Database.HDBI.DriverUtils

Written by John Goerzen, [e-mail]

Documentation

Utilities for database backend drivers.

Please note: this module is intended for authors of database driver libraries only. Authors of applications using HDBI should use HDBI exclusively.

data ChildList stmt

List of weak pointers to childs with concurrent access

Constructors

ChildList

Fields

clList :: TVar (IntMap (Weak stmt))

clCounter :: TVar Int

Little hackish child counter, need to wait all child finalizers in closeAllChildren

clNextKey :: MVar Int

closeAllChildren :: Statement stmt => ChildList stmt -> IO ()

Close all children. Intended to be called by the disconnect function in Connection.

There may be a potential race condition wherein a call to newSth at the same time as a call to this function may result in the new child not being closed.

addChild :: Statement stmt => ChildList stmt -> stmt -> IO ()

Adds a new child to the existing list. Also takes care of registering a finalizer for it, to remove it from the list when possible.

newChildList :: IO (ChildList stmt)

new empty child list