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janet/examples/async-execute.janet

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(defn dowork [name n]
(print name " starting work...")
(os/execute [(dyn :executable) "-e" (string "(os/sleep " n ")")] :p)
(print name " finished work!"))
# Will be done in parallel
(print "starting group A")
(ev/call dowork "A 2" 2)
(ev/call dowork "A 1" 1)
(ev/call dowork "A 3" 3)
(ev/sleep 4)
# Will also be done in parallel
(print "starting group B")
(ev/call dowork "B 2" 2)
(ev/call dowork "B 1" 1)
(ev/call dowork "B 3" 3)
(ev/sleep 4)
(print "all work done")