Shared_backup_lock_guard Class Reference

MDL_key::BACKUP_LOCK RAII. More...

#include <sql_backup_lock.h>

Public Types
enum class	Lock_result { not_locked = 0 , locked = 1 , oom = 2 }
	There are three possible results while checking if the instance is locked for backup. More...

Public Member Functions
	Shared_backup_lock_guard (THD *thd)
	Shared_backup_lock_guard (const Shared_backup_lock_guard &o)=delete
	Shared_backup_lock_guard (Shared_backup_lock_guard &&o)=default
Shared_backup_lock_guard &	operator= (const Shared_backup_lock_guard &o)=delete
Shared_backup_lock_guard &	operator= (Shared_backup_lock_guard &&o)=default
	~Shared_backup_lock_guard ()
	operator Lock_result () const

Private Member Functions
Shared_backup_lock_guard::Lock_result	try_acquire_shared_backup_lock (THD *thd, bool for_trx)
	Try to acquire shared backup lock. More...

Private Attributes
Shared_backup_lock_guard::Lock_result	m_lock_state
THD *	m_thd

Detailed Description

MDL_key::BACKUP_LOCK RAII.

Member Enumeration Documentation

Lock_result

enum class Shared_backup_lock_guard::Lock_result

strong

There are three possible results while checking if the instance is locked for backup.

Enumerator
not_locked
locked
oom

Constructor & Destructor Documentation

Shared_backup_lock_guard() [1/3]

Shared_backup_lock_guard::Shared_backup_lock_guard

(

THD *

thd

)

Shared_backup_lock_guard() [2/3]

Shared_backup_lock_guard::Shared_backup_lock_guard ( const Shared_backup_lock_guard &  o )

delete

Shared_backup_lock_guard() [3/3]

Shared_backup_lock_guard::Shared_backup_lock_guard ( Shared_backup_lock_guard &&  o )

default

~Shared_backup_lock_guard()

Shared_backup_lock_guard::~Shared_backup_lock_guard

(

)

Member Function Documentation

operator Lock_result()

Shared_backup_lock_guard::operator Shared_backup_lock_guard::Lock_result

(

)

const

operator=() [1/2]

Shared_backup_lock_guard & Shared_backup_lock_guard::operator= ( const Shared_backup_lock_guard &  o )

delete

operator=() [2/2]

Shared_backup_lock_guard & Shared_backup_lock_guard::operator= ( Shared_backup_lock_guard &&  o )

default

try_acquire_shared_backup_lock()

Shared_backup_lock_guard::Lock_result Shared_backup_lock_guard::try_acquire_shared_backup_lock ( THD *  thd, bool  for_trx  )

private

Try to acquire shared backup lock.

Parameters

[in]	thd	Current thread context
[in]	for_trx	true if MDL duration is MDL_TRANSACTION false if MDL duration is MDL_EXPLICIT

Returns

Operation status.

Return values

Shared_backup_lock_guard::Lock_result::locked	Locked shared BACKUP lock.
Shared_backup_lock_guard::Lock_result::not_locked	Could not lock shared BACKUP lock. Conflicting lock exists.
Shared_backup_lock_guard::Lock_result::oom	Error. Could not lock shared BACKUP lock.

Member Data Documentation

m_lock_state

Shared_backup_lock_guard::Lock_result Shared_backup_lock_guard::m_lock_state

private

m_thd

THD* Shared_backup_lock_guard::m_thd

private

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The documentation for this class was generated from the following files:

• sql/sql_backup_lock.h
• sql/sql_backup_lock.cc