Created
July 27, 2012 22:17
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| RUN_TIME = 10 | |
| RESCUE_TIME = 3 | |
| TERM_WAIT_TIME = 7 | |
| TERMFILE = "term.txt" | |
| class Job | |
| def self.perform(run_time, rescue_time) | |
| sleep(run_time) | |
| puts "Processed job!" | |
| rescue SignalException => e | |
| sleep rescue_time | |
| File.open(TERMFILE, 'w') do |file| | |
| file.puts "Caught Signal Exception: #{e.message}" | |
| end | |
| end | |
| end | |
| class Worker | |
| def self.work(term_timeout) | |
| @shutdown = false | |
| trap('TERM') do | |
| if @child && !Process.waitpid(@child, Process::WNOHANG) | |
| Process.kill("TERM", @child) | |
| (term_timeout.to_f * 10).round.times do |i| | |
| sleep(0.1) | |
| return if Process.waitpid(@child, Process::WNOHANG) | |
| end | |
| Process.kill("KILL", @child) | |
| end | |
| end | |
| loop do | |
| break if @shutdown | |
| if @child = fork | |
| begin | |
| Process.waitpid(@child) | |
| @shutdown = true | |
| rescue SystemCallError | |
| nil | |
| end | |
| else | |
| trap('TERM', 'DEFAULT') | |
| Job.perform(RUN_TIME, RESCUE_TIME) | |
| @shutdown = true | |
| end | |
| @child = nil | |
| end | |
| end | |
| end | |
| if $0 == __FILE__ | |
| require 'fileutils' | |
| FileUtils.rm(TERMFILE) if File.exists?(TERMFILE) | |
| pid = Kernel.fork do | |
| Worker.work(TERM_WAIT_TIME) | |
| end | |
| sleep(1) | |
| Process.kill("TERM", pid) | |
| Process.waitpid(pid) | |
| if File.exists?(TERMFILE) && File.read(TERMFILE).match(/Caught Signal Exception/) | |
| puts 'SUCCESS!' | |
| else | |
| puts 'FAILURE' | |
| end | |
| end |
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