活锁（Live Lock）：如果不断有事务申请对数据对象的S锁，而某个数据对象始终被S锁占有，而X锁申请迟迟不能获准。
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Long-live lock 长命锁
Live Lock Screen 动态锁屏界面
Knock Lock Live Wallpaper 动态锁屏壁纸
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Perched alongside locks on some of the prettiest spots on the Thames, many would aspire to live in a lock keepers' cottage.
BBC: Goring Lock
The trust added that high levels of fish live at Caen Hill lock on the Kennet and Avon Canal, so management is required to keep an ecological balance.
BBC: Fire-hit Erewash canal set to be restocked with fish
Turn down the thermostat at home without leaving the office, catch live video of your pets with your smartphone, or lock the back door from the other side of town.
ENGADGET: AT&T to release Digital Life home automation in March
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