zero(n) zero(n)

NAME
       zero - Create and manipulate zero channels

SYNOPSIS
       package require TTccll

       package require mmeemmcchhaann

       zzeerroo


DESCRIPTION
       The command described here is only available in a not-yet released ver-
       sion of the package. Use the CVS to get the sources.

       zzeerroo   creates a zero channel which absorbs everything written into it.
              Reading  from a zero channel will return the requested number of
              null bytes. These channels are essentially Tcl-specific variants
              of  the  zero  device for unixoid operating systems (/dev/zero).
              Transfering the generated channel between interpreters is possi-
              ble but does not make much sense.

OOPPTTIIOONNSS
       Memory channels created by zzeerroo provide one additional option to set or
       query.

       -delay ?milliseconds?
              A zzeerroo channel is always writable and readable. This means  that
              all ffiilleeeevveenntt-handlers will fire continuously.  To avoid starva-
              tion of other event sources the events raised  by  this  channel
              type  have a configurable delay. This option is set in millisec-
              onds and defaults to 5.

SEE ALSO
       fifo, fifo2, memchan, null, random

KKEEYYWWOORRDDSS
       channel, i/o, in-memory channel, null, zero

COPYRIGHT       Copyright (c) 2004 Pat Thoyts 



Memory channels                       2.2                              zero(n)