gistfile1.txt

require 'thread'

m = Mutex.new
c = ConditionVariable.new

th = Thread.new do
  include Vx::Common::Spawn
  spawn "command" do |output|
    if output =~ /regexp/
      m.synchronize { c.signal }
    end
  end
end

m.synchronize do
  c.wait(m)
end