On Fri, Mar 14, 2008 at 7:43 AM, Vitaliy Akimov
Rebuilding of the network package with changed safety helped but I don't think this is the solution. BTW accept is declared as safe. What is the reason of declaring recvFrom as unsafe? I think this breaks highly required feature. Apparently it's impossible to make concurrent server for non connection based protocols.
I assume that you're binding the libc function directly here: In that case, you need to have the RTS manage sleeping your thread for you. You should make the socket non-blocking and handle the EAGAIN and EWOULDBLOCK cases by calling threadWaitRead[1] to block the current Haskell thread only, until the fd is readable. Note that threadWaitRead is GHC only. If you download the source to network-bytestring[2], you can see a very similar pattern in the code for send and recv in there. Alternatively, you can use the functions in Network.Socket, which should work fine. [1] http://haskell.org/ghc/docs/latest/html/libraries/base/Control-Concurrent.ht... [2] http://hackage.haskell.org/cgi-bin/hackage-scripts/package/network-bytestrin... -- Adam Langley agl@imperialviolet.org http://www.imperialviolet.org