zero(n)                                                                zero(n)

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NAME
       zero - Create and manipulate zero channels

SYNOPSIS
       package require Tcl

       package require memchan

       zero

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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.

       zero   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.

OPTIONS
       Memory channels created by zero provide one additional option to set or
       query.

       -delay ?milliseconds?
              A zero channel is always writable and readable. This means  that
              all fileevent-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

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

COPYRIGHT
       Copyright (c) 2004 Pat Thoyts <patthoyts@users.sourceforge.net>

Memory channels                       2.2                              zero(n)