PFS_notification_registry Struct Reference

PFS_notification_registry A singly linked list of callback registrations. More...

Public Member Functions
	PFS_notification_registry ()
	~PFS_notification_registry ()
int	add (PFS_notification_node *new_node, bool use_ref_count)
	Add a new registration. More...
int	disable (int handle)
	Disable a node given its handle. More...
PFS_notification_node *	get_first (int event_type)
	Get the first active registration. More...
PFS_notification_node *	get_next (PFS_notification_node *current, int event_type)
	Get the next active registration. More...

Private Attributes
std::atomic< PFS_notification_node * >	m_head
std::atomic< std::uint32_t >	m_count

Static Private Attributes
static const std::uint32_t	REFS_MASK = 0x7FFFFFFF
static const std::uint32_t	FREE_MASK = 0x80000000

Detailed Description

PFS_notification_registry A singly linked list of callback registrations.

Callbacks can be unregistered, although the node is disabled and not removed. Plugins must unregister callbacks before unloading. A reference count ensures that the callback functions remain valid until unregister is complete.

Constructor & Destructor Documentation

PFS_notification_registry()

PFS_notification_registry::PFS_notification_registry ( )

inline

~PFS_notification_registry()

PFS_notification_registry::~PFS_notification_registry ( )

inline

Member Function Documentation

add()

int PFS_notification_registry::add ( PFS_notification_node *  new_node, bool  use_ref_count  )

inline

Add a new registration.

Parameters

new_node	callback registraion node
use_ref_count	true if callbacks can be unregistered

Returns

handle of the node

disable()

int PFS_notification_registry::disable ( int  handle )

inline

Disable a node given its handle.

Parameters

handle

returned by add()

Returns

0 if successful, 1 otherwise

get_first()

PFS_notification_node * PFS_notification_registry::get_first ( int  event_type )

inline

Get the first active registration.

Parameters

event_type

notification event

Returns

callback registration or nullptr

get_next()

PFS_notification_node * PFS_notification_registry::get_next ( PFS_notification_node *  current, int  event_type  )

inline

Get the next active registration.

Parameters

current	node returned from get_first() or get_next()
event_type	notification event

Returns

callback registration or nullptr

Member Data Documentation

FREE_MASK

const std::uint32_t PFS_notification_registry::FREE_MASK = 0x80000000

staticprivate

m_count

std::atomic<std::uint32_t> PFS_notification_registry::m_count

private

m_head

std::atomic<PFS_notification_node *> PFS_notification_registry::m_head

private

REFS_MASK

const std::uint32_t PFS_notification_registry::REFS_MASK = 0x7FFFFFFF

staticprivate

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

• storage/perfschema/service_pfs_notification.cc