test/loops/Finals.java


public class Finals {
    static int npairs = 2;
    static int iters = 10000000;
    static final int LEN = 4;
    static final Long[] nums = new Long[LEN];
    static volatile boolean done;
    static volatile long total;

    public static void main(String[] args) {
        for (int i = 0; i < LEN; ++i)
            nums[i] = new Long(i+1);
        Thread[] ps = new Thread[npairs];
        Thread[] as = new Reader[npairs];
        for (int i = 0; i < npairs; ++i) {
            ps[i] = new Writer();
            as[i] = new Reader();
        }
        for (int i = 0; i < as.length; ++i) {
            ps[i].start();
            as[i].start();
        }
    }

    static long nextRandom(long seed) { 
        return (seed * 0x5DEECE66DL + 0xBL) & ((1L << 48) - 1);
    }

    static long initialSeed(Object x) {
        return (System.currentTimeMillis() + x.hashCode()) | 1;
    }

    static class Writer extends Thread {
        public void run() {
            long s = initialSeed(this);
            int n = iters;
            while (!done && n-- > 0) {
                int k = (int)(s & (LEN-1));
                int l = (k+1) & (LEN-1);
                nums[k] = new Long(s);
                nums[l] = new Long(s);
                s = nextRandom(s);
                if (s == 0) s = initialSeed(this);
            }
            done = true;
            total += s;
        }
    }

    static class Reader extends Thread {
        public void run() {
            int n = iters;
            long s = initialSeed(this);
            while (s != 0 && n > 0) {
                long nexts = nums[(int)(s & (LEN-1))].longValue();
                if (nexts != s) 
                    --n;
                else if (done)
                    break;
                s = nexts;
            }
            done = true;
            total += s;
            if (s == 0) 
                throw new Error("Saw uninitialized value");
        }
    }
}
Revision:	1.1
Committed:	Mon May 2 19:19:38 2005 UTC (19 years ago) by dl
Branch:	MAIN
Log Message:	Put misc performance tests into CVS
#	User	Rev	Content
1	dl	1.1
2			public class Finals {
3			static int npairs = 2;
4			static int iters = 10000000;
5			static final int LEN = 4;
6			static final Long[] nums = new Long[LEN];
7			static volatile boolean done;
8			static volatile long total;
9
10			public static void main(String[] args) {
11			for (int i = 0; i < LEN; ++i)
12			nums[i] = new Long(i+1);
13			Thread[] ps = new Thread[npairs];
14			Thread[] as = new Reader[npairs];
15			for (int i = 0; i < npairs; ++i) {
16			ps[i] = new Writer();
17			as[i] = new Reader();
18			}
19			for (int i = 0; i < as.length; ++i) {
20			ps[i].start();
21			as[i].start();
22			}
23			}
24
25			static long nextRandom(long seed) {
26			return (seed * 0x5DEECE66DL + 0xBL) & ((1L << 48) - 1);
27			}
28
29			static long initialSeed(Object x) {
30			return (System.currentTimeMillis() + x.hashCode()) \| 1;
31			}
32
33			static class Writer extends Thread {
34			public void run() {
35			long s = initialSeed(this);
36			int n = iters;
37			while (!done && n-- > 0) {
38			int k = (int)(s & (LEN-1));
39			int l = (k+1) & (LEN-1);
40			nums[k] = new Long(s);
41			nums[l] = new Long(s);
42			s = nextRandom(s);
43			if (s == 0) s = initialSeed(this);
44			}
45			done = true;
46			total += s;
47			}
48			}
49
50			static class Reader extends Thread {
51			public void run() {
52			int n = iters;
53			long s = initialSeed(this);
54			while (s != 0 && n > 0) {
55			long nexts = nums[(int)(s & (LEN-1))].longValue();
56			if (nexts != s)
57			--n;
58			else if (done)
59			break;
60			s = nexts;
61			}
62			done = true;
63			total += s;
64			if (s == 0)
65			throw new Error("Saw uninitialized value");
66			}
67			}
68			}