Thanks, I altered my top level request handler as follows mysmartserver conf h stateProxy = do socket <- bindPort conf
<I added (setSocketOption socket ReuseAddr 1) here> <Should this be added in a comment, or even in function code, in Happstack.Server.SimpleHTTP? What are the tradeoffs, when would you *not* want ot use ReuseAddr?) webserverTid <- forkIO $ simpleHTTPWithSocket socket conf h putStrLn . ( "starting happs server" ++ ) =<< time control <- startSystemState stateProxy -- start the HAppS state system putStrLn . ( "happs state started" ++ ) =<< time waitForTermination killThread webserverTid stateShutdown control I can't replicate the error reliably so I won't know if it actually fixed the problem for a while, therefore just leaving this cookie crumb trail in case others may find it helpful. 2010/2/26 Brandon S. Allbery KF8NH <allb...@ece.cmu.edu>: > On Feb 26, 2010, at 04:28 , Thomas Hartman wrote: >> >> me: Like mightybyte, I run my app in a shell loop that will just >> restart it after a crash. But every once in a while it won't restart >> because of the busy socket and I need to do a manual restart, killing >> multiple processes (usually 2). >> >> the error I get is: >> >> bind: resource busy (Address already in use) > > This is on application restart? It's not out of file descriptors, it's just > the system keeping the socket around (netstat will show it in TIME_WAIT, or > possibly in a shutdown negotiation state such as LAST_ACK, FIN_WAIT, etc. > TCP lacks *reliable* socket shutdown negotiation). > > You want to configure the socket with SO_REUSEADDR before trying to bind it > (setSocketOption socket ReuseAddr 1). > > As to the portable version of sendfile, it's because not all systems offer a > sendfile() system call. Linux and *BSD do, and can use the native > implementation; the portable version emulates sendfile() when it doesn't > exist, at the price of additional CPU usage/system load (sendfile() having > been created specifically to reduce system load in the common case for web > servers). > > -- > brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allb...@kf8nh.com > system administrator [openafs,heimdal,too many hats] allb...@ece.cmu.edu > electrical and computer engineering, carnegie mellon university KF8NH > > > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe