Modulerebase-1.21.2Haskell2010

Rebase.Control.Monad.ST.Unsafe

4 values

Packagerebase-1.21.2
Exports4
LanguageHaskell2010
LicenceMIT
SourceIO.hs

valueunsafeIOToST :: IO a -> ST s a

Convert an IO action to an ST action. This relies on IO and ST having the same representation modulo the constraint on the state thread type parameter.

valueunsafeInterleaveST :: ST s a -> ST s a

unsafeInterleaveST allows an ST computation to be deferred lazily. When passed a value of type ST a, the ST computation will only be performed when the value of the a is demanded.

valueunsafeSTToIO :: ST s a -> IO a

Convert an ST action to an IO action. This relies on IO and ST having the same representation modulo the constraint on the state thread type parameter.

For an example demonstrating why this is unsafe, see https://mail.haskell.org/pipermail/haskell-cafe/2009-April/060719.html

valueunsafeDupableInterleaveST :: ST s a -> ST s a

unsafeDupableInterleaveST allows an ST computation to be deferred lazily. When passed a value of type ST a, the ST computation will only be performed when the value of the a is demanded.

The computation may be performed multiple times by different threads, possibly at the same time. To prevent this, use unsafeInterleaveST instead.