can you block a thread in GHC by its threadID?

[Volker Stolz]

In local.glasgow-haskell-users, you wrote:
> Ideally I'd like this function:
>    blockThread :: ThreadId -> IO ()
>    unBlockThread :: ThreadId -> IO ()

I should have some bit-rotted patches here for
freezeThread :: ThreadId -> IO ()
thawThread   :: ThreadId -> IO () and a new PrimOp which
allows you to set the next thread to run (at a first glance, at least
I could find the patch for the latter).

Volker
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