NAME

       nng_ctx_open - create context

SYNOPSIS

           #include <nng/nng.h>

           int nng_ctx_open(nng_ctx *ctxp, nng_socket s);

DESCRIPTION

       The nng_ctx_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 rep socket can each receive
       requests, and send replies to them, without any regard to or interference with each other.

       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 raw mode sockets.

           Note
           Use of contexts with 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_getopt(3), nng_ctx_recv(3), nng_ctx_send(3), nng_ctx_setopt(3),
       nng_strerror(3), nng_ctx(5), nng_socket(5), nng_rep(7), nng_req(7), nng(7)

                                            2024-10-11                            NNG_CTX_OPEN(3)