A monitor that will permit dependency loading while blocked waiting for the lock.

Methods
M
Instance Public methods
mon_enter()

Enters an exclusive section, but allows dependency loading while blocked

Source: show | on GitHub 

# File activesupport/lib/active_support/concurrency/load_interlock_aware_monitor.rb, line 11
def mon_enter
  mon_try_enter ||
    ActiveSupport::Dependencies.interlock.permit_concurrent_loads { super }
end