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.

KEYWORDS

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

COPYRIGHT

Copyright (c) 2004 Pat Thoyts <[email protected]>