Re: [Haskell-cafe] Problems with Network/MVar

On Tue, Apr 1, 2014 at 1:35 PM, Pierre-Étienne Meunier < pierreetienne.meunier@gmail.com> wrote:

Is this the same as using “bracket accept hClose $ blabla” (modulo correct types)?

Sort of (and you could turn this pattern into a similar combinator), except here you want to accept the socket and hand it off to a child thread. In order to make that pattern safe you have to use mask: foo = mask $ \unmask -> do (s, a, _) <- unmask $ accept sock -- here async exceptions are blocked which gives you time to install a signal -- handler, you only unmask exceptions once the handler is installed forkIOWithUnmask $ \restore -> ((restore $ reply state s a) `catch` handler) `finally` (cleanup s a) -- Gregory Collins