class MonoLogger

Create an instance.

=== Description

Maximum logfile size (only applies when +shift_age+ is a number).
+shift_size+::
+weekly+ or +monthly+).
Number of old log files to keep, *or* frequency of rotation (+daily+,
+shift_age+::
+STDOUT+, +STDERR+, or an open file).
The log device. This is a filename (String) or IO object (typically
+logdev+::

=== Args

Logger.new(name, shift_age = 'weekly')
Logger.new(name, shift_age = 7, shift_size = 1048576)

=== Synopsis

def initialize(logdev)
  @progname = nil
  @level = DEBUG
  @default_formatter = Formatter.new
  @formatter = nil
  @logdev = nil
  if logdev
    @logdev = LocklessLogDevice.new(logdev)
  end
end