ThreadId to Int

[Andrew Martin]

ThreadId has a Show instance that makes uses the FFI to turn a ThreadId to
a CInt:

    instance Show ThreadId where
       showsPrec d t =
            showString "ThreadId " .
            showsPrec d (getThreadId (id2TSO t))

    foreign import ccall unsafe "rts_getThreadId" getThreadId :: ThreadId#
-> CInt

Can getThreadId be exported? This would make it possible to write a
Hashable instance for ThreadId, and it would make it possible to use a
ThreadId to index into an array (with modulus of course).

-Andrew Thaddeus Martin
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