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Created August 19, 2016 07:13
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ruby.rb
begin
File.open(PID_FILE, ::File::CREAT | ::File::EXCL | ::File::WRONLY){|f| f.write("#{Process.pid}") }
at_exit { File.delete(PID_FILE) if File.exists?(PID_FILE) }
rescue Errno::EEXIST
check_pid
retry
end
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