TIMER_DESTROY;
+    pj_timer_entry_init(&sess->timer, TIMER_DESTROY, sess, &on_sess_timer);
     pj_timer_heap_schedule(sess->timer_heap, &sess->timer, &delay);
 }
 
@@ -933,6 +934,7 @@ static void on_sess_timer(pj_timer_heap_t *th,
 
 	if (next_timer) {
 	    pj_time_val delay = {0, TEST_INTERVAL};
+	    pj_timer_entry_reset(te, TIMER_TEST);
 	    pj_timer_heap_schedule(th, te, &delay);
 	} else {
 	    te->id = 0;
diff --git a/pjnath/src/pjnath/stun_sock.c b/pjnath/src/pjnath/stun_sock.c
index 4031bb3..af3cc4a 100644
--- a/pjnath/src/pjnath/stun_sock.c
+++ b/pjnath/src/pjnath/stun_sock.c
@@ -880,7 +880,7 @@ static void start_ka_timer(pj_stun_sock *stun_sock)
 
 	delay.sec = stun_sock->ka_interval;
 	delay.msec = 0;
-
+	pj_timer_entry_reset(&stun_sock->ka_timer, PJ_TRUE);
 	pj_timer_heap_schedule_w_grp_lock(stun_sock->stun_cfg.timer_heap,
 	                                  &stun_sock->ka_timer,
 	                                  &delay, PJ_TRUE,
diff --git a/pjnath/src/pjnath/stun_transaction.c b/pjnath/src/pjnath/stun_transaction.c
index 28f6230..ad87b7b 100644
--- a/pjnath/src/pjnath/stun_transaction.c
+++ b/pjnath/src/pjnath/stun_transaction.c
@@ -86,11 +86,8 @@ PJ_DEF(pj_status_t) pj_stun_client_tsx_create(pj_stun_config *cfg,
     tsx->grp_lock = grp_lock;
     pj_memcpy(&tsx->cb, cb, sizeof(*cb));
 
-    tsx->retransmit_timer.cb = &retransmit_timer_callback;
-    tsx->retransmit_timer.user_data = tsx;
-
-    tsx->destroy_timer.cb = &destroy_timer_callback;
-    tsx->destroy_timer.user_data = tsx;
+    pj_timer_entry_init(&tsx->retransmit_timer, 0, tsx, &retransmit_timer_callback);
+    pj_timer_entry_init(&tsx->destroy_timer, 0, tsx, &destroy_timer_callback);
 
     pj_ansi_snprintf(tsx->obj_name, sizeof(tsx->obj_name), "utsx%p", tsx);
 
@@ -120,6 +117,7 @@ PJ_DEF(pj_status_t) pj_stun_client_tsx_schedule_destroy(
     pj_timer_heap_cancel_if_active(tsx->timer_heap, &tsx->retransmit_timer,
                                    TIMER_INACTIVE);
 
+    pj_timer_entry_reset(&tsx->destroy_timer, TIMER_ACTIVE);
     status = pj_timer_heap_schedule_w_grp_lock(tsx->timer_heap,
                                                &tsx->destroy_timer, delay,
                                                TIMER_ACTIVE, tsx->grp_lock);
@@ -237,6 +235,7 @@ static pj_status_t tsx_transmit_msg(pj_stun_client_tsx *tsx,
 	 * cancel it (as opposed to when schedule_timer() failed we cannot
 	 * cancel transmission).
 	 */;
+	pj_timer_entry_reset(&tsx->retransmit_timer, TIMER_ACTIVE);
 	status = pj_timer_heap_schedule_w_grp_lock(tsx->timer_heap,
 						   &tsx->retransmit_timer,
 						   &tsx->retransmit_time,
@@ -315,6 +314,7 @@ PJ_DEF(pj_status_t) pj_stun_client_tsx_send_msg(pj_stun_client_tsx *tsx,
 	 * cancel it (as opposed to when schedule_timer() failed we cannot
 	 * cancel transmission).
 	 */;
+        pj_timer_entry_reset(&tsx->retransmit_timer, TIMER_ACTIVE);
 	status = pj_timer_heap_schedule_w_grp_lock(tsx->timer_heap,
 	                                           &tsx->retransmit_timer,
 	                                           &tsx->retransmit_time,
diff --git a/pjnath/src/pjnath/turn_session.c b/pjnath/src/pjnath/turn_session.c
index bbea027..e4685e6 100644
--- a/pjnath/src/pjnath/turn_session.c
+++ b/pjnath/src/pjnath/turn_session.c
@@ -431,6 +431,7 @@ static void sess_shutdown(pj_turn_session *sess,
 
 	pj_timer_heap_cancel_if_active(sess->timer_heap, &sess->timer,
 	                               TIMER_NONE);
+	pj_timer_entry_reset(&sess->timer, TIMER_DESTROY);
 	pj_timer_heap_schedule_w_grp_lock(sess->timer_heap, &sess->timer,
 	                                  &delay, TIMER_DESTROY,
 	                                  sess->grp_lock);
@@ -1434,6 +1435,7 @@ static void on_allocate_success(pj_turn_session *sess,
 	timeout.sec = sess->ka_interval;
 	timeout.msec = 0;
 
