foedus::storage::masstree::MasstreeStorageControlBlock Struct Reference

Shared data of this storage type. More...

Detailed Description

Shared data of this storage type.

Definition at line 50 of file masstree_storage_pimpl.hpp.

#include <masstree_storage_pimpl.hpp>

Collaboration diagram for foedus::storage::masstree::MasstreeStorageControlBlock:

Public Member Functions
	MasstreeStorageControlBlock ()=delete
	~MasstreeStorageControlBlock ()=delete
bool	exists () const

Public Attributes
soc::SharedMutex	status_mutex_
StorageStatus	status_
	Status of the storage. More...
DualPagePointer	root_page_pointer_
	Points to the root page (or something equivalent). More...
MasstreeMetadata	meta_
	metadata of this storage. More...
bool	first_root_locked_
	Used to synchronize updates to root_page_pointer_. More...

Constructor & Destructor Documentation

foedus::storage::masstree::MasstreeStorageControlBlock::MasstreeStorageControlBlock ( )

delete

foedus::storage::masstree::MasstreeStorageControlBlock::~MasstreeStorageControlBlock ( )

delete

Member Function Documentation

bool foedus::storage::masstree::MasstreeStorageControlBlock::exists ( ) const

inline

Definition at line 55 of file masstree_storage_pimpl.hpp.

References foedus::storage::kExists, foedus::storage::kMarkedForDeath, and status_.

{ return status_ == kExists || status_ == kMarkedForDeath; }

Member Data Documentation

bool foedus::storage::masstree::MasstreeStorageControlBlock::first_root_locked_

Used to synchronize updates to root_page_pointer_.

The only usecase is to grow the root of the first layer. This lock must be one that can be used outside of volatile page, i.e., a dumb spinlock or MCS Lock because we put it in the control block. Locks that require UniversalLockId conversion can't be used here, e.g., the Extended RW Lock. We thus use a very different lock here separate from our main lock/commit protocol.

See also

GrowFirstLayerRoot

Definition at line 88 of file masstree_storage_pimpl.hpp.

MasstreeMetadata foedus::storage::masstree::MasstreeStorageControlBlock::meta_

metadata of this storage.

Definition at line 74 of file masstree_storage_pimpl.hpp.

DualPagePointer foedus::storage::masstree::MasstreeStorageControlBlock::root_page_pointer_

Points to the root page (or something equivalent).

Masstree-specific: Volatile pointer is always active. This is always MasstreeIntermediatePage (a contract only for first layer's root page). When the first layer B-tree grows, this points to a new page. So, this is one of the few page pointers that might be swapped. Transactions thus have to add this to a pointer set even thought they are following a volatile pointer.

Instead, this always points to a root. We don't need "is_root" check in [YANDONG12] and thus doesn't need a parent pointer.

Definition at line 72 of file masstree_storage_pimpl.hpp.

Referenced by foedus::storage::masstree::MasstreePartitioner::design_partition().

StorageStatus foedus::storage::masstree::MasstreeStorageControlBlock::status_

Status of the storage.

Definition at line 59 of file masstree_storage_pimpl.hpp.

Referenced by exists().

soc::SharedMutex foedus::storage::masstree::MasstreeStorageControlBlock::status_mutex_

Definition at line 57 of file masstree_storage_pimpl.hpp.

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

• /home/shino/foedus_code/foedus-core/include/foedus/storage/masstree/masstree_storage_pimpl.hpp