mysql-test/include/wait_show_condition.inc:
  Print failing statement if timeout
mysql-test/r/myisam-metadata.result:
  Updated DBUG_SYNC
mysql-test/t/myisam-metadata.test:
  Updated DBUG_SYNC.
  Removed wait_show_condtion, as this is not needed when we use DBUG_SYNC
  This should fix timing issues with the test
mysys/thr_mutex.c:
  Added comments
sql/sql_acl.cc:
  atoi -> atoll()  (Safety)
storage/myisam/ha_myisam.cc:
  Send signal before mi_repair_by_sort.