Inside 'computeIfAbsent' method of ConcurrentHashMap there is code:
synchronized (r) {
if (casTabAt(tab, i, null, r)) {
...
Why not 'ReentrantLock' ?
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littleAlien
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1What would you gain by using a ReentrantLock? You would have to maintain such a lock for each `r`, instead of relying on the intrinsic lock of `r`, for the same functionality. – JB Nizet Mar 30 '16 at 08:20
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Yes, ReentrantLock should be for every bucket. Why not? – littleAlien Mar 30 '16 at 15:27
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Because it's way more complex than using synchronized, with no added value. – JB Nizet Mar 30 '16 at 15:28