s_mysql_mysql_thd_store Struct Reference

A service to store an opaque pointer in MYSQL_THD. More...

#include <mysql_thd_store_service.h>

Public Attributes
mysql_service_status_t(*	register_slot )(const char *name, free_resource_fn free_fn, mysql_thd_store_slot *slot)
	Register a slot to store data specific to a component. More...
mysql_service_status_t(*	unregister_slot )(mysql_thd_store_slot slot)
	Unregister a slot. More...
mysql_service_status_t(*	set )(THD *thd, mysql_thd_store_slot slot, void *object)
	Set/Reset an opaque pointer in thd store. More...
void *(*	get )(THD *thd, mysql_thd_store_slot slot)
	Get handle to an already stored object. More...

Detailed Description

A service to store an opaque pointer in MYSQL_THD.

Member Data Documentation

get

void *(* s_mysql_mysql_thd_store::get) (THD *thd, mysql_thd_store_slot slot)

Get handle to an already stored object.

Parameters

[in]	thd	Session handle. If NULL, current session will be used.
[in]	slot	Key used to identify the object handle

Returns

handle to the object if found, nullptr otherwise

register_slot

mysql_service_status_t(* s_mysql_mysql_thd_store::register_slot) (const char *name, free_resource_fn free_fn, mysql_thd_store_slot *slot)

Register a slot to store data specific to a component.

The free_resource callback is used to free the stored pointer before thd is destroyed

Parameters

[in]	name	Implementation name
[in]	free_fn	Callback to free resource stored in the slot
[out]	slot	Key used to identify the object handle

Returns

status of registration

Return values

false	Success
true	Error. This typically means all slots are full

set

mysql_service_status_t(* s_mysql_mysql_thd_store::set) (THD *thd, mysql_thd_store_slot slot, void *object)

Set/Reset an opaque pointer in thd store.

Parameters

[in]	thd	Session handle. If NULL, current session will be used.
[in]	slot	Key used to identify the object handle
[in]	object	Handle of the object being stored. If NULL, it will be considered removal.

Returns

Status of the operation

Return values

false	Success
true	Error

unregister_slot

mysql_service_status_t(* s_mysql_mysql_thd_store::unregister_slot) (mysql_thd_store_slot slot)

Unregister a slot.

Parameters

[in,out]

slot

Key allocated to component

Returns

status of operation

Return values

false	Success
true	Error

---

The documentation for this struct was generated from the following file:

• include/mysql/components/services/mysql_thd_store_service.h