rthrow

Arguments: &optional tag value error-p

When called in the dynamic extent of a remote call, terminate the call and propagate tag and value to the remote caller.

Consequently, tag is a reference in the remote environment. If tag is nil, the remote call is simply terminated without a continuing throw in the remote environment. If tag is non-nil, remote call is terminated and the throw is continued in the remote environment.

An ordinary throw inside a remote call terminates the call but continues the throw in the local environment. The remote caller can determine that a throw happened. The thrown value will appear to be :unwind-protect.

When called in the dynamic extent of a remote call, this function does not return. If rthrow is called outside a remote call, then the effect depends on the error-p argument. When nil, simply return nil, otherwise signal an error.

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

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This page was not revised from the 8.2 page.
Created 2012.5.30.