zero(n) 2.2 "Memory channels"

NAME

zero - Create and manipulate zero channels

TABLE OF CONTENTS

    TABLE OF CONTENTS
    SYNOPSIS
    DESCRIPTION
    OPTIONS
    SEE ALSO
    KEYWORDS
    COPYRIGHT

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

fifo, fifo2, memchan, null, random

KEYWORDS

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

COPYRIGHT

Copyright © 2004 Pat Thoyts <patthoyts@users.sourceforge.net>