fifo2 man page on Darwin

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fifo2(n)							      fifo2(n)

______________________________________________________________________________

NAME
       fifo2 - Create and manipulate pipe fifo channels

SYNOPSIS
       package require Tcl

       package require memchan

       fifo2

_________________________________________________________________

DESCRIPTION
       The command described here is only available in a not-yet released ver‐
       sion of the package. Use the CVS to get the sources.

       fifo2  creates two stream-oriented in-memory channels and returns their
	      handles  as  a  two-element list. There is no restriction on the
	      ultimate size of the channels, they will always grow as much  as
	      is necessary to accomodate the data written into them.

	      In contrast to the channels generated by fifo a pair of channels
	      created here is connected internally in such  a  way  that  data
	      written  into  one  channel can be read from the other. All data
	      written into them is read in the same  order.  This  also	 means
	      that the two channels of the pair are not seekable.

	      The channels created here can be transfered between interpreters
	      in the same thread and between threads. As both channels in  the
	      pair  can be transfered independently they can be used to create
	      a bidirectional connection between two interpreters.

       Memory channels created by fifo2 provide two  read-only	options	 which
       can be queried via the standard fconfigure command. These are

       -rlength
	      The value of this option is the number of bytes currently avail‐
	      able for reading from the channel.

       -wlength
	      The value of this option is the number of bytes currently	 writ‐
	      ten into the channel.

       Note  that  the two lengths are switched for the channels of a pair. In
       other words, the number of bytes written for one of the channels is the
       number of bytes readable from the other end.

       As  the	channels  generated by fifo2 grow as necessary they are always
       writable. This means that a writable fileevent-handler will  fire  con‐
       tinuously.

       The  channels  are  also readable if they contain more than zero bytes.
       Under this conditions a readable fileevent-handler will	fire  continu‐
       ously.

SEE ALSO
       fifo, memchan, null

KEYWORDS
       channel, fifo, i/o, in-memory channel, memchan, stream

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

Memory channels			      2.2			      fifo2(n)
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