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# -*- tcl -*-
# # ## ### ##### ######## #############
# (C) 2009 Andreas Kupries
# @@ Meta Begin
# Package tcl::chan::fifo2 1
# Meta as::author {Andreas Kupries}
# Meta as::copyright 2009
# Meta as::license BSD
# Meta as::notes This fifo2 command does not have to
# Meta as::notes deal with the pesky details of
# Meta as::notes threading for cross-thread
# Meta as::notes communication. That is hidden in the
# Meta as::notes implementation of reflected
# Meta as::notes channels. It is less optimal as the
# Meta as::notes command provided by Memchan as this
# Meta as::notes fifo2 may involve three threads when
# Meta as::notes sending data around: The threads the
# Meta as::notes two endpoints are in, and the thread
# Meta as::notes holding this code. Memchan's C
# Meta as::notes implementation does not need this last
# Meta as::notes intermediary thread.
# Meta description Re-implementation of Memchan's fifo2
# Meta description channel. Based on Tcl 8.5's channel
# Meta description reflection support. Exports a single
# Meta description command for the creation of new
# Meta description channels. No arguments. Result are the
# Meta description handles of the two new channels.
# Meta platform tcl
# Meta require TclOO
# Meta require tcl::chan::halfpipe
# Meta require {Tcl 8.5}
# @@ Meta End
# # ## ### ##### ######## #############
package require Tcl 8.5
package require TclOO
package require tcl::chan::halfpipe
# # ## ### ##### ######## #############
namespace eval ::tcl::chan {}
proc ::tcl::chan::fifo2 {} {
set coordinator [fifo2::implementation new]
lassign [halfpipe \
-write-command [list $coordinator froma] \
-close-command [list $coordinator closeda]] \
a ha
lassign [halfpipe \
-write-command [list $coordinator fromb] \
-close-command [list $coordinator closedb]] \
b hb
$coordinator connect $a $ha $b $hb
return [list $a $b]
}
oo::class create ::tcl::chan::fifo2::implementation {
method connect {thea theha theb thehb} {
set a $thea
set b $theb
set ha $theha
set hb $thehb
return
}
method closeda {c} {
set a {}
if {$b ne {}} {
close $b
set b {}
}
my destroy
return
}
method closedb {c} {
set b {}
if {$a ne {}} {
close $a
set a {}
}
my destroy
return
}
method froma {c bytes} {
$hb put $bytes
return
}
method fromb {c bytes} {
$ha put $bytes
return
}
# # ## ### ##### ######## #############
variable a b ha hb
# # ## ### ##### ######## #############
}
# # ## ### ##### ######## #############
package provide tcl::chan::fifo2 1
return
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