exception safe alternatives to QSem, QSemN, and SampleVar - documentation; documentation

 This is an alternative to the deprecated QSem, QSemN, and SampleVar in
 GHC base. Those base modules are not exception safe and can be broken
 by killThread.
 .
 This package provides the documentation for a library for the Haskell
 programming language.
 See http://www.haskell.org/ for more information on Haskell.