class ActiveRecord::ConnectionAdapters::ConnectionPool::ConnectionLeasingQueue

:nodoc:
leased and there is no need to re-enter synchronized block.
@lock as the main pool) so that a returned connection is already
still in queue’s critical section (queue synchronizes with the same
an internal subclass that also .leases returned connections while
Connections must be leased while holding the main pool mutex. This is

def internal_poll(timeout) 

def internal_poll(timeout)
  conn = super
  conn.lease if conn
  conn
end