'''virtchannel_base''' is a container for many of [Tcllib%|%Tcllib's] the virtual channel packages.



** Bug: Memchan: [[`[fileevent] readable`] **

The following script illustrates a problem with Memchan:  it stops generating
'''readable''' events too early.  The same problem was reported (10 years ago!)
for [memchan].  Maybe it needs to be fixed there, too.

======
#! /bin/env tclsh

package require tcl::chan::events
package require tcl::chan::memchan

proc copied {args} {
        puts $args
        set ::done 1
}

set chan [tcl::chan::memchan]
puts -nonewline $chan [string repeat a 50000]
seek $chan 0 start
set chanout [open zout w]
fcopy $chan $chanout -command copied

vwait ::done
======

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