[concurrency-interest] static initialization and thread safety

Bobrowski, Maciej Maciej.Bobrowski at morganstanley.com
Tue Apr 4 10:49:34 EDT 2017


I was wondering what guarantees there are about non-final fields initialized as part of class initialization. Let's consider


Class Point{

    int x, y;

    public Point(int x, int y) {
         this.x = x;
         this.y = y;
    }
}

Class Init{
    public static Point p = new Point(1,2)
    public static Point p2;

    static {
        p2 = new Point(3 , 4)
        p2.x = 10
    }

}

If I have multiple threads trying to read p and p2, would ALL threads wait until those objects are fully constructed and assigned to corresponding fields (like in final fields case) due to initial;ization semantics, or is that not the case?

Thanks!
Maciej


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