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zero(3tcl) zero(3tcl) 





NAME


zero - Create and manipulate zero channels






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.



  

  
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.



  

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








  

    2.2
    Memory channels