diff --git a/exec/ipc.c b/exec/ipc.c
index 3cd04ffc..b9341316 100644
--- a/exec/ipc.c
+++ b/exec/ipc.c
@@ -104,6 +104,10 @@ LOGSYS_DECLARE_SUBSYS ("IPC", LOG_INFO);
 
 static unsigned int g_gid_valid = 0;
 
+static void (*ipc_serialize_lock_fn) (void);
+
+static void (*ipc_serialize_unlock_fn) (void);
+
 DECLARE_LIST_INIT (conn_info_list_head);
 
 struct outq_item {
@@ -224,12 +228,14 @@ static inline int conn_info_destroy (struct conn_info *conn_info)
 		return (0);
 	}
 
+	ipc_serialize_lock_fn();
 	/*
 	 * Retry library exit function if busy
 	 */
 	if (conn_info->state == CONN_STATE_THREAD_DESTROYED) {
 		res = ais_service[conn_info->service]->lib_exit_fn (conn_info);
 		if (res == -1) {
+			ipc_serialize_unlock_fn();
 			return (0);
 		} else {
 			conn_info->state = CONN_STATE_LIB_EXIT_CALLED;
@@ -239,6 +245,7 @@ static inline int conn_info_destroy (struct conn_info *conn_info)
 	pthread_mutex_lock (&conn_info->mutex);
 	if (conn_info->refcount > 0) {
 		pthread_mutex_unlock (&conn_info->mutex);
+		ipc_serialize_unlock_fn();
 		return (0);
 	}
 	list_del (&conn_info->list);
@@ -259,6 +266,7 @@ static inline int conn_info_destroy (struct conn_info *conn_info)
 	}
 	close (conn_info->fd);
 	free (conn_info);
+	ipc_serialize_unlock_fn();
 	return (-1);
 }
 
@@ -315,7 +323,9 @@ retry_semop:
 			(sync_in_process() == 0)));
 
 		if (send_ok) {
+			ipc_serialize_lock_fn();
 			ais_service[conn_info->service]->lib_engine[header->id].lib_handler_fn (conn_info, header);
+			ipc_serialize_unlock_fn();
 		} else {
 			/*
 			 * Overload, tell library to retry
@@ -772,12 +782,19 @@ void message_source_set (
 	source->conn = conn;
 }
 
-void cs_ipc_init (unsigned int gid_valid)
+void cs_ipc_init (
+	unsigned int gid_valid,
+	void (*serialize_lock_fn) (void),
+	void (*serialize_unlock_fn) (void))
 {
 	int libais_server_fd;
 	struct sockaddr_un un_addr;
 	int res;
 
+	ipc_serialize_lock_fn = serialize_lock_fn;
+
+	ipc_serialize_unlock_fn = serialize_unlock_fn;
+
 	/*
 	 * Create socket for libais clients, name socket, listen for connections
 	 */
diff --git a/exec/ipc.h b/exec/ipc.h
index c5aad554..f2499fed 100644
--- a/exec/ipc.h
+++ b/exec/ipc.h
@@ -40,7 +40,10 @@ extern void message_source_set (mar_message_source_t *source, void *conn);
 extern int message_source_is_local (mar_message_source_t *source);
 
 extern void cs_ipc_init (
-	unsigned int gid_valid);
+	unsigned int gid_valid,
+        void (*serialize_lock_fn) (void),
+        void (*serialize_unlock_fn) (void)
+);
 
 extern void *cs_conn_private_data_get (void *conn);
 
diff --git a/exec/main.c b/exec/main.c
index b6d430a5..8449191d 100644
--- a/exec/main.c
+++ b/exec/main.c
@@ -679,7 +679,9 @@ int main (int argc, char **argv)
 
 	corosync_mempool_init ();
 
-	cs_ipc_init (main_config.gid);
+	cs_ipc_init (main_config.gid,
+		serialize_mutex_lock,
+		serialize_mutex_unlock);
 
 	/*
 	 * Start main processing loop