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test/jdk/java/lang/Thread/virtual/stress/YieldALot.java

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@@ -1,7 +1,7 @@
  /*
-  * Copyright (c) 2020, 2023, Oracle and/or its affiliates. All rights reserved.
+  * Copyright (c) 2020, 2024, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.

@@ -23,46 +23,47 @@
  
  /*
   * @test
   * @summary Stress test Thread.yield
   * @requires vm.debug != true
-  * @run main YieldALot 350000
+  * @run main YieldALot 500000
   */
  
  /*
   * @test
   * @requires vm.debug == true
   * @run main YieldALot 200000
   */
  
  import java.time.Duration;
+ import java.time.Instant;
  import java.util.concurrent.atomic.AtomicInteger;
  
  public class YieldALot {
  
      public static void main(String[] args) throws Exception {
-         int iterations = 1_000_000;
+         int iterations;
          if (args.length > 0) {
              iterations = Integer.parseInt(args[0]);
+         } else {
+             iterations = 1_000_000;
          }
-         final int ITERATIONS = iterations;
  
          AtomicInteger count = new AtomicInteger();
- 
          Thread thread = Thread.ofVirtual().start(() -> {
-             while (count.incrementAndGet() < ITERATIONS) {
+             while (count.incrementAndGet() < iterations) {
                  Thread.yield();
              }
          });
  
          boolean terminated;
          do {
-             terminated = thread.join(Duration.ofMillis(500));
-             System.out.println(count.get());
+             terminated = thread.join(Duration.ofSeconds(1));
+             System.out.println(Instant.now() + " => " + count.get() + " of " + iterations);
          } while (!terminated);
  
          int countValue = count.get();
-         if (countValue != ITERATIONS) {
-             throw new RuntimeException("count = " + countValue);
+         if (countValue != iterations) {
+             throw new RuntimeException("Thread terminated, count=" + countValue);
          }
      }
  }
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