test/tck/LockSupportTest.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/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.*;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.LockSupport;
import static java.util.concurrent.TimeUnit.MILLISECONDS;

public class LockSupportTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }

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

    /**
     * Returns the blocker object used by tests in this file.
     * Any old object will do; we'll return a convenient one.
     */
    static Object theBlocker() {
        return LockSupportTest.class;
    }

    enum ParkMethod {
        park() {
            void park() {
                LockSupport.park();
            }
            void park(long millis) {
                throw new UnsupportedOperationException();
            }
        },
        parkUntil() {
            void park(long millis) {
                LockSupport.parkUntil(deadline(millis));
            }
        },
        parkNanos() {
            void park(long millis) {
                LockSupport.parkNanos(MILLISECONDS.toNanos(millis));
            }
        },
        parkBlocker() {
            void park() {
                LockSupport.park(theBlocker());
            }
            void park(long millis) {
                throw new UnsupportedOperationException();
            }
        },
        parkUntilBlocker() {
            void park(long millis) {
                LockSupport.parkUntil(theBlocker(), deadline(millis));
            }
        },
        parkNanosBlocker() {
            void park(long millis) {
                LockSupport.parkNanos(theBlocker(),
                                      MILLISECONDS.toNanos(millis));
            }
        };

        void park() { park(2 * LONG_DELAY_MS); }
        abstract void park(long millis);

        /** Returns a deadline to use with parkUntil. */
        long deadline(long millis) {
            // beware of rounding
            return System.currentTimeMillis() + millis + 1;
        }
    }

    /**
     * park is released by subsequent unpark
     */
    public void testParkBeforeUnpark_park() {
        testParkBeforeUnpark(ParkMethod.park);
    }
    public void testParkBeforeUnpark_parkNanos() {
        testParkBeforeUnpark(ParkMethod.parkNanos);
    }
    public void testParkBeforeUnpark_parkUntil() {
        testParkBeforeUnpark(ParkMethod.parkUntil);
    }
    public void testParkBeforeUnpark_parkBlocker() {
        testParkBeforeUnpark(ParkMethod.parkBlocker);
    }
    public void testParkBeforeUnpark_parkNanosBlocker() {
        testParkBeforeUnpark(ParkMethod.parkNanosBlocker);
    }
    public void testParkBeforeUnpark_parkUntilBlocker() {
        testParkBeforeUnpark(ParkMethod.parkUntilBlocker);
    }
    public void testParkBeforeUnpark(final ParkMethod parkMethod) {
        final CountDownLatch pleaseUnpark = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() {
                pleaseUnpark.countDown();
                parkMethod.park();
            }});

        await(pleaseUnpark);
        LockSupport.unpark(t);
        awaitTermination(t);
    }

    /**
     * park is released by preceding unpark
     */
    public void testParkAfterUnpark_park() {
        testParkAfterUnpark(ParkMethod.park);
    }
    public void testParkAfterUnpark_parkNanos() {
        testParkAfterUnpark(ParkMethod.parkNanos);
    }
    public void testParkAfterUnpark_parkUntil() {
        testParkAfterUnpark(ParkMethod.parkUntil);
    }
    public void testParkAfterUnpark_parkBlocker() {
        testParkAfterUnpark(ParkMethod.parkBlocker);
    }
    public void testParkAfterUnpark_parkNanosBlocker() {
        testParkAfterUnpark(ParkMethod.parkNanosBlocker);
    }
    public void testParkAfterUnpark_parkUntilBlocker() {
        testParkAfterUnpark(ParkMethod.parkUntilBlocker);
    }
    public void testParkAfterUnpark(final ParkMethod parkMethod) {
        final CountDownLatch pleaseUnpark = new CountDownLatch(1);
        final AtomicBoolean pleasePark = new AtomicBoolean(false);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() {
                pleaseUnpark.countDown();
                while (!pleasePark.get())
                    Thread.yield();
                parkMethod.park();
            }});

        await(pleaseUnpark);
        LockSupport.unpark(t);
        pleasePark.set(true);
        awaitTermination(t);
    }