+	pj_timer_entry_reset(&sess->timer, TIMER_KEEP_ALIVE);
 	pj_timer_heap_schedule_w_grp_lock(sess->timer_heap, &sess->timer,
 					  &timeout, TIMER_KEEP_ALIVE,
 					  sess->grp_lock);
@@ -2080,6 +2082,7 @@ static void on_timer_event(pj_timer_heap_t *th, pj_timer_entry *e)
 	    delay.sec = sess->ka_interval;
 	    delay.msec = 0;
 
+	    pj_timer_entry_reset(&sess->timer, TIMER_KEEP_ALIVE);
 	    pj_timer_heap_schedule_w_grp_lock(sess->timer_heap, &sess->timer,
 	                                      &delay, TIMER_KEEP_ALIVE,
 	                                      sess->grp_lock);
diff --git a/pjnath/src/pjnath/turn_sock.c b/pjnath/src/pjnath/turn_sock.c
index a30ab51..5078580 100644
--- a/pjnath/src/pjnath/turn_sock.c
+++ b/pjnath/src/pjnath/turn_sock.c
@@ -928,6 +928,7 @@ static void turn_on_state(pj_turn_session *sess,
 
 	pj_timer_heap_cancel_if_active(turn_sock->cfg.timer_heap,
 	                               &turn_sock->timer, 0);
+	pj_timer_entry_reset(&turn_sock->timer, TIMER_DESTROY);
 	pj_timer_heap_schedule_w_grp_lock(turn_sock->cfg.timer_heap,
 	                                  &turn_sock->timer,
 	                                  &delay, TIMER_DESTROY,
diff --git a/pjnath/src/pjturn-srv/allocation.c b/pjnath/src/pjturn-srv/allocation.c
index 6c9c9ce..8853392 100644
--- a/pjnath/src/pjturn-srv/allocation.c
+++ b/pjnath/src/pjturn-srv/allocation.c
@@ -513,7 +513,7 @@ static void alloc_shutdown(pj_turn_allocation *alloc)
      */
 
     /* Schedule destroy timer */
-    alloc->relay.timer.id = TIMER_ID_DESTROY;
+    pj_timer_entry_reset(&alloc->relay.timer, TIMER_ID_DESTROY);
     pj_timer_heap_schedule(alloc->server->core.timer_heap,
 			   &alloc->relay.timer, &destroy_delay);
 }
@@ -538,7 +538,7 @@ static pj_status_t resched_timeout(pj_turn_allocation *alloc)
     delay.sec = alloc->relay.lifetime;
     delay.msec = 0;
 
-    alloc->relay.timer.id = TIMER_ID_TIMEOUT;
+    pj_timer_entry_reset(&alloc->relay.timer, TIMER_ID_TIMEOUT);
     status = pj_timer_heap_schedule(alloc->server->core.timer_heap,
 				    &alloc->relay.timer, &delay);
     if (status != PJ_SUCCESS) {
diff --git a/pjnath/src/pjturn-srv/listener_tcp.c b/pjnath/src/pjturn-srv/listener_tcp.c
index 796ed47..4a9550c 100644
--- a/pjnath/src/pjturn-srv/listener_tcp.c
+++ b/pjnath/src/pjturn-srv/listener_tcp.c
@@ -475,7 +475,7 @@ static void tcp_dec_ref(pj_turn_transport *tp,
 
     if (tcp->ref_cnt == 0 && tcp->timer.id == TIMER_NONE) {
 	pj_time_val delay = { SHUTDOWN_DELAY, 0 };
-	tcp->timer.id = TIMER_DESTROY;
+	pj_timer_entry_reset(&tcp->timer, TIMER_DESTROY);
 	pj_timer_heap_schedule(tcp->base.listener->server->core.timer_heap,
 			       &tcp->timer, &delay);
     }
diff --git a/pjsip/src/pjsip-simple/evsub.c b/pjsip/src/pjsip-simple/evsub.c
index eb66665..7748853 100644
--- a/pjsip/src/pjsip-simple/evsub.c
+++ b/pjsip/src/pjsip-simple/evsub.c
@@ -518,6 +518,7 @@ static void set_timer( pjsip_evsub *sub, int timer_id,
 	timeout.sec = seconds;
 	timeout.msec = 0;
 
+	pj_timer_entry_reset(&sub->timer, timer_id);
 	pj_timer_heap_schedule_w_grp_lock(
 			    pjsip_endpt_get_timer_heap(sub->endpt),
 			    &sub->timer, &timeout, timer_id, sub->grp_lock);
@@ -655,7 +656,7 @@ static void on_timer( pj_timer_heap_t *timer_heap,
     /* If this timer entry has just been rescheduled or cancelled
      * while waiting for dialog mutex, just return (see #1885 scenario 1).
      */
-    if (pj_timer_entry_running(entry) || entry->id == TIMER_TYPE_NONE) {
+    if (entry->id == TIMER_TYPE_NONE) {
 	pjsip_dlg_dec_lock(sub->dlg);
 	return;
     }
@@ -786,8 +787,7 @@ static pj_status_t evsub_create( pjsip_dialog *dlg,
     		  pjsip_hdr_clone(sub->pool, pkg->pkg_accept);
     pj_list_init(&sub->sub_hdr_list);
 
