How does compare and swap work?

Question

Java

Explain in a simple way how compare and swap works? Let's say there is a variable that both stream1 and stream2 want to increment. Suppose thread1 entered earlier, do I understand correctly that thread2 can take the expected value while reading the variable by thread1, but before thread1 writes the new value?

Answer 1

Read about the volatile keyword and cache coherence .

Answer 2

read more about the race condition in addition to the advice of colleagues