Haskell platform proposal: the async package

[Bas van Dijk]

Hi Simon,

Nice package!

For completeness sake, shouldn't the package also offer these functions:

* asyncOS
* asyncOn
* asyncWithUnmask
* asyncOnWithUnmask

analogous to the same functions in Control.Concurrent.

I don't know if they will be used a lot but I also added them to the
threads package:

http://hackage.haskell.org/packages/archive/threads/0.5/doc/html/Control-Concurrent-Thread.html

Bas