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| Allegro CL version 9.0 Unrevised from 8.2 to 9.0. 8.2 version

## *rpc-port*

The value of this variable identifies the default RPC port in the dynamic environment.

The variable is bound explicitly by the macro with-remote-port.

When an in-bound remote call is evaluated, the dynamic environment binds this variable to the port which received the call.

In user programs, it is unwise to bind or assign a value to this variable, whether by let-binding, lambda-binding, or using setf or setq.

An out-bound remote call is identified as a callback when the destination port is eq to the default port, and the default port has not been re-bound to some other port in the dynamic environment.

    (defun remotely-called-function ()
        (let ((in-port *rpc-port*))
          (rcall 'foo)  ;; this is a callback
          (with-remote-port (in-port)
                (rcall 'bar)  ;; this is a callback
                )
          (with-remote-port (other-port)
                (with-remote-port (in-port)
                   (rcall 'bar)  ;; this is NOT a callback
                   )
                )
          (rcall 'bar)  ;; this is a callback
          ))

See also rpc.htm for general information on the Remote Procedure Call utility in Allegro CL.

Copyright (c) 1998-2019, Franz Inc. Oakland, CA., USA. All rights reserved.
This page was not revised from the 8.2 page.
Created 2012.5.30.

|  | ToC | DocOverview | CGDoc | RelNotes | FAQ | Index | PermutedIndex
| Allegro CL version 9.0 Unrevised from 8.2 to 9.0. 8.2 version