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zero(3tcl) zero(3tcl)

NAME

zero - Create and manipulate zero channels

SYNOPSIS

package require Tcl

package require memchan

zero

DESCRIPTION

The command described here is only available in a not-yet released version 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). Transferring the generated channel between interpreters is possible 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 starvation of other event sources the events raised by this channel type have a configurable delay. This option is set in milliseconds 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>
2.2 Memory channels