SSMSP

Classes
class	sm_save_point_t
	A point to which a transaction can roll back. More...

Functions
static rc_t	ss_m::save_work (sm_save_point_t &sp)
	Populate a save point. More...
static rc_t	ss_m::rollback_work (const sm_save_point_t &sp)
	Roll back to a savepoint. More...

Detailed Description

A transaction may perform a partial rollback using savepoints. The transaction populates a savepoint by calling ss_m::save_work, then it may roll back to that point with ss_m::rollback_work. Locks acquired between the save_work and rollback_work are not released.

Function Documentation

rollback_work()

rc_t ss_m::rollback_work ( const sm_save_point_t &  sp )

static

Roll back to a savepoint.

Parameters

[in]

sp

An sm_save_point_t owned by the caller and populated by save_work.

Undo everything that was done from the time save_work was called on this savepoint.

Note

Locks are not freed.

Only one thread may be attached to a transaction when this is called.

save_work()

rc_t ss_m::save_work ( sm_save_point_t &  sp )

static

Populate a save point.

Parameters

[out]

sp

An sm_save_point_t owned by the caller.

Store in sp the needed information to be able to roll back to this point. For use with rollback_work.

Note

Only one thread may be attached to a transaction when this is called.