Contents

module Spruz
  module Once
    include File::Constants

    module_function

    def only_once(lock_filename = nil, locking_constant = nil)
      lock_filename ||= $0
      locking_constant ||= LOCK_EX
      f = File.new(lock_filename, RDONLY)
      f.flock(locking_constant) and yield
    ensure
      if f
        f.flock LOCK_UN
        f.close
      end
    end

    def try_only_once(lock_filename = nil, locking_constant = nil, &block)
      only_once(lock_filename, locking_constant || LOCK_EX | LOCK_NB, &block)
    end
  end
end

Version data entries

17 entries across 17 versions & 1 rubygems

Version	Path
spruz-0.2.13	lib/spruz/once.rb
spruz-0.2.12	lib/spruz/once.rb
spruz-0.2.11	lib/spruz/once.rb
spruz-0.2.10	lib/spruz/once.rb
spruz-0.2.9	lib/spruz/once.rb
spruz-0.2.8	lib/spruz/once.rb
spruz-0.2.7	lib/spruz/once.rb
spruz-0.2.6	lib/spruz/once.rb
spruz-0.2.5	lib/spruz/once.rb
spruz-0.2.2	lib/spruz/once.rb
spruz-0.2.1	lib/spruz/once.rb
spruz-0.2.0	lib/spruz/once.rb
spruz-0.1.5	lib/spruz/once.rb
spruz-0.1.3	lib/spruz/once.rb
spruz-0.1.2	lib/spruz/once.rb
spruz-0.1.1	lib/spruz/once.rb
spruz-0.1.0	lib/spruz/once.rb