    /**
     * park is released by subsequent interrupt
     */
    public void testParkBeforeInterrupt_park() {
        testParkBeforeInterrupt(ParkMethod.park);
    }
    public void testParkBeforeInterrupt_parkNanos() {
        testParkBeforeInterrupt(ParkMethod.parkNanos);
    }
    public void testParkBeforeInterrupt_parkUntil() {
        testParkBeforeInterrupt(ParkMethod.parkUntil);
    }
    public void testParkBeforeInterrupt_parkBlocker() {
        testParkBeforeInterrupt(ParkMethod.parkBlocker);
    }
    public void testParkBeforeInterrupt_parkNanosBlocker() {
        testParkBeforeInterrupt(ParkMethod.parkNanosBlocker);
    }
    public void testParkBeforeInterrupt_parkUntilBlocker() {
        testParkBeforeInterrupt(ParkMethod.parkUntilBlocker);
    }
    public void testParkBeforeInterrupt(final ParkMethod parkMethod) {
        final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() {
                pleaseInterrupt.countDown();
                do {
                    parkMethod.park();
                    // park may return spuriously
                } while (! Thread.currentThread().isInterrupted());
            }});

        await(pleaseInterrupt);
        assertThreadStaysAlive(t);
        t.interrupt();
        awaitTermination(t);
    }

    /**
     * park is released by preceding interrupt
     */
    public void testParkAfterInterrupt_park() {
        testParkAfterInterrupt(ParkMethod.park);
    }
    public void testParkAfterInterrupt_parkNanos() {
        testParkAfterInterrupt(ParkMethod.parkNanos);
    }
    public void testParkAfterInterrupt_parkUntil() {
        testParkAfterInterrupt(ParkMethod.parkUntil);
    }
    public void testParkAfterInterrupt_parkBlocker() {
        testParkAfterInterrupt(ParkMethod.parkBlocker);
    }
    public void testParkAfterInterrupt_parkNanosBlocker() {
        testParkAfterInterrupt(ParkMethod.parkNanosBlocker);
    }
    public void testParkAfterInterrupt_parkUntilBlocker() {
        testParkAfterInterrupt(ParkMethod.parkUntilBlocker);
    }
    public void testParkAfterInterrupt(final ParkMethod parkMethod) {
        final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
        final AtomicBoolean pleasePark = new AtomicBoolean(false);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() throws Exception {
                pleaseInterrupt.countDown();
                while (!pleasePark.get())
                    Thread.yield();
                assertTrue(Thread.currentThread().isInterrupted());
                parkMethod.park();
                assertTrue(Thread.currentThread().isInterrupted());
            }});

        await(pleaseInterrupt);
        t.interrupt();
        pleasePark.set(true);
        awaitTermination(t);
    }

    /**
     * timed park times out if not unparked
     */
    public void testParkTimesOut_parkNanos() {
        testParkTimesOut(ParkMethod.parkNanos);
    }
    public void testParkTimesOut_parkUntil() {
        testParkTimesOut(ParkMethod.parkUntil);
    }
    public void testParkTimesOut_parkNanosBlocker() {
        testParkTimesOut(ParkMethod.parkNanosBlocker);
    }
    public void testParkTimesOut_parkUntilBlocker() {
        testParkTimesOut(ParkMethod.parkUntilBlocker);
    }
    public void testParkTimesOut(final ParkMethod parkMethod) {
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() {
                for (;;) {
                    long startTime = System.nanoTime();
                    parkMethod.park(timeoutMillis());
                    // park may return spuriously
                    if (millisElapsedSince(startTime) >= timeoutMillis())
                        return;
                }
            }});

