zero.3tcl

Langue: en

Version: 2.2 (debian - 07/07/09)

Section: 3 (Bibliothèques de fonctions)

Sommaire

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). Transfering 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

memchan, fifo, fifo2, null, random

KEYWORDS

zero, null, in-memory channel, channel, i/o 
 Copyright (c) 2004 Pat Thoyts <patthoyts@users.sourceforge.net>