Less abort_loop references

Removed redundant initialisation in unireg_init(): already done by
mysql_init_variables().

Slave threads already check THD::killed, which eliminates the need to
check abort_loop.

Removed unused wsrep_kill_mysql().

sql/init.cc

@@ -24,7 +24,7 @@
 #include "mariadb.h"
 #include "sql_priv.h"
 #include "init.h"
-#include "mysqld.h"                             // abort_loop, ...
+#include "mysqld.h"
 #include "my_time.h"                            // my_init_time
 #include "unireg.h"                             // SPECIAL_SAME_DB_NAME
 #include <m_ctype.h>
@@ -34,8 +34,6 @@ void unireg_init(ulong options)
   DBUG_ENTER("unireg_init");
 
   error_handler_hook = my_message_stderr;
-  abort_loop=0;
-
   my_disable_async_io=1;		/* aioread is only in shared library */
   wild_many='%'; wild_one='_'; wild_prefix='\\'; /* Change to sql syntax */
 

sql/slave.cc

@@ -510,7 +510,7 @@ handle_slave_background(void *arg __attribute__((unused)))
                     &old_stage);
     for (;;)
     {
-      stop= abort_loop || thd->killed || slave_background_thread_stop;
+      stop= thd->killed || slave_background_thread_stop;
       kill_list= slave_background_kill_list;
       create_list= slave_background_gtid_pos_create_list;
       pending_deletes= slave_background_gtid_pending_delete_flag;
@@ -1474,7 +1474,7 @@ static bool io_slave_killed(Master_info* mi)
   DBUG_ENTER("io_slave_killed");
 
   DBUG_ASSERT(mi->slave_running); // tracking buffer overrun
-  DBUG_RETURN(mi->abort_slave || abort_loop || mi->io_thd->killed);
+  DBUG_RETURN(mi->abort_slave || mi->io_thd->killed);
 }
 
 /**
@@ -1499,7 +1499,7 @@ static bool sql_slave_killed(rpl_group_info *rgi)
 
   DBUG_ASSERT(rli->sql_driver_thd == thd);
   DBUG_ASSERT(rli->slave_running == 1);// tracking buffer overrun
-  if (abort_loop || rli->sql_driver_thd->killed || rli->abort_slave)
+  if (rli->sql_driver_thd->killed || rli->abort_slave)
   {
     /*
       The transaction should always be binlogged if OPTION_KEEP_LOG is

sql/slave.h

@@ -278,7 +278,6 @@ void slave_background_gtid_pos_create_request
         (rpl_slave_state::gtid_pos_table *table_entry);
 void slave_background_gtid_pending_delete_request(void);
 
-extern bool volatile abort_loop;
 extern Master_info *active_mi; /* active_mi for multi-master */
 extern Master_info *default_master_info; /* To replace active_mi */
 extern Master_info_index *master_info_index;

sql/wsrep_mysqld.cc

@@ -2375,22 +2375,6 @@ void wsrep_wait_appliers_close(THD *thd)
   */
 }
 
-void wsrep_kill_mysql(THD *thd)
-{
-  if (mysqld_server_started)
-  {
-    if (!abort_loop)
-    {
-      WSREP_INFO("starting shutdown");
-      kill_mysql(thd);
-    }
-  }
-  else
-  {
-    unireg_abort(1);
-  }
-}
-
 void
 wsrep_last_committed_id(wsrep_gtid_t* gtid)
 {

sql/wsrep_mysqld.h

@@ -195,7 +195,6 @@ extern int  wsrep_wait_committing_connections_close(int wait_time);
 extern void wsrep_close_applier(THD *thd);
 extern void wsrep_wait_appliers_close(THD *thd);
 extern void wsrep_close_applier_threads(int count);
-extern void wsrep_kill_mysql(THD *thd);
 
 
 /* new defines */