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= nng_ctx_open(3)
//
// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
//
// This document is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
== NAME
nng_ctx_open - create context
== SYNOPSIS
[source,c]
----
#include <nng/nng.h>
int nng_ctx_open(nng_ctx *ctxp, nng_socket s);
----
== DESCRIPTION
The `nng_ctx0_open()` function creates a separate ((context)) to be used with
the socket _s_,
and returns it at the location pointed by _ctxp_.
NOTE: Not every protocol supports creation of separate contexts.
Contexts allow the independent and concurrent use of stateful operations
using the same socket.
For example, two different contexts created on a <<nng_rep.7#,_rep_>>
socket can each receive requests, and send replies to them, without any
regard to or interference with each other.
(((raw mode)))
TIP: Using contexts is an excellent way to write simpler concurrent
applications, while retaining the benefits of the protocol-specific
advanced processing, avoiding the need to bypass that with
<<nng.7#raw_mode,raw mode>> sockets.
NOTE: Use of contexts with <<nng.7#raw_mode,raw mode>> sockets is
nonsensical, and not supported.
== RETURN VALUES
This function returns 0 on success, and non-zero otherwise.
== ERRORS
`NNG_ENOMEM`:: Insufficient memory is available.
`NNG_ENOTSUP`:: The protocol does not support separate contexts, or the socket was opened in raw mode.
== SEE ALSO
<<nng_ctx_close.3#,nng_ctx_close(3)>>,
<<nng_ctx_getopt.3#,nng_ctx_getopt(3)>>,
<<nng_ctx_recv.3#,nng_ctx_recv(3)>>,
<<nng_ctx_send.3#,nng_ctx_send(3)>>,
<<nng_ctx_setopt.3#,nng_ctx_setopt(3)>>,
<<nng_strerror.3#,nng_strerror(3)>>,
<<nng_ctx.5#,nng_ctx(5)>>,
<<nng_socket.5#,nng_socket(5)>>,
<<nng_rep.7#,nng_rep(7)>>,
<<nng_req.7#,nng_req(7)>>,
<<nng.7#,nng(7)>>
|
