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Man Pages


Manual Reference Pages  -  NULL (n)

NAME

null - Create and manipulate null channels

CONTENTS

Synopsis
Description
Options
Keywords
Copyright

SYNOPSIS

package require Tcl

package require memchan

null


   








\L’|0u-1v’\l’75u+3n_’\L’0u+1v-0u’\l’|0u-1.5n_’



\L’|0u-1v’\L’0u+1v-0u’\l’|0u-1.5n_’





DESCRIPTION

The command described here is only available in a not-yet released version of the package. Use the CVS to get the sources.
null creates a null channel which absorbs everything written into it. Reading from it is not possible, or rather will always return zero bytes. These channels are essentially Tcl-specific variants of the null device for unixoid operating systems (/dev/null). Transferring the generated channel between interpreters is possible but does not make much sense.

OPTIONS

Memory channels created by null provide one additional option to set or query.
-delay ?milliseconds?
  A null 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.

A null channel is always writable and never readable. This means that a writable fileevent-handler will fire continuously and a readable fileevent-handler never at all. The exception to the latter is only the destruction of the channel which will cause the delivery of an eof event to a readable handler.

SEE ALSO

fifo, fifo2, memchan, random, zero

KEYWORDS

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

COPYRIGHT

Copyright (c) 1996-2003 Andreas Kupries <andreas_kupries@users.sourceforge.net>

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Memory channels NULL (n) 2&.2

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