sql_backup_lock.h File Reference

#include <sys/types.h>
#include "my_sqlcommand.h"
#include "sql/sql_cmd.h"

Go to the source code of this file.

Classes
class	Sql_cmd_lock_instance
	Sql_cmd_lock_instance represents statement LOCK INSTANCE FOR BACKUP. More...
class	Sql_cmd_unlock_instance
	Sql_cmd_unlock_instance represents statement UNLOCK INSTANCE. More...
class	Shared_backup_lock_guard
	MDL_key::BACKUP_LOCK RAII. More...

Functions
bool	acquire_exclusive_backup_lock (THD *thd, unsigned long lock_wait_timeout, bool for_trx)
	Acquire exclusive Backup Lock. More...
bool	acquire_shared_backup_lock (THD *thd, unsigned long lock_wait_timeout, bool for_trx=true)
	Acquire shared Backup Lock. More...
void	release_backup_lock (THD *thd)
	Release Backup Lock if it was acquired. More...

Function Documentation

acquire_exclusive_backup_lock()

bool acquire_exclusive_backup_lock	(	THD *	thd,
		unsigned long	lock_wait_timeout,
		bool	for_trx
	)

Acquire exclusive Backup Lock.

Parameters

[in]	thd	Current thread context
[in]	lock_wait_timeout	How many seconds to wait before timeout.
[in]	for_trx	true if MDL duration is MDL_TRANSACTION false if MDL duration is MDL_EXPLICIT

Returns

Operation status.

Return values

false	Success
true	Failure

acquire_shared_backup_lock()

bool acquire_shared_backup_lock	(	THD *	thd,
		unsigned long	lock_wait_timeout,
		bool	for_trx = true
	)

Acquire shared Backup Lock.

Parameters

[in]	thd	Current thread context
[in]	lock_wait_timeout	How many seconds to wait before timeout.
[in]	for_trx	true if MDL duration is MDL_TRANSACTION false if MDL duration is MDL_EXPLICIT

Returns

Operation status.

Return values

false	Success
true	Failure

release_backup_lock()

void release_backup_lock

(

THD *

thd

)

Release Backup Lock if it was acquired.

Parameters

[in]

thd

Current thread context