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[colours]
bkgnd=default
titlebar=green
titlebar.text=black
titlebar.brackets=black
titlebar.unencrypted=black
titlebar.encrypted=black
titlebar.untrusted=black
titlebar.trusted=black
titlebar.online=black
titlebar.offline=black
titlebar.away=black
titlebar.chat=black
titlebar.dnd=black
titlebar.xa=black
statusbar=green
statusbar.text=black
statusbar.brackets=black
statusbar.active=black
statusbar.new=black
main.text=green
main.text.me=green
main.text.them=green
main.splash=bold_green
main.time=bold_green
input.text=bold_green
subscribed=bold_green
unsubscribed=green
otr.started.trusted=green
otr.started.untrusted=green
otr.ended=green
otr.trusted=green
otr.untrusted=green
online=bold_green
away=green
chat=bold_green
dnd=green
xa=green
offline=green
incoming=bold_green
typing=green
gone=green
error=bold_green
roominfo=green
roommention=bold_green
me=green
them=bold_green
roster.header=bold_green
occupants.header=bold_green
receipt.sent=bold_black
akkartik.com> 2016-09-12 09:22:41 -0700 3339' href='/akkartik/mu/commit/channel.mu?h=hlt&id=ee72abae2159ad741087e98adeed06b7af1a8a8e'>ee72abae ^
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# example program: communicating between routines using channels

def producer sink:&:sink:char -> sink:&:sink:char [
  # produce characters 1 to 5 on a channel
  local-scope
  load-ingredients
  # n = 0
  n:char <- copy 0
  {
    done?:boolean <- lesser-than n, 5
    break-unless done?
    # other threads might get between these prints
    $print [produce: ], n, [ 
]
    sink <- write sink, n
    n <- add n, 1
    loop
  }
  close sink
]

def consumer source:&:source:char -> source:&:source:char [
  # consume and print integers from a channel
  local-scope
  load-ingredients
  {
    # read an integer from the channel
    n:char, eof?:boolean, source <- read source
    break-if eof?
    # other threads might get between these prints
    $print [consume: ], n:char, [ 
]
    loop
  }
]

def main [
  local-scope
  source:&:source:char, sink:&:sink:char <- new-channel 3/capacity
  # create two background 'routines' that communicate by a channel
  routine1:num <- start-running producer, sink
  routine2:num <- start-running consumer, source
  wait-for-routine routine1
  wait-for-routine routine2
]