On 9 Dec 2004, at 15:30, Michael Walter wrote:
I continued toying with my toy web server, and I'm "sometimes" getting "Invalid argument" errors in hGetLine for a handle I retrieved from Network.listenOn.
My first guess would be that hGetLine would return invalid argument if it was called on a handle which represents a file which is now closed. However, testing in GHCI suggests that returns "illegal operation (handle is closed)". Could be different for network sockets, I suppose.
"Sometimes", because it works fine in the browser, except when I reload very frequently -- maybe it's related to some concurrency issues (I'm using forkIO to spawn off the handler process from the main server loop). When I wanted to benchmark the server using "ab" (Apache Benchmark), it didn't even "survive" one request but Fail'ed using that error message - "<handle: n>: hGetLine: Invalid argument".
I tried adjusting the buffering mode.
Do you have any ideas?
Sounds like a double-close error or something like that. Hard to say without seeing the code. Can you make a minimal example?
Jules
_______________________________________________ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
