> Other actions such as withLinksDo and forkLinkIO' insert stuff into > threadMap. It can be non-mepty.
Thanks (again), Albert. Later, I found this comment above the
'withLinksDo' function: "It is an error to call this function outside
the main thread, or to call any other functions in this module outside
this function."
Here's the simplest example that doesn't return the exception:
instance Show ThreadId where
show (Tid u) = show . hashUnique $ u
main = do
tid <- C.myThreadId
tid' <- fmap Tid newUnique
modifyMVar_ threadMap $ \tm ->
return $ tm { state = M.singleton tid
$ ThreadState { ident = tid'
, signal = defaultSignal tid
, links = S.empty
, monitors = M.empty
, ownedMons = S.empty } }
myThreadId
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