[zeromq-dev] Polling API

gonzalo diethelm gdiethelm at dcv.cl
Fri Apr 9 17:43:09 CEST 2010

> Well, I would say that polling is ripe to get some standardised
> interface. Something like epoll/kqueue.
> There's one provided by Python binding, now there's Java, Lisp copies
> the C interface, not sure about PHP and other languages...
> Thoughts anyone?

To get this discussion going, here is an example of how things work in
Java now:

  // create a 0MQ context that has poll enabled
  ZMQ.Context ctx = ZMQ.context(1, 1, ZMQ.POLL);

  // create two sockets
  ZMQ.Socket spip = ctx.socket(ZMQ.REQ);
  ZMQ.Socket smsg = ctx.socket(ZMQ.PUB);

  // create a poller for two sockets
  ZMQ.Poller poller = ctx.poller(2);

  // configure poller to wait forever

  // will poll for INPUT on socket spip.
  // ip is the index for sockete spip in the poll set.
  int ip = poller.register(spip, ZMQ.POLLIN);

  // will poll for OUTPUT on socket smsg
  // im is the index for sockete smsg in the poll set.
  int im = poller.register(smsg, ZMQ.POLLOUT);

  // loop forever; this loop should have a termination clause!
  while (true) {
      // call poll, possibly block
      long p = poller.poll();

       // poll may have spurious returns
      if (p <= 0)

      // Can we write on smsg? Go ahead.
      if (poller.pollout(im))

      // Can we read on spip? Go ahead.
      if (poller.pollin(ip))

Gonzalo Diethelm

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