Hi Patrick, On Fri, Sep 10, 2010 at 2:02 PM, Patrick LeBoutillier < patrick.leboutillier@gmail.com> wrote:
In order to get better at network programming using haskell, I'd like to try and port it to Haskell, but I can't seem to locate the equivalent to select(2) in Haskell. Perhaps a different idiom is to be used?
GHC uses select/epoll/kqueue internally to multiplex its lightweight threads. When you would use a select loop for handle many connections in one language you would typically launch one thread per connection in Haskell, using forkIO. With the upcoming version GHC can handle 100k+ threads this way. Right now the limit is 1024 simultaneous connections due a hard coded limit in select. You code would look something like this: acceptConnections serverSock = do sock <- accept severSock forkIO $ handleConnection sock acceptConnections serverSock handleConnection sock = do msg <- recv send ... sClose sock I'd recommend using the network-bytestring library which provides more efficient versions of e.g. recv and send. Cheers, Johan