lockmgr::TableDataLockMgr Class Reference

Locks protecting table data. Read queries take a read lock, while write queries (update, delete) obtain a write lock. Note that insert queries do not currently take a write lock (to allow concurrent inserts). Instead, insert queries obtain a write lock on the table metadata to allow existing read queries to finish (and block new ones) before flushing the inserted data to disk. More...

#include <LockMgr.h>

Inheritance diagram for lockmgr::TableDataLockMgr:

Collaboration diagram for lockmgr::TableDataLockMgr:

Static Public Member Functions
static TableDataLockMgr &	instance ()
Static Public Member Functions inherited from lockmgr::TableLockMgrImpl< TableDataLockMgr >
static WriteLock	getWriteLockForTable (const Catalog_Namespace::Catalog &cat, const std::string &table_name)
static WriteLock	getWriteLockForTable (const ChunkKey table_key)
static ReadLock	getReadLockForTable (const Catalog_Namespace::Catalog &cat, const std::string &table_name)
static ReadLock	getReadLockForTable (const ChunkKey table_key)

Protected Member Functions
	TableDataLockMgr ()
Protected Member Functions inherited from lockmgr::TableLockMgrImpl< TableDataLockMgr >
	TableLockMgrImpl ()

Additional Inherited Members
Public Member Functions inherited from lockmgr::TableLockMgrImpl< TableDataLockMgr >
MutexType *	getTableMutex (const ChunkKey table_key)
std::set< ChunkKey >	getLockedTables () const
Protected Attributes inherited from lockmgr::TableLockMgrImpl< TableDataLockMgr >
std::mutex	map_mutex_
std::map< ChunkKey, std::unique_ptr< MutexType > >	table_mutex_map_

Detailed Description

Locks protecting table data. Read queries take a read lock, while write queries (update, delete) obtain a write lock. Note that insert queries do not currently take a write lock (to allow concurrent inserts). Instead, insert queries obtain a write lock on the table metadata to allow existing read queries to finish (and block new ones) before flushing the inserted data to disk.

Definition at line 74 of file LockMgr.h.

Constructor & Destructor Documentation

lockmgr::TableDataLockMgr::TableDataLockMgr ( )

inlineprotected

Definition at line 82 of file LockMgr.h.

{}

Member Function Documentation

static TableDataLockMgr& lockmgr::TableDataLockMgr::instance ( )

inlinestatic

Definition at line 76 of file LockMgr.h.

Referenced by DBHandler::execute_rel_alg(), and DBHandler::sql_execute().

                                      {
    static TableDataLockMgr data_lock_mgr;
    return data_lock_mgr;
  }

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

• /home/jenkins-slave/workspace/core-os-doxygen/LockMgr/LockMgr.h