Multi-thread

1.synchronized & asynchronized

To share final variable in multiple threads, must use synchronized or volatile.

2. mutual exclusion or visibility
mutual exclusion: only one thread can hold a lock at a time.
visibility: make sure the later thread can see the former thread changes to data.

3.Atom
Atom operation might not be thread safe.
thread can save duplicates of variable in itself memory.

124 thoughts

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