AtomicLong中的incrementAndGet方法线程安全的么

Question

public final long incrementAndGet() {

return unsafe.getAndAddLong(this, valueOffset, 1L) + 1L;

}
AtomicLong源码中的incrementAndGet方,unsafe.getAndAddLong(this, valueOffset, 1L)方法我清楚是线程安全的，但是在+1之后不又是线程不安全了么。这点不是很清楚，请大佬讲解。这个是看java并发编程之美遇到的问题

Comments

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Answer 1

但是在+1之后不又是线程不安全了么

这里的 +1 为什么线程不安全？

Answer 2

Nothing is going in my head.

Comments

I have my doubts on this question. 

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