# File lib/system_timer/concurrent_timer_pool.rb, line 45
45:     def next_expired_timer(now_in_seconds_since_epoch)
46:       candidate_timer = next_timer
47:       if SystemTimer.debug_enabled?
48:         puts "Candidate timer at #{now_in_seconds_since_epoch} : " +
49:              candidate_timer.inspect
50:       end
51:       return nil if candidate_timer.nil? || 
52:                     candidate_timer.trigger_time > now_in_seconds_since_epoch
53:       candidate_timer
54:     end