BUG#12578441, reintroduced thd->cleanup() in unlink_thd, removed by mistake,...

BUG#12578441, reintroduced thd->cleanup() in unlink_thd, removed by mistake, added private interface to this function

include/mysql/thread_pool_priv.h

@@ -94,6 +94,8 @@ bool thd_is_connection_alive(THD *thd);
 void close_connection(THD *thd, uint errcode);
 /* End the connection before closing it */
 void end_connection(THD *thd);
+/* Cleanup the THD object */
+void thd_cleanup(THD *thd);
 /* Decrement connection counter */
 void dec_connection_count();
 /* Destroy THD object */

sql/mysqld.cc

@@ -2008,6 +2008,19 @@ extern "C" sig_handler end_thread_signal(int sig __attribute__((unused)))
 }
 
 
+/*
+  Cleanup THD object
+
+  SYNOPSIS
+    thd_cleanup()
+    thd		 Thread handler
+*/
+
+void thd_cleanup(THD *thd)
+{
+  thd->cleanup();
+}
+
 /*
   Decrease number of connections
 
@@ -2054,6 +2067,7 @@ void unlink_thd(THD *thd)
   DBUG_ENTER("unlink_thd");
   DBUG_PRINT("enter", ("thd: 0x%lx", (long) thd));
 
+  thd_cleanup(thd);
   dec_connection_count();
   mysql_mutex_lock(&LOCK_thread_count);
   delete_thd(thd);