The calls to XBroadcaster::lockBroadcast() and
XBroadcaster::unlockBroadcasts() may be
nested and even overlapping, but they must be in pairs. While
there is at least one lock remaining, no broadcasts are
sent to 登録（する）d listeners.
The calls to XBroadcaster::lockBroadcast() and
XBroadcaster::unlockBroadcasts() may be
nested and even overlapping, but they must be in pairs. While
there is at least one lock remaining, no broadcasts are
sent to 登録（する）d listeners.
未解決の broadcasts will be sent すぐに after the last
call to XBroadcaster::lockBroadcast() is matched
by a call to XBroadcaster::unlockBroadcasts().
An 実施 can decide to broadcast all 未解決の notification in
order or （製品，工事材料の）一回分 them in 選び出す／独身 broadcasts.
