Module: Tasks

Defined in:
lib/tasks.rb

Class Method Summary collapse

Class Method Details

.love_pact(master, slave, interval = 2) ⇒ Object 



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# File 'lib/tasks.rb', line 28

def love_pact(master, slave, interval = 2)
  loop {
    Process.kill 0, master
    sleep interval
  }
rescue Errno::ESRCH
  Process.kill "KILL", slave
end

.spawn(cmd) ⇒ Object

Tasks.spawn spawns a new process.

This code is almost equivalent to the following code:

def spawn(*cmd)
  fork { exec(*cmd) }
end

But Tasks.spawn doesn’t use exec() for avoiding making new process.

e.g. spawn(‘sleep 100 | echo’) generates the following two processes:

  • sh -c ‘sleep 100 | echo’

  • sleep 10



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# File 'lib/tasks.rb', line 18

def spawn(cmd)
  a = IO.popen(cmd)
  fork do
    while b = a.gets
      puts b
    end
  end
  a.pid
end