class ActiveRecord::ConnectionAdapters::ConnectionPool::BiasableQueue::BiasedConditionVariable

:nodoc:
:nodoc:
biased to some thread.
Adds the ability to turn a basic fair FIFO queue into one

def broadcast 

def broadcast
  broadcast_on_biased
  @other_cond.broadcast
end

def broadcast_on_biased 

def broadcast_on_biased
  @num_waiting_on_real_cond = 0
  @real_cond.broadcast
end

def initialize(lock, other_cond, preferred_thread)

+signal+ and +wait+ methods are only called while holding a lock
semantics of condition variables guarantee that +broadcast+, +broadcast_on_biased+,
:nodoc:
:nodoc:
biased to some thread.
Adds the ability to turn a basic fair FIFO queue into one 
def initialize(lock, other_cond, preferred_thread)
  @real_cond = lock.new_cond
  @other_cond = other_cond
  @preferred_thread = preferred_thread
  @num_waiting_on_real_cond = 0
end

def signal 

def signal
  if @num_waiting_on_real_cond > 0
    @num_waiting_on_real_cond -= 1
    @real_cond
  else
    @other_cond
  end.signal
end

def wait(timeout) 

def wait(timeout)
  if Thread.current == @preferred_thread
    @num_waiting_on_real_cond += 1
    @real_cond
  else
    @other_cond
  end.wait(timeout)
end