50 lines
1.9 KiB
Forth
50 lines
1.9 KiB
Forth
(function producer [
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; produce numbers 1 to 5 on a channel
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(default-space:space-address <- new space:literal 30:literal)
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(chan:channel-address <- next-input)
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; n = 0
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(n:integer <- copy 0:literal)
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{ begin
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(done?:boolean <- less-than n:integer 5:literal)
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(break-unless done?:boolean)
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; other threads might get between these prints
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($print (("produce: " literal)))
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(print-integer nil:literal/terminal n:integer)
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($print (("\n" literal)))
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; 'box' n into a dynamically typed 'tagged value' because that's what
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; channels take
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(n2:integer <- copy n:integer)
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(n3:tagged-value-address <- init-tagged-value integer:literal n2:integer)
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(chan:channel-address/deref <- write chan:channel-address n3:tagged-value-address/deref)
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(n:integer <- add n:integer 1:literal)
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(loop)
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}
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])
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(function consumer [
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; consume and print integers from a channel
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(default-space:space-address <- new space:literal 30:literal)
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(chan:channel-address <- next-input)
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{ begin
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; read a tagged value from the channel
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(x:tagged-value chan:channel-address/deref <- read chan:channel-address)
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; unbox the tagged value into an integer
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(n2:integer <- maybe-coerce x:tagged-value integer:literal)
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; other threads might get between these prints
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($print (("consume: " literal)))
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(print-integer nil:literal/terminal n2:integer)
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($print (("\n" literal)))
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(loop)
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}
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])
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(function main [
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(default-space:space-address <- new space:literal 30:literal)
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(chan:channel-address <- init-channel 3:literal)
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; create two background 'routines' that communicate by a channel
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(routine1:integer <- fork consumer:fn nil:literal/globals nil:literal/limit chan:channel-address)
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(routine2:integer <- fork producer:fn nil:literal/globals nil:literal/limit chan:channel-address)
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(sleep until-routine-done:literal routine1:integer)
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(sleep until-routine-done:literal routine2:integer)
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])
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