        awaitTermination(t);
    }

    /**
     * getBlocker(null) throws NullPointerException
     */
    public void testGetBlockerNull() {
        try {
            LockSupport.getBlocker(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * getBlocker returns the blocker object passed to park
     */
    public void testGetBlocker_parkBlocker() {
        testGetBlocker(ParkMethod.parkBlocker);
    }
    public void testGetBlocker_parkNanosBlocker() {
        testGetBlocker(ParkMethod.parkNanosBlocker);
    }
    public void testGetBlocker_parkUntilBlocker() {
        testGetBlocker(ParkMethod.parkUntilBlocker);
    }
    public void testGetBlocker(final ParkMethod parkMethod) {
        final CountDownLatch started = new CountDownLatch(1);
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() {
                Thread t = Thread.currentThread();
                started.countDown();
                do {
                    assertNull(LockSupport.getBlocker(t));
                    parkMethod.park();
                    assertNull(LockSupport.getBlocker(t));
                    // park may return spuriously
                } while (! Thread.currentThread().isInterrupted());
            }});

        long startTime = System.nanoTime();
        await(started);
        for (;;) {
            Object x = LockSupport.getBlocker(t);
            if (x == theBlocker()) { // success
                t.interrupt();
                awaitTermination(t);
                assertNull(LockSupport.getBlocker(t));
                return;
            } else {
                assertNull(x);  // ok
                if (millisElapsedSince(startTime) > LONG_DELAY_MS)
                    fail("timed out");
                Thread.yield();
            }
        }
    }

    /**
     * timed park(0) returns immediately.
     *
     * Requires hotspot fix for:
     * 6763959 java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever
     * which is in jdk7-b118 and 6u25.
     */
    public void testPark0_parkNanos() {
        testPark0(ParkMethod.parkNanos);
    }
    public void testPark0_parkUntil() {
        testPark0(ParkMethod.parkUntil);
    }
    public void testPark0_parkNanosBlocker() {
        testPark0(ParkMethod.parkNanosBlocker);
    }
    public void testPark0_parkUntilBlocker() {
        testPark0(ParkMethod.parkUntilBlocker);
    }
    public void testPark0(final ParkMethod parkMethod) {
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() {
                parkMethod.park(0L);
            }});

        awaitTermination(t);
    }

    /**
     * timed park(Long.MIN_VALUE) returns immediately.
     */
    public void testParkNeg_parkNanos() {
        testParkNeg(ParkMethod.parkNanos);
    }
    public void testParkNeg_parkUntil() {
        testParkNeg(ParkMethod.parkUntil);
    }
    public void testParkNeg_parkNanosBlocker() {
        testParkNeg(ParkMethod.parkNanosBlocker);
    }
    public void testParkNeg_parkUntilBlocker() {
        testParkNeg(ParkMethod.parkUntilBlocker);
    }
    public void testParkNeg(final ParkMethod parkMethod) {
        Thread t = newStartedThread(new CheckedRunnable() {
            public void realRun() {
                parkMethod.park(Long.MIN_VALUE);
            }});

