Java multithreading, capture updated boolean variables [duplicate]

Question

I want to do something like this

while (true) {
    if (my_boolean) {  //my_boolean is being updated by other threads
        do something;
        break;
    }
    do something else;
}

my problem is, my_boolean is being updated by another method in another thread. Sometimes such updates can be captured, sometimes not. Is there any consistent way to work around this?

Downvoted. Check any java multithreading tutorial. Or search in StackOverflow before posting a question. This has been asked many times. — Mario Codes
– Mario Codes, Commented Sep 3, 2020 at 10:29

Dorian Gray · Accepted Answer · 2020-09-02 16:24:48Z

1

You can declare that boolean as volatile.

edited Sep 2, 2020 at 16:24

answered Sep 2, 2020 at 15:32

Dorian Gray

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3 Comments

Andy Turner Over a year ago

You don't have to. There are other ways to achieve the same effect.

Alex R Over a year ago

This might also lead to a race condition if there are multiple threads that write that variable.

Dorian Gray Over a year ago

@Andy Turner: I don't see your point. I didn't say that my solution is the only possible one. Okay, the word "must" might get misunderstood.

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