-    sub->timer.user_data = sub;
-    sub->timer.cb = &on_timer;
+    pj_timer_entry_init(&sub->timer, 0, sub, &on_timer);
 
     /* Set name. */
     pj_ansi_snprintf(sub->obj_name, PJ_ARRAY_SIZE(sub->obj_name),
diff --git a/pjsip/src/pjsip/sip_endpoint.c b/pjsip/src/pjsip/sip_endpoint.c
index d810781..5c98a5b 100644
--- a/pjsip/src/pjsip/sip_endpoint.c
+++ b/pjsip/src/pjsip/sip_endpoint.c
@@ -788,6 +788,7 @@ PJ_DEF(pj_status_t) pjsip_endpt_schedule_timer_dbg(pjsip_endpoint *endpt,
 {
     PJ_LOG(6, (THIS_FILE, "pjsip_endpt_schedule_timer(entry=%p, delay=%u.%u)",
 			 entry, delay->sec, delay->msec));
+    pj_timer_entry_reset(entry, entry->id);
     return pj_timer_heap_schedule_dbg(endpt->timer_heap, entry, delay,
                                       src_file, src_line);
 }
@@ -798,6 +799,7 @@ PJ_DEF(pj_status_t) pjsip_endpt_schedule_timer( pjsip_endpoint *endpt,
 {
     PJ_LOG(6, (THIS_FILE, "pjsip_endpt_schedule_timer(entry=%p, delay=%u.%u)",
 			 entry, delay->sec, delay->msec));
+    pj_timer_entry_reset(entry, entry->id);
     return pj_timer_heap_schedule( endpt->timer_heap, entry, delay );
 }
 #endif
@@ -809,7 +811,7 @@ PJ_DEF(void) pjsip_endpt_cancel_timer( pjsip_endpoint *endpt,
 				       pj_timer_entry *entry )
 {
     PJ_LOG(6, (THIS_FILE, "pjsip_endpt_cancel_timer(entry=%p)", entry));
-    pj_timer_heap_cancel( endpt->timer_heap, entry );
+    pj_timer_heap_cancel_if_active( endpt->timer_heap, entry, 0 );
 }
 
 /*
diff --git a/pjsip/src/pjsip/sip_transaction.c b/pjsip/src/pjsip/sip_transaction.c
index 4b7f852..173bd6a 100644
--- a/pjsip/src/pjsip/sip_transaction.c
+++ b/pjsip/src/pjsip/sip_transaction.c
@@ -978,6 +978,7 @@ static pj_status_t tsx_schedule_timer(pjsip_transaction *tsx,
     pj_status_t status;
 
     pj_assert(active_id != 0);
+    pj_timer_entry_reset(entry, active_id);
     status = pj_timer_heap_schedule_w_grp_lock(timer_heap, entry,
                                                delay, active_id,
                                                tsx->grp_lock);
@@ -1019,12 +1020,8 @@ static pj_status_t tsx_create( pjsip_module *tsx_user,
     pj_memcpy(pool->obj_name, tsx->obj_name, sizeof(pool->obj_name));
 
     tsx->handle_200resp = 1;
-    tsx->retransmit_timer.id = TIMER_INACTIVE;
-    tsx->retransmit_timer.user_data = tsx;
-    tsx->retransmit_timer.cb = &tsx_timer_callback;
-    tsx->timeout_timer.id = TIMER_INACTIVE;
-    tsx->timeout_timer.user_data = tsx;
-    tsx->timeout_timer.cb = &tsx_timer_callback;
+    pj_timer_entry_init(&tsx->retransmit_timer, TIMER_INACTIVE, tsx, &tsx_timer_callback);
+    pj_timer_entry_init(&tsx->timeout_timer, TIMER_INACTIVE, tsx, &tsx_timer_callback);
     
     if (grp_lock) {
 	tsx->grp_lock = grp_lock;
diff --git a/pjsip/src/pjsip/sip_transport.c b/pjsip/src/pjsip/sip_transport.c
index 17e9142..22f4dc1 100644
--- a/pjsip/src/pjsip/sip_transport.c
+++ b/pjsip/src/pjsip/sip_transport.c
@@ -1139,8 +1139,7 @@ PJ_DEF(pj_status_t) pjsip_transport_register( pjsip_tpmgr *mgr,
     /* Init. */
     tp->tpmgr = mgr;
     pj_bzero(&tp->idle_timer, sizeof(tp->idle_timer));
-    tp->idle_timer.user_data = tp;
-    tp->idle_timer.cb = &transport_idle_callback;
+    pj_timer_entry_init(&tp->idle_timer, 0, tp, &transport_idle_callback);
 
     /* 
      * Register to hash table (see Trac ticket #42).
-- 
2.7.4