waiting-for-input-available

Arguments: (stream-or-fd) &body body

stream-or-fd must be a form evaluating to an input stream or to an integer input-file descriptor.

The forms in the body are evaluated inside an environment that places the file or descriptor on a list of "interesting" objects. If the lisp process executing this form goes into a wait while executing the body, and data becomes available on any of the "interesting" files, the process's wait function will be run to see if the wait has been satisfied. This macro is not required if doing simple lisp reads from a file or socket. Special circumstances are required to make this form necessary in application code.

See multiprocessing.htm for general information on multiprocessing in Allegro CL.

Copyright (c) 1998-2016, Franz Inc. Oakland, CA., USA. All rights reserved.
This page was not revised from the 8.1 page.
Created 2010.1.21.