010dbe3c73
Motivation: A FastThreadLocal instance currently occupies 2 slots of InternalThreadLocalMap of every thread. Actually for a FastThreadLocalThread, it does not need to store cleaner flags of FastThreadLocal instances. Besides, using BitSet to store cleaner flags is also better for space usage. Modification: Use BitSet to optimize space usage of FastThreadLocal. Result: Avoid unnecessary slot occupancy. Cleaner flags are now stored into a BitSet. |
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