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root/jsr166/jsr166/src/test/loops/ContextSwitchTest.java
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Comparing jsr166/src/test/loops/ContextSwitchTest.java (file contents):
Revision 1.3 by dl, Thu Sep 15 16:55:40 2005 UTC vs.
Revision 1.9 by jsr166, Mon Oct 12 20:16:47 2015 UTC

# Line 1 | Line 1
1   /*
2   * Written by Doug Lea with assistance from members of JCP JSR-166
3   * Expert Group and released to the public domain, as explained at
4 < * http://creativecommons.org/licenses/publicdomain
4 > * http://creativecommons.org/publicdomain/zero/1.0/
5   */
6  
7 + import java.util.*;
8   import java.util.concurrent.*;
8 – import java.util.concurrent.locks.*;
9   import java.util.concurrent.atomic.*;
10 < import java.util.*;
10 > import java.util.concurrent.locks.*;
11  
12   public final class ContextSwitchTest {
13 <    final static int iters = 1000000;
13 >    static final int iters = 1000000;
14      static AtomicReference turn = new AtomicReference();
15      public static void main(String[] args) throws Exception {
16          test();
# Line 31 | Line 31 | public final class ContextSwitchTest {
31          b.join();
32          long endTime = System.nanoTime();
33          int np = a.nparks + b.nparks;
34 <        System.out.println("Average time: " +
34 >        System.out.println("Average time: " +
35                             ((endTime - startTime) / np) +
36                             "ns");
37      }
38  
39      static final class MyThread extends Thread {
40 +
41 +        static {
42 +            // Reduce the risk of rare disastrous classloading in first call to
43 +            // LockSupport.park: https://bugs.openjdk.java.net/browse/JDK-8074773
44 +            Class<?> ensureLoaded = LockSupport.class;
45 +        }
46 +
47          volatile Thread other;
48          volatile int nparks;
49  
50          public void run() {
51              final AtomicReference t = turn;
52              final Thread other = this.other;
53 <            if (turn == null || other == null)
53 >            if (turn == null || other == null)
54                  throw new NullPointerException();
55              int p = 0;
56              for (int i = 0; i < iters; ++i) {
# Line 56 | Line 63 | public final class ContextSwitchTest {
63              LockSupport.unpark(other);
64              nparks = p;
65              System.out.println("parks: " + p);
59 –            
66          }
67      }
68   }
63 –
64 –

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