MDEV-21452: Replace ib_mutex_t with mysql_mutex_t

SHOW ENGINE INNODB MUTEX functionality is completely removed,
as are the InnoDB latching order checks.

We will enforce innodb_fatal_semaphore_wait_threshold
only for dict_sys.mutex and lock_sys.mutex.

dict_sys_t::mutex_lock(): A single entry point for dict_sys.mutex.

lock_sys_t::mutex_lock(): A single entry point for lock_sys.mutex.

FIXME: srv_sys should be removed altogether; it is duplicating tpool
functionality.

fil_crypt_threads_init(): To prevent SAFE_MUTEX warnings, we must
not hold fil_system.mutex.

fil_close_all_files(): To prevent SAFE_MUTEX warnings for
fil_space_destroy_crypt_data(), we must not hold fil_system.mutex
while invoking fil_space_free_low() on a detached tablespace.

1 files changed, 3 insertions, 3 deletions

diff --git a/storage/innobase/include/gis0rtree.ic b/storage/innobase/include/gis0rtree.ic
index 82747bdc95a..cb47c12da80 100644
--- a/storage/innobase/include/gis0rtree.ic
+++ b/storage/innobase/include/gis0rtree.ic
@@ -175,12 +175,12 @@ rtr_get_parent_node(
 		return(NULL);
 	}
 
-	mutex_enter(&btr_cur->rtr_info->rtr_path_mutex);
+	mysql_mutex_lock(&btr_cur->rtr_info->rtr_path_mutex);
 
 	num = btr_cur->rtr_info->parent_path->size();
 
 	if (!num) {
-		mutex_exit(&btr_cur->rtr_info->rtr_path_mutex);
+		mysql_mutex_unlock(&btr_cur->rtr_info->rtr_path_mutex);
 		return(NULL);
 	}
 
@@ -203,7 +203,7 @@ rtr_get_parent_node(
 		}
 	}
 
-	mutex_exit(&btr_cur->rtr_info->rtr_path_mutex);
+	mysql_mutex_unlock(&btr_cur->rtr_info->rtr_path_mutex);
 
 	return(found_node);
 }