Description

A way of performing a potentially long-running operation in a thread, and terminating it‘s execution if it hasn‘t finished within fixed amount of time.

Previous versions of timeout didn‘t use a module for namespace. This version provides both Timeout.timeout, and a backwards-compatible timeout.

Synopsis

  require 'timeout'
  status = Timeout::timeout(5) {
    # Something that should be interrupted if it takes too much time...
  }

Methods

timeout

Classes and Modules

Class Timeout::Error

Constants

THIS_FILE	=	/\A#{Regexp.quote(__FILE__)}:/o
CALLER_OFFSET	=	((c = caller[0]) && THIS_FILE =~ c) ? 1 : 0

Public Instance methods

timeout(sec, klass = nil) {|if sec == nil or sec.zero?| ...}

Executes the method‘s block. If the block execution terminates before sec seconds has passed, it returns true. If not, it terminates the execution and raises exception (which defaults to Timeout::Error).

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().

[Source]

# File timeout.rb, line 52
  def timeout(sec, klass = nil)
    return yield if sec == nil or sec.zero?
    raise ThreadError, "timeout within critical session" if Thread.critical
    exception = klass || Class.new(ExitException)
    begin
      x = Thread.current
      y = Thread.start {
        sleep sec
        x.raise exception, "execution expired" if x.alive?
      }
      yield sec
      #    return true
    rescue exception => e
      rej = /\A#{Regexp.quote(__FILE__)}:#{__LINE__-4}\z/o
      (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
    ensure
      y.kill if y and y.alive?
    end
  end