[erlang-questions] Jinterface hanging on send
Wed Dec 8 23:20:40 CET 2010
Alright, I have reproduced it on linux. It seems that I am probably
making inappropriate use of the sockets jinterface uses to communicate with
epmd. But I am surprised that having multiple JVMs running on one machine
breaks it like that. Keep digging.
On Mon, Dec 6, 2010 at 3:44 PM, Alain O'Dea <> wrote:
> On Monday, December 6, 2010, Francis Stephens <>
> > I have a number of Jinterface nodes running on separate JVMs. With fair
> > regularity () they are blocking on calls to
> > OtpMbox.send(OtpPid,OtpErlangObject).
> > Debugging has shown that each of them is blocking on a call to
> > SocketInputStream.read(byte, int, int).
> I'm trying to imagine why OtpMbox.send(OtpPid,OtpErlangObject) would
> ever need to read a socket. Perhaps it needs to consult EPMB to find
> where lookup the receiver for the OtpPid you are sending to.
> Interesting problem. I have been considering Java/Erlang interop for
> several years on and off. I am very I interested to learn the cause of
> the problem you are seeing and how to solve it.
> > It often appears that the hanging processes are trying to send a message
> > each other at the same time. Often killing one of the JVMs that is
> > on a send will release the other one.
> > I am running Erlang version 220.127.116.11 with jinterface 18.104.22.168 running on
> > windows.
> > Has anyone seen this behaviour before? Is it expected behaviour, I was
> > expecting to be able to run several communicating JVMs concurrently.
> > Right-ho, off to read up on socket programming.
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