Timeout

Module

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: © 2000 Network Applied Communication Laboratory, Inc.
Copyright: © 2000 Information-technology Promotion Agency, Japan

Constants

VERSION

No documentation available

Class Methods

timeout(sec, klass = nil, message = nil) { |sec| ... }

lib/timeout.rb View on GitHub

          
            # File tmp/rubies/ruby-3.2.0/lib/timeout.rb, line 172
def timeout(sec, klass = nil, message = nil, &block)   #:yield: +sec+
  return yield(sec) if sec == nil or sec.zero?

  message ||= "execution expired"

  if Fiber.respond_to?(:current_scheduler) && (scheduler = Fiber.current_scheduler)&.respond_to?(:timeout_after)
    return scheduler.timeout_after(sec, klass || Error, message, &block)
  end

  Timeout.ensure_timeout_thread_created
  perform = Proc.new do |exc|
    request = Request.new(Thread.current, sec, exc, message)
    QUEUE_MUTEX.synchronize do
      QUEUE << request
      CONDVAR.signal
    end
    begin
      return yield(sec)
    ensure
      request.finished
    end
  end

  if klass
    perform.call(klass)
  else
    backtrace = Error.catch(&perform)
    raise Error, message, backtrace
  end
end

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
message: Error message to raise with Exception Class. Omitting will use the default, “execution expired”

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

The exception thrown to terminate the given block cannot be rescued inside the block unless klass is given explicitly. However, the block can use ensure to prevent the handling of the exception. For that reason, this method cannot be relied on to enforce timeouts for untrusted blocks.

If a scheduler is defined, it will be used to handle the timeout by invoking Scheduler#timeout_after.

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().

Instance Methods

timeout(sec, klass = nil, message = nil) { |sec| ... }

lib/timeout.rb View on GitHub

          
            # File tmp/rubies/ruby-3.2.0/lib/timeout.rb, line 172
def timeout(sec, klass = nil, message = nil, &block)   #:yield: +sec+
  return yield(sec) if sec == nil or sec.zero?

  message ||= "execution expired"

  if Fiber.respond_to?(:current_scheduler) && (scheduler = Fiber.current_scheduler)&.respond_to?(:timeout_after)
    return scheduler.timeout_after(sec, klass || Error, message, &block)
  end

  Timeout.ensure_timeout_thread_created
  perform = Proc.new do |exc|
    request = Request.new(Thread.current, sec, exc, message)
    QUEUE_MUTEX.synchronize do
      QUEUE << request
      CONDVAR.signal
    end
    begin
      return yield(sec)
    ensure
      request.finished
    end
  end

  if klass
    perform.call(klass)
  else
    backtrace = Error.catch(&perform)
    raise Error, message, backtrace
  end
end

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
message: Error message to raise with Exception Class. Omitting will use the default, “execution expired”

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

If a scheduler is defined, it will be used to handle the timeout by invoking Scheduler#timeout_after.