        awaitTermination(t);
    }
}
Revision:	1.23
Committed:	Sat May 28 22:21:58 2011 UTC (12 years, 11 months ago) by jsr166
Branch:	MAIN
Changes since 1.22:	+255 -246 lines
Log Message:	test blocker methods; extreme refactor
#	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	* Other contributors include Andrew Wright, Jeffrey Hayes,
7	* Pat Fisher, Mike Judd.
8	*/
9
10	import junit.framework.*;
11	import java.util.concurrent.CountDownLatch;
12	import java.util.concurrent.atomic.AtomicBoolean;
13	import java.util.concurrent.locks.LockSupport;
14	import static java.util.concurrent.TimeUnit.MILLISECONDS;
15
16	public class LockSupportTest extends JSR166TestCase {
17	public static void main(String[] args) {
18	junit.textui.TestRunner.run(suite());
19	}
20
21	public static Test suite() {
22	return new TestSuite(LockSupportTest.class);
23	}
24
25	/**
26	* Returns the blocker object used by tests in this file.
27	* Any old object will do; we'll return a convenient one.
28	*/
29	static Object theBlocker() {
30	return LockSupportTest.class;
31	}
32
33	enum ParkMethod {
34	park() {
35	void park() {
36	LockSupport.park();
37	}
38	void park(long millis) {
39	throw new UnsupportedOperationException();
40	}
41	},
42	parkUntil() {
43	void park(long millis) {
44	LockSupport.parkUntil(deadline(millis));
45	}
46	},
47	parkNanos() {
48	void park(long millis) {
49	LockSupport.parkNanos(MILLISECONDS.toNanos(millis));
50	}
51	},
52	parkBlocker() {
53	void park() {
54	LockSupport.park(theBlocker());
55	}
56	void park(long millis) {
57	throw new UnsupportedOperationException();
58	}
59	},
60	parkUntilBlocker() {
61	void park(long millis) {
62	LockSupport.parkUntil(theBlocker(), deadline(millis));
63	}
64	},
65	parkNanosBlocker() {
66	void park(long millis) {
67	LockSupport.parkNanos(theBlocker(),
68	MILLISECONDS.toNanos(millis));
69	}
70	};
71
72	void park() { park(2 * LONG_DELAY_MS); }
73	abstract void park(long millis);
74
75	/** Returns a deadline to use with parkUntil. */
76	long deadline(long millis) {
77	// beware of rounding
78	return System.currentTimeMillis() + millis + 1;
79	}
80	}
81
82	/**
83	* park is released by subsequent unpark
84	*/
85	public void testParkBeforeUnpark_park() {
86	testParkBeforeUnpark(ParkMethod.park);
87	}
88	public void testParkBeforeUnpark_parkNanos() {
89	testParkBeforeUnpark(ParkMethod.parkNanos);
90	}
91	public void testParkBeforeUnpark_parkUntil() {
92	testParkBeforeUnpark(ParkMethod.parkUntil);
93	}
94	public void testParkBeforeUnpark_parkBlocker() {
95	testParkBeforeUnpark(ParkMethod.parkBlocker);
96	}
97	public void testParkBeforeUnpark_parkNanosBlocker() {
98	testParkBeforeUnpark(ParkMethod.parkNanosBlocker);
99	}
100	public void testParkBeforeUnpark_parkUntilBlocker() {
101	testParkBeforeUnpark(ParkMethod.parkUntilBlocker);
102	}
103	public void testParkBeforeUnpark(final ParkMethod parkMethod) {
104	final CountDownLatch pleaseUnpark = new CountDownLatch(1);
105	Thread t = newStartedThread(new CheckedRunnable() {
106	public void realRun() {
107	pleaseUnpark.countDown();
108	parkMethod.park();
109	}});
110
111	await(pleaseUnpark);
112	LockSupport.unpark(t);
113	awaitTermination(t);
114	}
115
116	/**
117	* park is released by preceding unpark
118	*/
119	public void testParkAfterUnpark_park() {
120	testParkAfterUnpark(ParkMethod.park);
121	}
122	public void testParkAfterUnpark_parkNanos() {
123	testParkAfterUnpark(ParkMethod.parkNanos);
124	}
125	public void testParkAfterUnpark_parkUntil() {
126	testParkAfterUnpark(ParkMethod.parkUntil);
127	}
128	public void testParkAfterUnpark_parkBlocker() {
129	testParkAfterUnpark(ParkMethod.parkBlocker);
