method

timeout

v1_9_3_125 - Show latest stable - 0 notes - Class: Timeout

timeout(sec, klass = nil) public

Perform an operation in a block, timing it out if it takes longer than sec seconds to complete.

sec

Number of seconds to wait for the block to terminate. Any number

may be used, including Floats to specify fractional seconds.

klass

Exception Class to raise if the block fails to terminate

in +sec+ seconds.  Omitting will use the default, Timeout::Error

The block will be executed on another thread and will be given one argument: sec.

Returns the result of the block if the block completed before sec seconds, otherwise throws an exception, based on the value of klass.

Note that this is both a method of module Timeout, so you can include Timeout into your classes so they have a #timeout method, as well as a module method, so you can call it directly as Timeout.timeout().

Show source

# File lib/timeout.rb, line 53
  def timeout(sec, klass = nil)   #:yield: +sec+
    return yield(sec) if sec == nil or sec.zero?
    exception = klass || Class.new(ExitException)
    begin
      begin
        x = Thread.current
        y = Thread.start {
          begin
            sleep sec
          rescue => e
            x.raise e
          else
            x.raise exception, "execution expired"
          end
        }
        return yield(sec)
      ensure
        if y
          y.kill
          y.join # make sure y is dead.
        end
      end
    rescue exception => e
      rej = /\A#{Regexp.quote(__FILE__)}:#{__LINE__-4}\z/
      (bt = e.backtrace).reject! {|m| rej =~ m}
      level = -caller(CALLER_OFFSET).size
      while THIS_FILE =~ bt[level]
        bt.delete_at(level)
        level += 1
      end
      raise if klass            # if exception class is specified, it
                                # would be expected outside.
      raise Error, e.message, e.backtrace
    end
  end

timeout

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