Proposal: Add forkOSUnmasked to Control.Concurrent

[Edward Kmett]

Joey Adams wrote a request a year or so ago to add forkOSUnmasked to
Control.Concurrent

-- | Like 'forkIOWithUnmask', but the child thread is a bound thread,
as with 'forkOS'.
forkOSWithUnmask :: ((forall a . IO a -> IO a) -> IO ()) -> IO ThreadId
forkOSWithUnmask io = forkOS (io unsafeUnmask)


http://www.haskell.org/pipermail/libraries/2013-June/020271.html

but it received no discussion. (He didn't formally open a discussion period
though).

It has languished as a GHC trac ticket for a year now.

https://ghc.haskell.org/trac/ghc/ticket/8010

Now that we do not have block there are situations where you can need this.

I'm opening this up for bikeshedding.

Thoughts?

Discussion period: 2 weeks.

-Edward
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