130	}
131	public void testParkAfterUnpark_parkNanosBlocker() {
132	testParkAfterUnpark(ParkMethod.parkNanosBlocker);
133	}
134	public void testParkAfterUnpark_parkUntilBlocker() {
135	testParkAfterUnpark(ParkMethod.parkUntilBlocker);
136	}
137	public void testParkAfterUnpark(final ParkMethod parkMethod) {
138	final CountDownLatch pleaseUnpark = new CountDownLatch(1);
139	final AtomicBoolean pleasePark = new AtomicBoolean(false);
140	Thread t = newStartedThread(new CheckedRunnable() {
141	public void realRun() {
142	pleaseUnpark.countDown();
143	while (!pleasePark.get())
144	Thread.yield();
145	parkMethod.park();
146	}});
147
148	await(pleaseUnpark);
149	LockSupport.unpark(t);
150	pleasePark.set(true);
151	awaitTermination(t);
152	}
153
154	/**
155	* park is released by subsequent interrupt
156	*/
157	public void testParkBeforeInterrupt_park() {
158	testParkBeforeInterrupt(ParkMethod.park);
159	}
160	public void testParkBeforeInterrupt_parkNanos() {
161	testParkBeforeInterrupt(ParkMethod.parkNanos);
162	}
163	public void testParkBeforeInterrupt_parkUntil() {
164	testParkBeforeInterrupt(ParkMethod.parkUntil);
165	}
166	public void testParkBeforeInterrupt_parkBlocker() {
167	testParkBeforeInterrupt(ParkMethod.parkBlocker);
168	}
169	public void testParkBeforeInterrupt_parkNanosBlocker() {
170	testParkBeforeInterrupt(ParkMethod.parkNanosBlocker);
171	}
172	public void testParkBeforeInterrupt_parkUntilBlocker() {
173	testParkBeforeInterrupt(ParkMethod.parkUntilBlocker);
174	}
175	public void testParkBeforeInterrupt(final ParkMethod parkMethod) {
176	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
177	Thread t = newStartedThread(new CheckedRunnable() {
178	public void realRun() {
179	pleaseInterrupt.countDown();
180	do {
181	parkMethod.park();
182	// park may return spuriously
183	} while (! Thread.currentThread().isInterrupted());
184	}});
185
186	await(pleaseInterrupt);
187	assertThreadStaysAlive(t);
188	t.interrupt();
189	awaitTermination(t);
190	}
191
192	/**
193	* park is released by preceding interrupt
194	*/
195	public void testParkAfterInterrupt_park() {
196	testParkAfterInterrupt(ParkMethod.park);
197	}
198	public void testParkAfterInterrupt_parkNanos() {
199	testParkAfterInterrupt(ParkMethod.parkNanos);
200	}
201	public void testParkAfterInterrupt_parkUntil() {
202	testParkAfterInterrupt(ParkMethod.parkUntil);
203	}
204	public void testParkAfterInterrupt_parkBlocker() {
205	testParkAfterInterrupt(ParkMethod.parkBlocker);
206	}
207	public void testParkAfterInterrupt_parkNanosBlocker() {
208	testParkAfterInterrupt(ParkMethod.parkNanosBlocker);
209	}
210	public void testParkAfterInterrupt_parkUntilBlocker() {
211	testParkAfterInterrupt(ParkMethod.parkUntilBlocker);
212	}
213	public void testParkAfterInterrupt(final ParkMethod parkMethod) {
214	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
215	final AtomicBoolean pleasePark = new AtomicBoolean(false);
216	Thread t = newStartedThread(new CheckedRunnable() {
217	public void realRun() throws Exception {
218	pleaseInterrupt.countDown();
219	while (!pleasePark.get())
220	Thread.yield();
221	assertTrue(Thread.currentThread().isInterrupted());
222	parkMethod.park();
223	assertTrue(Thread.currentThread().isInterrupted());
224	}});
225
226	await(pleaseInterrupt);
227	t.interrupt();
228	pleasePark.set(true);
229	awaitTermination(t);
230	}
231
232	/**
233	* timed park times out if not unparked
234	*/
235	public void testParkTimesOut_parkNanos() {
236	testParkTimesOut(ParkMethod.parkNanos);
237	}
238	public void testParkTimesOut_parkUntil() {
239	testParkTimesOut(ParkMethod.parkUntil);
