[zeromq-dev] zmq_poll

Dhammika Pathirana dhammika at gmail.com
Wed May 12 10:32:55 CEST 2010

Hi Serge,

I'm working on an erlang driver, if you're interested check it out.
This is experimental/half-baked code, but most of the basic
functionality is there.


On 5/11/10, Serge Aleynikov <serge at aleynikov.org> wrote:
> Hi,
>  The current design of zmq_poll(3) call assumes the "ownership" of a the
>  event objects such that it'll make the underlying poll call on the
>  number of event objects (i.e. file descriptors or zmq sockets) and block
>  for a specified timeout.
>  When integrating this library with other libraries (such as Erlang VM),
>  they may have their own event loop and facility to add/remove file
>  descriptors along with providing a callback indicating that there's
>  activity on given file descriptors.
>  I'd like to see if the following requirement sounds reasonable.
>  Objective
>  ---------
>  Allow external event loops control ZMQ communications layer.
>  Implementation
>  --------------
>  Add two new functions:
>  int zmq_poll_prepare(pollfd* fds_, zmq_pollitem_t *items_, int nitems_,
>                       int* zmq_signaler_fd_);
>      Initialize the fds_ array of size nitems_ with file
>      descriptors from items_.  If there are ZMQ sockets in the items_
>      array, *zmq_signaler_fd_ will contain the index of the ZMQ signaling
>      fd.  Otherwise *zmq_signaler_fd_ will be set to -1.
>  int zmq_poll_check(pollfd* fd_, zmq_pollitem_t* item_, int event_,
>                     short type_)
>      This function needs to be called after externally detected activity
>      on event_.  fd_ and item_ is the pollfd and zmq_pollitem_t structs
>      corresponding to event_ item.
>      The function will process internal ZMQ commands and update
>      item_->revents corresponding to the type_ of event detected.
>  I'd like to hear your feedback about adding this feature and can provide
>  the implementation if there's interest of including it in the library.
>  Serge
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