How to make a thread NOT get interrupted by the CPU?

Hello.
Ok, maybe this might sound trivial, or may expose a fundamental lack in my understand of concurrency... But heres my problem.
I have 2 threads running, both of the same type.
After hours of breaking my head, I found out that the reason my program wasnt working is because the CPU was prematurely interrupting one of the threads before it could set a boolean flag to true.
Basically, my question is this...
Is there a way I can somehow enclose some of my code such that the CPU should never interrupt the thread while it is running within that enclosed section.

Hello.
Ok, maybe this might sound trivial, or may expose a
fundamental lack in my understand of concurrency...
But heres my problem.
I think you nailed it there.
If you want to notify another thread that is waiting look at the methods.. wait and notify.
If you need to gaurantee only one thread is running x at one time then use synchronized.

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