1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
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23 
24 /**
25  * @test
26  * @summary Test user threads with various stack sizes.
27  * @run main/othervm TestThreadStackSizes
28  */
29 
30 public class TestThreadStackSizes extends Thread {
31     static final int K = 1024;
32 
TestThreadStackSizes(long stackSize)33     public TestThreadStackSizes(long stackSize) {
34         super(null, null, "TestThreadStackSizes" + stackSize, stackSize);
35     }
36 
37     @Override
run()38     public void run() {
39     }
40 
createThread(long stackSize)41     public static void createThread(long stackSize) {
42         System.out.println("StackSize: " + stackSize);
43         try {
44             TestThreadStackSizes testThreadStackSize = new TestThreadStackSizes(stackSize);
45             testThreadStackSize.start();
46             try {
47                 testThreadStackSize.join();
48             } catch (InterruptedException e) {
49                 throw new Error("InterruptedException in main thread", e);
50             }
51         } catch (Error e) {  // we sometimes get OutOfMemoryError for very large stacks
52             System.out.println("Got exception for stack size " + stackSize  + ": " + e);
53         }
54     }
55 
main(String[] args)56     public static void main(String[] args) throws Error {
57         // Try every stack size from 0k to 320k.
58         for (int i = 0; i <= 320; i++) {
59             createThread(i * K);
60         }
61         // Try a few other potentially problematic stack sizes.
62         createThread(500*K);
63         createThread(501*K);
64         createThread(-1);
65         createThread(500*K*K);
66         createThread(9223372036854774784L);
67     }
68 }
69