shared lock 同享锁 ; 共用锁定
Shared Reentrant Lock 可重入锁
shared-for-read lock state 共读锁定状态
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The multiple user support is especially handy for tablets like the new Nexus 10, which are much more likely to be shared, and now offer quick and easy user switching right from the lock screen.
ENGADGET: Google bumps Android to 4.2, keeps Jelly Bean moniker HD
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