test/tck/ForkJoinPool9Test.java

/*
 * Written by Doug Lea and Martin Buchholz with assistance from
 * members of JCP JSR-166 Expert Group and released to the public
 * domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.util.concurrent.CompletableFuture;

import junit.framework.Test;
import junit.framework.TestSuite;

public class ForkJoinPool9Test extends JSR166TestCase {
    public static void main(String[] args) {
        main(suite(), args);
    }

    public static Test suite() {
        return new TestSuite(ForkJoinPool9Test.class);
    }

    /**
     * Check handling of common pool thread context class loader
     */
    public void testCommonPoolThreadContextClassLoader() throws Throwable {
        if (!testImplementationDetails) return;
        VarHandle CCL =
            MethodHandles.privateLookupIn(Thread.class, MethodHandles.lookup())
            .findVarHandle(Thread.class, "contextClassLoader", ClassLoader.class);
        ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();
        boolean haveSecurityManager = (System.getSecurityManager() != null);
        CompletableFuture.runAsync(
            () -> {
                assertSame(systemClassLoader,
                           Thread.currentThread().getContextClassLoader());
                assertSame(systemClassLoader,
                           CCL.get(Thread.currentThread()));
                if (haveSecurityManager)
                    assertThrows(
                        SecurityException.class,
                        () -> System.getProperty("foo"),
                        () -> Thread.currentThread().setContextClassLoader(null));

                // TODO ?
//                 if (haveSecurityManager
//                     && Thread.currentThread().getClass().getSimpleName()
//                     .equals("InnocuousForkJoinWorkerThread"))
//                     assertThrows(SecurityException.class, /* ?? */);
            }).join();
    }

}
Revision:	1.2
Committed:	Tue Jan 31 01:44:39 2017 UTC (7 years, 3 months ago) by jsr166
Branch:	MAIN
Changes since 1.1:	+12 -1 lines
Log Message:	JDK-8172726: ForkJoin common pool retains a reference to the thread context class loader
#	Content
1	/*
2	* Written by Doug Lea and Martin Buchholz with assistance from
3	* members of JCP JSR-166 Expert Group and released to the public
4	* domain, as explained at
5	* http://creativecommons.org/publicdomain/zero/1.0/
6	*/
7
8	import java.lang.invoke.MethodHandles;
9	import java.lang.invoke.VarHandle;
10	import java.util.concurrent.CompletableFuture;
11
12	import junit.framework.Test;
13	import junit.framework.TestSuite;
14
15	public class ForkJoinPool9Test extends JSR166TestCase {
16	public static void main(String[] args) {
17	main(suite(), args);
18	}
19
20	public static Test suite() {
21	return new TestSuite(ForkJoinPool9Test.class);
22	}
23
24	/**
25	* Check handling of common pool thread context class loader
26	*/
27	public void testCommonPoolThreadContextClassLoader() throws Throwable {
28	if (!testImplementationDetails) return;
29	VarHandle CCL =
30	MethodHandles.privateLookupIn(Thread.class, MethodHandles.lookup())
31	.findVarHandle(Thread.class, "contextClassLoader", ClassLoader.class);
32	ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();
33	boolean haveSecurityManager = (System.getSecurityManager() != null);
34	CompletableFuture.runAsync(
35	() -> {
36	assertSame(systemClassLoader,
37	Thread.currentThread().getContextClassLoader());
38	assertSame(systemClassLoader,
39	CCL.get(Thread.currentThread()));
40	if (haveSecurityManager)
41	assertThrows(
42	SecurityException.class,
43	() -> System.getProperty("foo"),
44	() -> Thread.currentThread().setContextClassLoader(null));
45
46	// TODO ?
47	// if (haveSecurityManager
48	// && Thread.currentThread().getClass().getSimpleName()
49	// .equals("InnocuousForkJoinWorkerThread"))
50	// assertThrows(SecurityException.class, /* ?? */);
51	}).join();
52	}
53
54	}