zero(n) 2.2 "Memory channels"
zero - Create and manipulate zero channels
TABLE OF CONTENTS
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
KEYWORDS
COPYRIGHT
package require Tcl
package require memchan
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.
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.
fifo, fifo2, memchan, null, random
channel, i/o, in-memory channel, null, zero
Copyright © 2004 Pat Thoyts <patthoyts@users.sourceforge.net>