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File 3321-erts-Flush-all-signals-on-monitor_nodes-down-signal.patch of Package erlang (Revision b8a244adcb499cf00d0081173f870146)

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From a7cc396f27f8c21363aad712f1758cf7775e1adf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20H=C3=B6gberg?= <john@erlang.org>
Date: Wed, 30 Mar 2022 19:58:43 +0200
Subject: [PATCH] erts: Flush all signals on monitor_nodes down signal

All signals sent prior to the node going down must be delivered
before this one for 'nodedown' to work properly, and conversely
all signals sent afterward must be delivered after for 'nodeup' to
work.
---
 erts/emulator/beam/dist.c               |  8 ++-----
 erts/emulator/beam/erl_proc_sig_queue.c | 32 +++++++++++++++++++++----
 erts/emulator/beam/erl_proc_sig_queue.h | 27 ++++++++++++++-------
 erts/emulator/beam/erl_time_sup.c       | 10 ++++----
 4 files changed, 51 insertions(+), 26 deletions(-)

diff --git a/erts/emulator/beam/dist.c b/erts/emulator/beam/dist.c
index 298ae6ebe2..e321ff99f4 100644
--- a/erts/emulator/beam/dist.c
+++ b/erts/emulator/beam/dist.c
@@ -6460,12 +6460,8 @@ send_nodes_mon_msgs(Process *c_p, Eterm what, Eterm node, Eterm type, Eterm reas
 
         hsz += hp - &tmp_heap[0];
 
-        erts_proc_sig_send_persistent_monitor_msg(ERTS_MON_TYPE_NODES,
-                                                  nmdp[i].options,
-                                                  am_system,
-                                                  nmdp[i].pid,
-                                                  msg,
-                                                  hsz);
+        erts_proc_sig_send_monitor_nodes_msg(nmdp[i].options, nmdp[i].pid,
+                                             msg, hsz);
     }
 
     if (nmdp != &def_buf[0])
diff --git a/erts/emulator/beam/erl_proc_sig_queue.c b/erts/emulator/beam/erl_proc_sig_queue.c
index 78f12d1e8a..f79f6abf16 100644
--- a/erts/emulator/beam/erl_proc_sig_queue.c
+++ b/erts/emulator/beam/erl_proc_sig_queue.c
@@ -1759,12 +1759,17 @@ erts_proc_sig_send_dist_to_alias(Eterm from, Eterm alias,
     }
 }
 
-
-void
+/**
+ * @brief Send a persistent monitor triggered signal to a process.
+ *
+ * Used by monitors that are not auto disabled such as for
+ * example 'time_offset' monitors.
+ */
+static void
 erts_proc_sig_send_persistent_monitor_msg(Uint16 type, Eterm key,
                                           Eterm from, Eterm to,
-                                          Eterm msg, Uint msg_sz)
-{
+                                          Eterm msg, Uint msg_sz,
+                                          int force_flush) {
     ErtsPersistMonMsg *prst_mon;
     ErtsMessage *mp;
     ErlHeapFragment *hfrag;
@@ -1816,13 +1821,30 @@ erts_proc_sig_send_persistent_monitor_msg(Uint16 type, Eterm key,
     ERL_MESSAGE_FROM(mp) = from;
     ERL_MESSAGE_TOKEN(mp) = am_undefined;
 
-    if (!proc_queue_signal(NULL, from, to, (ErtsSignal *) mp, 0,
+    if (!proc_queue_signal(NULL, from, to, (ErtsSignal *) mp, force_flush,
                            ERTS_SIG_Q_OP_PERSISTENT_MON_MSG)) {
         mp->next = NULL;
         erts_cleanup_messages(mp);
     }
 }
 
