1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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).
14  *
15  * You should have received a copy of the GNU General Public License version
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
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23 
24 /*
25  * @test
26  * @bug 7091003
27  * @summary ScheduledExecutorService never executes Runnable
28  *          with corePoolSize of zero
29  * @library /test/lib
30  * @author Chris Hegarty
31  */
32 
33 import static java.util.concurrent.TimeUnit.MILLISECONDS;
34 
35 import java.util.concurrent.ScheduledThreadPoolExecutor;
36 import jdk.test.lib.Utils;
37 
38 /**
39  * Verify that tasks can be run even with a core pool size of 0.
40  */
41 public class ZeroCorePoolSize {
42     static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
43 
44     volatile boolean taskRun;
45 
test(String[] args)46     void test(String[] args) throws Throwable {
47 
48         ScheduledThreadPoolExecutor pool = new ScheduledThreadPoolExecutor(0);
49         Runnable task = new Runnable() {
50             public void run() {
51                 taskRun = true;
52             }
53         };
54         check(pool.getCorePoolSize() == 0);
55 
56         pool.schedule(task, 12L, MILLISECONDS);
57 
58         pool.shutdown();
59         check(pool.awaitTermination(LONG_DELAY_MS, MILLISECONDS));
60         check(pool.getCorePoolSize() == 0);
61         check(taskRun);
62     }
63 
64     //--------------------- Infrastructure ---------------------------
65     volatile int passed = 0, failed = 0;
pass()66     void pass() {passed++;}
fail()67     void fail() {failed++; Thread.dumpStack();}
fail(String msg)68     void fail(String msg) {System.err.println(msg); fail();}
unexpected(Throwable t)69     void unexpected(Throwable t) {failed++; t.printStackTrace();}
check(boolean cond)70     void check(boolean cond) {if (cond) pass(); else fail();}
equal(Object x, Object y)71     void equal(Object x, Object y) {
72         if (x == null ? y == null : x.equals(y)) pass();
73         else fail(x + " not equal to " + y);}
main(String[] args)74     public static void main(String[] args) throws Throwable {
75         new ZeroCorePoolSize().instanceMain(args);}
instanceMain(String[] args)76     void instanceMain(String[] args) throws Throwable {
77         try {test(args);} catch (Throwable t) {unexpected(t);}
78         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
79         if (failed > 0) throw new AssertionError("Some tests failed");}
f()80     abstract class F {abstract void f() throws Throwable;}
THROWS(Class<? extends Throwable> k, F... fs)81     void THROWS(Class<? extends Throwable> k, F... fs) {
82         for (F f : fs)
83             try {f.f(); fail("Expected " + k.getName() + " not thrown");}
84             catch (Throwable t) {
85                 if (k.isAssignableFrom(t.getClass())) pass();
86                 else unexpected(t);}}
87 }
88