ZeroMQ

6.3.90.900

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ZeroMQ

package: zeromq

This package provides a binding for the ZeroMQ library.

This documentation does not describe meaning of API calls; it only describes their Racket calling conventions. For details on API semantics, refer to the documentation at the ZeroMQ site.

zmq_msg_init_data is not supported, because Racket pointers may be moved by the garbage collector before the ZeroMQ library is done with them.

procedure
(context? x) → boolean?
x : any/c

Determines if x is a pointer to a ZeroMQ context.

procedure
(socket? x) → boolean?
x : any/c

Determines if x is a pointer to a ZeroMQ socket.

value
socket-type? : contract?

A contract for the symbols '(PAIR PUB SUB REQ REP DEALER ROUTER XREQ XREP PULL PUSH XPUB XSUB)

value
option-name? : contract?

A contract for the symbols '(AFFINITY IDENTITY SUBSCRIBE UNSUBSCRIBE RATE RECOVERY_IVL MCAST_LOOP SNDBUF RCVBUF RCVMORE SNDHWM RCVHWM)

value
send/recv-flags? : contract?

A contract for any symbol in '(DONTWAIT NOBLOCK SNDMORE) or any list of those symbols.

value
poll-status? : contract?

A contract for any symbol in '(POLLIN POLLOUT POLLERR) or any list of those symbols.

procedure
(msg? x) → boolean?
x : any/c

Determines if x is a ZeroMQ message.

value
_msg : ctype?

A ctype for ZeroMQ messages, suitable for using with malloc.

procedure
(poll-item? x) → boolean?
x : any/c

Determines if x is a ZeroMQ poll item.

procedure
(make-poll-item socket fd events revents) → poll-item?
  socket : socket?
  fd : exact-nonnegative-integer?
  events : poll-status?
  revents : poll-status?

Constructs a poll item for using with poll!.

procedure
(poll-item-revents pi) → poll-status?
pi : poll-item?

Extracts the revents field from a poll item structure.

procedure
(context io_threads) → context?
io_threads : exact-nonnegative-integer?

An FFI binding for zmq_init.

procedure
(context-close! context) → void
context : context?

An FFI binding for zmq_term.

procedure
(call-with-context procedure
[ #:io-threads io-threads]) → void
procedure : (procedure-arity-includes/c 1)
io-threads : exact-nonnegative-integer? = 1

Using the context procedure, call-with-context creates a context and passes it to a procedure with one argument. On return, it closes the context using context-close!

procedure
(msg-init! msg) → void
msg : msg?

An FFI binding for zmq_msg_init.

procedure
(msg-init-size! msg size) → void
msg : msg?
size : exact-nonnegative-integer?

An FFI binding for zmq_msg_init_size.

procedure
(msg-close! msg) → void
msg : msg?

An FFI binding for zmq_msg_close.

procedure
(msg-data-pointer msg) → cpointer?
msg : msg?

An FFI binding for zmq_msg_data.

procedure
(msg-size msg) → exact-nonnegative-integer?
msg : msg?

An FFI binding for zmq_msg_size.

procedure
(msg-data msg) → bytes?
msg : msg?

Creates a sized byte string from a message’s data.

procedure
(make-empty-msg) → msg?

Returns a _msg ctype with no data. The _msg must be manually deallocated using free

procedure
(make-msg-with-data bytes) → msg?
bytes : bytes?

Returns a _msg ctype whose msg-data is set to given the byte string. The _msg must be manually deallocated using free

procedure
(make-msg-with-size exact-nonnegative-integer) → msg?
exact-nonnegative-integer : exact-nonnegative-integer?

Returns a _msg ctype whose size is set the given non-negative integer. The _msg must be manually deallocated using free

procedure
(msg-copy! dest src) → void
dest : msg?
src : msg?

An FFI binding for zmq_msg_copy.

procedure
(msg-move! dest src) → void
dest : msg?
src : msg?

An FFI binding for zmq_msg_move.

procedure
(socket ctxt type) → socket?
ctxt : context?
type : socket-type?

An FFI binding for zmq_socket.

procedure
(socket-close! socket) → void
socket : socket?

An FFI binding for zmq_close.

procedure
(call-with-socket context
socket-type
procedure) → void
  context : context?
  socket-type : socket-type?
  procedure : (procedure-arity-includes/c 1)

Using the socket procedure, call-with-socket creates a socket of a valid socket-type? using a previously created context. It passes the socket to a procedure with one argument. On return, it closes the socket using socket-close!

procedure
(socket-option socket option-name)
→
(or/c

boolean?

exact-integer?

exact-nonnegative-integer?                 bytes?)
  socket : socket?
  option-name : option-name?

Extracts the given option’s value from the socket, similar to zmq_getsockopt.

procedure
(set-socket-option! socket
option-name
option-value) → void
  socket : socket?
  option-name : option-name?
   option-value :
(or/c

exact-nonnegative-integer?

exact-integer?

boolean?                                                     bytes?)

Sets the given option’s value from the socket, similar to zmq_setsockopt.

procedure
(socket-bind! socket endpoint) → void
socket : socket?
endpoint : string?

An FFI binding for zmq_bind.

procedure
(socket-connect! socket endpoint) → void
socket : socket?
endpoint : string?

An FFI binding for zmq_connect.

procedure
(socket-send-msg! msg socket flags) → exact-integer?
  msg : msg?
  socket : socket?
  flags : send/recv-flags?

An FFI binding for zmq_msg_send.

procedure
(socket-send! socket bytes) → void
socket : socket?
bytes : bytes?

Sends a byte string on a socket using socket-send-msg! and a temporary message.

procedure
(socket-recv-msg! msg socket flags) → void
  msg : msg?
  socket : socket?
  flags : send/recv-flags?

An FFI binding for zmq_msg_recv.

procedure
(socket-recv! socket) → bytes?
socket : socket?

Receives a byte string on a socket using socket-recv-msg! and a temporary message.

procedure
(poll! items timeout) → void
items : (vectorof poll-item?)
timeout : exact-integer?

An FFI binding for zmq_poll.

procedure
(proxy! frontend backend [capture]) → void
  frontend : socket?
  backend : socket?
  capture : (or/c socket? false?) = #f

An FFI binding for zmq_proxy. Given two sockets and an optional capture socket, set up a proxy between the frontend socket and the backend socket.

procedure
(zmq-version) →
exact-nonnegative-integer?
exact-nonnegative-integer?
exact-nonnegative-integer?

An FFI binding for zmq_version.

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