+void
+erts_proc_sig_send_monitor_nodes_msg(Eterm key, Eterm to,
+                                     Eterm msg, Uint msg_sz) {
+    erts_proc_sig_send_persistent_monitor_msg(ERTS_MON_TYPE_NODES,
+                                              key, am_system, to,
+                                              msg, msg_sz, 1);
+}
+
+void
+erts_proc_sig_send_monitor_time_offset_msg(Eterm key, Eterm to,
+                                           Eterm msg, Uint msg_sz) {
+    erts_proc_sig_send_persistent_monitor_msg(ERTS_MON_TYPE_TIME_OFFSET,
+                                              key, am_clock_service, to,
+                                              msg, msg_sz, 0);
+
+}
+
 static ERTS_INLINE Eterm
 get_persist_mon_msg(ErtsMessage *sig, Eterm *msg)
 {
diff --git a/erts/emulator/beam/erl_proc_sig_queue.h b/erts/emulator/beam/erl_proc_sig_queue.h
index c930f3ce80..bd11c2712e 100644
--- a/erts/emulator/beam/erl_proc_sig_queue.h
+++ b/erts/emulator/beam/erl_proc_sig_queue.h
@@ -755,16 +755,26 @@ erts_proc_sig_send_dist_demonitor(Eterm from, Eterm to, Eterm ref);
 
 /**
  *
- * @brief Send a persistent monitor triggered signal to a process.
+ * @brief Send a persistent "node down" monitor signal to a process
  *
- * Used by monitors that are not auto disabled such as for
- * example 'time_offset' monitors.
+ * @param[in]     key           Monitor key.
  *
- * @param[in]     type          Monitor type.
+ * @param[in]     to            Identifier of receiver.
  *
- * @param[in]     key           Monitor key.
+ * @param[in]     msg           Message template.
  *
- * @param[in]     from          Identifier of sender.
+ * @param[in]     msg_sz        Heap size of message template.
+ *
+ */
+void
+erts_proc_sig_send_monitor_nodes_msg(Eterm key, Eterm to,
+                                     Eterm msg, Uint msg_sz);
+
+/**
+ *
+ * @brief Send a persistent "time offset changed" monitor signal to a process
+ *
+ * @param[in]     key           Monitor key.
  *
  * @param[in]     to            Identifier of receiver.
  *
@@ -774,9 +784,8 @@ erts_proc_sig_send_dist_demonitor(Eterm from, Eterm to, Eterm ref);
  *
  */
 void
-erts_proc_sig_send_persistent_monitor_msg(Uint16 type, Eterm key,
-                                          Eterm from, Eterm to,
-                                          Eterm msg, Uint msg_sz);
+erts_proc_sig_send_monitor_time_offset_msg(Eterm key, Eterm to,
+                                           Eterm msg, Uint msg_sz);
 
 /**
  *
diff --git a/erts/emulator/beam/erl_time_sup.c b/erts/emulator/beam/erl_time_sup.c
index 929df53647..963d40b8b0 100644
--- a/erts/emulator/beam/erl_time_sup.c
+++ b/erts/emulator/beam/erl_time_sup.c
@@ -2018,12 +2018,10 @@ send_time_offset_changed_notifications(void *new_offsetp)
 
 	for (mix = 0; mix < no_monitors; mix++) {
             *patch_refp = to_mon_info[mix].ref;
-            erts_proc_sig_send_persistent_monitor_msg(ERTS_MON_TYPE_TIME_OFFSET,
-                                                      *patch_refp,
-                                                      am_clock_service,
-                                                      to_mon_info[mix].pid,
-                                                      message_template,
-                                                      hsz);
+            erts_proc_sig_send_monitor_time_offset_msg(*patch_refp,
+                                                       to_mon_info[mix].pid,
+                                                       message_template,
+                                                       hsz);
         }
 
 	erts_free(ERTS_ALC_T_TMP, tmp);
-- 
2.34.1

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File 3321-erts-Flush-all-signals-on-monitor_nodes-down-signal.patch of Package erlang (Revision b8a244adcb499cf00d0081173f870146)

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