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Bug #19837 » wait_bug.rb

kjtsanaktsidis (KJ Tsanaktsidis), 08/11/2023 12:53 AM

 
#!/usr/bin/env ruby

# Use a pair of pipes that will make long_pid exit when
# this script exits, to avoid cluttering your computer with
# sleeping ruby processes.

rpipe, wpipe = IO.pipe

long_pid = fork do
puts "long process (#{Process.pid}) starting"
wpipe.close
rpipe.read
puts "long process (#{Process.pid}) exiting"
end
short_pid = fork do
puts "short process (#{Process.pid}) starting"
wpipe.close
sleep 1
puts "short process (#{Process.pid}) exiting"
end

Thread.new do
puts "waiting for long process (#{long_pid}) in thread"
Process.waitpid2 long_pid
end

sleep 0.5
puts "waiting for any process"
wpid, status = Process.waitpid2 -1
puts "waitpid2 returned (#{wpid}, #{status})"
exit! 0
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