Class: ConditionVariable

Inherits:
Object show all
Defined in:
lib/phusion_passenger/utils.rb

Instance Method Summary collapse

Instance Method Details

#timed_wait(mutex, secs) ⇒ Object

This is like ConditionVariable.wait(), but allows one to wait a maximum amount of time. Returns true if this condition was signaled, false if a timeout occurred.



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# File 'lib/phusion_passenger/utils.rb', line 874

def timed_wait(mutex, secs)
  ruby_engine = defined?(RUBY_ENGINE) ? RUBY_ENGINE : "ruby"
  if secs > 100000000
    # NOTE: If one calls timeout() on FreeBSD 5 with an
    # argument of more than 100000000, then MRI will become
    # stuck in an infite loop, blocking all threads. It seems
    # that MRI uses select() to implement sleeping.
    # I think that a value of more than 100000000 overflows
    # select()'s data structures, causing it to behave incorrectly.
    # So we just make sure we can't sleep more than 100000000
    # seconds.
    secs = 100000000
  end
  if ruby_engine == "jruby"
    if secs > 0
      return wait(mutex, secs)
    else
      return wait(mutex)
    end
  elsif RUBY_VERSION >= '1.9.2'
    if secs > 0
      t1 = Time.now
      wait(mutex, secs)
      t2 = Time.now
      return t2.to_f - t1.to_f < secs
    else
      wait(mutex)
      return true
    end
  else
    if secs > 0
      Timeout.timeout(secs) do
        wait(mutex)
      end
    else
      wait(mutex)
    end
    return true
  end
rescue Timeout::Error
  return false
end

#timed_wait!(mutex, secs) ⇒ Object

This is like ConditionVariable.wait(), but allows one to wait a maximum amount of time. Raises Timeout::Error if the timeout has elapsed.



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# File 'lib/phusion_passenger/utils.rb', line 919

def timed_wait!(mutex, secs)
  ruby_engine = defined?(RUBY_ENGINE) ? RUBY_ENGINE : "ruby"
  if secs > 100000000
    # See the corresponding note for timed_wait().
    secs = 100000000
  end
  if ruby_engine == "jruby"
    if secs > 0
      if !wait(mutex, secs)
        raise Timeout::Error, "Timeout"
      end
    else
      wait(mutex)
    end
  elsif RUBY_VERSION >= '1.9.2'
    if secs > 0
      t1 = Time.now
      wait(mutex, secs)
      t2 = Time.now
      if t2.to_f - t1.to_f >= secs
        raise Timeout::Error, "Timeout"
      end
    else
      wait(mutex)
    end
  else
    if secs > 0
      Timeout.timeout(secs) do
        wait(mutex)
      end
    else
      wait(mutex)
    end
  end
  return nil
end