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zero: Create and manipulate zero channels


zero - Create and manipulate zero channels
package require Tcl package require memchan zero
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.


memchan, fifo, fifo2, null, random


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


Copyright (c) 2004 Pat Thoyts <patthoyts@users.sourceforge.net> ZERO(3)

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