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Edit File : timeout.rb \| Size : 3.16 KB
# Timeout long-running blocks # # == Synopsis # # require 'timeout' # status = Timeout::timeout(5) { # # Something that should be interrupted if it takes more than 5 seconds... # } # # == Description # # Timeout provides a way to auto-terminate a potentially long-running # operation if it hasn't finished in a fixed amount of time. # # Previous versions didn't use a module for namespacing, however # #timeout is provided for backwards compatibility. You # should prefer Timeout#timeout instead. # # == Copyright # # Copyright:: (C) 2000 Network Applied Communication Laboratory, Inc. # Copyright:: (C) 2000 Information-technology Promotion Agency, Japan module Timeout # Raised by Timeout#timeout when the block times out. class Error < RuntimeError end class ExitException < ::Exception # :nodoc: end # :stopdoc: THIS_FILE = /\A#{Regexp.quote(__FILE__)}:/o CALLER_OFFSET = ((c = caller[0]) && THIS_FILE =~ c) ? 1 : 0 # :startdoc: # Perform an operation in a block, raising an error 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. A # value of 0 or +nil+ will execute the block without any timeout. # +klass+:: Exception Class to raise if the block fails to terminate # in +sec+ seconds. Omitting will use the default, Timeout::Error # # 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 <tt>include # Timeout</tt> into your classes so they have a #timeout method, as well as # a module method, so you can call it directly as Timeout.timeout(). 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/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 end end module_function :timeout end # Identical to: # # Timeout::timeout(n, e, &block). # # This method is deprecated and provided only for backwards compatibility. # You should use Timeout#timeout instead. def timeout(n, e = nil, &block) Timeout::timeout(n, e, &block) end # Another name for Timeout::Error, defined for backwards compatibility with # earlier versions of timeout.rb. TimeoutError = Timeout::Error Back

Edit File : timeout.rb | Size : 3.16 KB

# Timeout long-running blocks
#
# == Synopsis
#
#   require 'timeout'
#   status = Timeout::timeout(5) {
#     # Something that should be interrupted if it takes more than 5 seconds...
#   }
#
# == Description
#
# Timeout provides a way to auto-terminate a potentially long-running
# operation if it hasn't finished in a fixed amount of time.
#
# Previous versions didn't use a module for namespacing, however
# #timeout is provided for backwards compatibility.  You
# should prefer Timeout#timeout instead.
#
# == Copyright
#
# Copyright:: (C) 2000  Network Applied Communication Laboratory, Inc.
# Copyright:: (C) 2000  Information-technology Promotion Agency, Japan

module Timeout
  # Raised by Timeout#timeout when the block times out.
  class Error < RuntimeError
  end
  class ExitException < ::Exception # :nodoc:
  end

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

# Perform an operation in a block, raising an error 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. A
  #         value of 0 or +nil+ will execute the block without any timeout.
  # +klass+:: Exception Class to raise if the block fails to terminate
  #           in +sec+ seconds.  Omitting will use the default, Timeout::Error
  #
  # 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 <tt>include
  # Timeout</tt> into your classes so they have a #timeout method, as well as
  # a module method, so you can call it directly as Timeout.timeout().
  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/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
    end
  end

module_function :timeout
end

# Identical to:
#
#   Timeout::timeout(n, e, &block).
#
# This method is deprecated and provided only for backwards compatibility.
# You should use Timeout#timeout instead.
def timeout(n, e = nil, &block)
  Timeout::timeout(n, e, &block)
end

# Another name for Timeout::Error, defined for backwards compatibility with
# earlier versions of timeout.rb.
TimeoutError = Timeout::Error

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