defaults/apps: added documentation - ranger - mirror of ranger

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author	hut <hut@lavabit.com>	2010-02-15 23:50:07 +0100
committer	hut <hut@lavabit.com>	2010-02-15 23:56:56 +0100
commit	8f50c0045fb1f737c6ef8f99f665adac0915e3a0 (patch)
tree	14b8be2f79df347e593528f369f68666f55974b4 /all_tests.py
parent	0086b834f25578ce74a3d3e16978e4a0b913c9ef (diff)
download	ranger-8f50c0045fb1f737c6ef8f99f665adac0915e3a0.tar.gz

defaults/apps: added documentation

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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-inputs
  # n = 0
  n:char <- copy 0
  {
    done?:bool <- 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-inputs
  {
    # read an integer from the channel
    n:char, eof?:bool, 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
]


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