1class Thread
2  MUTEX_FOR_THREAD_EXCLUSIVE = Mutex.new # :nodoc:
3
4  # call-seq:
5  #    Thread.exclusive { block }   => obj
6  #
7  # Wraps a block in Thread.critical, restoring the original value
8  # upon exit from the critical section, and returns the value of the
9  # block.
10  def self.exclusive
11    MUTEX_FOR_THREAD_EXCLUSIVE.synchronize{
12      yield
13    }
14  end
15end
16