240	}
241	public void testParkTimesOut_parkNanosBlocker() {
242	testParkTimesOut(ParkMethod.parkNanosBlocker);
243	}
244	public void testParkTimesOut_parkUntilBlocker() {
245	testParkTimesOut(ParkMethod.parkUntilBlocker);
246	}
247	public void testParkTimesOut(final ParkMethod parkMethod) {
248	Thread t = newStartedThread(new CheckedRunnable() {
249	public void realRun() {
250	for (;;) {
251	long startTime = System.nanoTime();
252	parkMethod.park(timeoutMillis());
253	// park may return spuriously
254	if (millisElapsedSince(startTime) >= timeoutMillis())
255	return;
256	}
257	}});
258
259	awaitTermination(t);
260	}
261
262	/**
263	* getBlocker(null) throws NullPointerException
264	*/
265	public void testGetBlockerNull() {
266	try {
267	LockSupport.getBlocker(null);
268	shouldThrow();
269	} catch (NullPointerException success) {}
270	}
271
272	/**
273	* getBlocker returns the blocker object passed to park
274	*/
275	public void testGetBlocker_parkBlocker() {
276	testGetBlocker(ParkMethod.parkBlocker);
277	}
278	public void testGetBlocker_parkNanosBlocker() {
279	testGetBlocker(ParkMethod.parkNanosBlocker);
280	}
281	public void testGetBlocker_parkUntilBlocker() {
282	testGetBlocker(ParkMethod.parkUntilBlocker);
283	}
284	public void testGetBlocker(final ParkMethod parkMethod) {
285	final CountDownLatch started = new CountDownLatch(1);
286	Thread t = newStartedThread(new CheckedRunnable() {
287	public void realRun() {
288	Thread t = Thread.currentThread();
289	started.countDown();
290	do {
291	assertNull(LockSupport.getBlocker(t));
292	parkMethod.park();
293	assertNull(LockSupport.getBlocker(t));
294	// park may return spuriously
295	} while (! Thread.currentThread().isInterrupted());
296	}});
297
298	long startTime = System.nanoTime();
299	await(started);
300	for (;;) {
301	Object x = LockSupport.getBlocker(t);
302	if (x == theBlocker()) { // success
303	t.interrupt();
304	awaitTermination(t);
305	assertNull(LockSupport.getBlocker(t));
306	return;
307	} else {
308	assertNull(x); // ok
309	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
310	fail("timed out");
311	Thread.yield();
312	}
313	}
314	}
315
316	/**
317	* timed park(0) returns immediately.
318	*
319	* Requires hotspot fix for:
320	* 6763959 java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever
321	* which is in jdk7-b118 and 6u25.
322	*/
323	public void testPark0_parkNanos() {
324	testPark0(ParkMethod.parkNanos);
325	}
326	public void testPark0_parkUntil() {
327	testPark0(ParkMethod.parkUntil);
328	}
329	public void testPark0_parkNanosBlocker() {
330	testPark0(ParkMethod.parkNanosBlocker);
331	}
332	public void testPark0_parkUntilBlocker() {
333	testPark0(ParkMethod.parkUntilBlocker);
334	}
335	public void testPark0(final ParkMethod parkMethod) {
336	Thread t = newStartedThread(new CheckedRunnable() {
337	public void realRun() {
338	parkMethod.park(0L);
339	}});
340
341	awaitTermination(t);
342	}
343
344	/**
345	* timed park(Long.MIN_VALUE) returns immediately.
346	*/
347	public void testParkNeg_parkNanos() {
348	testParkNeg(ParkMethod.parkNanos);
349	}
350	public void testParkNeg_parkUntil() {
351	testParkNeg(ParkMethod.parkUntil);
352	}
353	public void testParkNeg_parkNanosBlocker() {
354	testParkNeg(ParkMethod.parkNanosBlocker);
355	}
356	public void testParkNeg_parkUntilBlocker() {
357	testParkNeg(ParkMethod.parkUntilBlocker);
358	}
359	public void testParkNeg(final ParkMethod parkMethod) {
360	Thread t = newStartedThread(new CheckedRunnable() {
361	public void realRun() {
362	parkMethod.park(Long.MIN_VALUE);
363	}});
364
365	awaitTermination(t);
366	}
367	}