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*
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
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*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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*/
/*
* @test
* @bug 6460501 6236036 6500694 6490770
* @summary Repeated failed timed waits shouldn't leak memory
* @library /lib/testlibrary/
* @author Martin Buchholz
*/
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.Reader;
import java.lang.ref.WeakReference;
import java.util.SplittableRandom;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.Semaphore;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import jdk.testlibrary.Utils;
public class TimedAcquireLeak {
static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
static String javahome() {
String jh = System.getProperty("java.home");
return (jh.endsWith("jre")) ? jh.substring(0, jh.length() - 4) : jh;
}
static final File bin = new File(javahome(), "bin");
static String javaProgramPath(String programName) {
return new File(bin, programName).getPath();
}
static final String java = javaProgramPath("java");
static final String jmap = javaProgramPath("jmap");
static final String jps = javaProgramPath("jps");
static String outputOf(Reader r) throws IOException {
final StringBuilder sb = new StringBuilder();
final char[] buf = new char[1024];
int n;
while ((n = r.read(buf)) > 0)
sb.append(buf, 0, n);
return sb.toString();
}
static String outputOf(InputStream is) throws IOException {
return outputOf(new InputStreamReader(is, "UTF-8"));
}
static final ExecutorService drainers = Executors.newFixedThreadPool(12);
static Future<String> futureOutputOf(final InputStream is) {
return drainers.submit(
new Callable<String>() { public String call() throws IOException {
return outputOf(is); }});}
static String outputOf(final Process p) {
try {
Future<String> outputFuture = futureOutputOf(p.getInputStream());
Future<String> errorFuture = futureOutputOf(p.getErrorStream());
final String output = outputFuture.get();
final String error = errorFuture.get();
// Check for successful process completion
equal(error, "");
equal(p.waitFor(), 0);
equal(p.exitValue(), 0);
return output;
} catch (Throwable t) { unexpected(t); throw new Error(t); }
}
static String commandOutputOf(String... cmd) {
try { return outputOf(new ProcessBuilder(cmd).start()); }
catch (Throwable t) { unexpected(t); throw new Error(t); }
}
// To be called exactly twice by the parent process
static <T> T rendezvousParent(Process p,
Callable<T> callable) throws Throwable {
p.getInputStream().read();
T result = callable.call();
sendByte(p.getOutputStream());
return result;
}
/** No guarantees, but effective in practice. */
private static void forceFullGc() {
CountDownLatch finalizeDone = new CountDownLatch(1);
WeakReference<?> ref = new WeakReference<Object>(new Object() {
protected void finalize() { finalizeDone.countDown(); }});
try {
for (int i = 0; i < 10; i++) {
System.gc();
if (finalizeDone.await(1L, SECONDS) && ref.get() == null) {
System.runFinalization(); // try to pick up stragglers
return;
}
}
} catch (InterruptedException unexpected) {
throw new AssertionError("unexpected InterruptedException");
}
throw new AssertionError("failed to do a \"full\" gc");
}
// To be called exactly twice by the child process
public static void rendezvousChild() {
try {
forceFullGc();
sendByte(System.out);
System.in.read();
} catch (Throwable t) { throw new Error(t); }
}
static String match(String s, String regex, int group) {
Matcher matcher = Pattern.compile(regex).matcher(s);
matcher.find();
return matcher.group(group);
}
/** It's all about sending a message! */
static void sendByte(OutputStream s) throws IOException {
s.write('!');
s.flush();
}
static int objectsInUse(final Process child,
final String childPid,
final String className) {
final String regex =
"(?m)^ *[0-9]+: +([0-9]+) +[0-9]+ +\\Q"+className+"\\E(?:$| )";
final Callable<Integer> objectsInUse =
new Callable<Integer>() { public Integer call() {
Integer i = Integer.parseInt(
match(commandOutputOf(jmap, "-histo:live", childPid),
regex, 1));
if (i > 100)
System.out.print(
commandOutputOf(jmap,
"-dump:file=dump,format=b",
childPid));
return i;
}};
try { return rendezvousParent(child, objectsInUse); }
catch (Throwable t) { unexpected(t); return -1; }
}
static void realMain(String[] args) throws Throwable {
// jmap doesn't work on Windows
if (System.getProperty("os.name").startsWith("Windows"))
return;
final String childClassName = Job.class.getName();
final String classToCheckForLeaks = Job.classToCheckForLeaks();
final String uniqueID =
String.valueOf(new SplittableRandom().nextInt(Integer.MAX_VALUE));
final String[] jobCmd = {
java, "-Xmx8m", "-XX:+UsePerfData",
"-classpath", System.getProperty("test.class.path"),
childClassName, uniqueID
};
final Process p = new ProcessBuilder(jobCmd).start();
// Ensure subprocess jvm has started, so that jps can find it
p.getInputStream().read();
sendByte(p.getOutputStream());
final String childPid =
match(commandOutputOf(jps, "-m"),
"(?m)^ *([0-9]+) +\\Q"+childClassName+"\\E *"+uniqueID+"$", 1);
final int n0 = objectsInUse(p, childPid, classToCheckForLeaks);
final int n1 = objectsInUse(p, childPid, classToCheckForLeaks);
equal(p.waitFor(), 0);
equal(p.exitValue(), 0);
failed += p.exitValue();
// Check that no objects were leaked.
//
// TODO: This test is very brittle, depending on current JDK
// implementation, and needing occasional adjustment.
System.out.printf("%d -> %d%n", n0, n1);
// Almost always n0 == n1
// Maximum jitter observed in practice is 10 -> 17
check(Math.abs(n1 - n0) < 10);
check(n1 < 25);
drainers.shutdown();
if (!drainers.awaitTermination(LONG_DELAY_MS, MILLISECONDS)) {
drainers.shutdownNow(); // last resort
throw new AssertionError("thread pool did not terminate");
}
}
//----------------------------------------------------------------
// The main class of the child process.
// Job's job is to:
// - provide the name of a class to check for leaks.
// - call rendezvousChild exactly twice, while quiescent.
// - in between calls to rendezvousChild, run code that may leak.
//----------------------------------------------------------------
public static class Job {
static String classToCheckForLeaks() {
return
"java.util.concurrent.locks.AbstractQueuedSynchronizer$Node";
}
public static void main(String[] args) throws Throwable {
// Synchronize with parent process, so that jps can find us
sendByte(System.out);
System.in.read();
final ReentrantLock lock = new ReentrantLock();
lock.lock();
final ReentrantReadWriteLock rwlock
= new ReentrantReadWriteLock();
final ReentrantReadWriteLock.ReadLock readLock
= rwlock.readLock();
final ReentrantReadWriteLock.WriteLock writeLock
= rwlock.writeLock();
rwlock.writeLock().lock();
final BlockingQueue<Object> q = new LinkedBlockingQueue<Object>();
final Semaphore fairSem = new Semaphore(0, true);
final Semaphore unfairSem = new Semaphore(0, false);
//final int threads =
//rnd.nextInt(Runtime.getRuntime().availableProcessors() + 1) + 1;
final int threads = 3;
// On Linux, this test runs very slowly for some reason,
// so use a smaller number of iterations.
// Solaris can handle 1 << 18.
// On the other hand, jmap is much slower on Solaris...
final int iterations = 1 << 8;
final CyclicBarrier cb = new CyclicBarrier(threads+1);
for (int i = 0; i < threads; i++)
new Thread() { public void run() {
try {
final SplittableRandom rnd = new SplittableRandom();
for (int j = 0; j < iterations; j++) {
if (j == iterations/10 || j == iterations - 1) {
cb.await(); // Quiesce
cb.await(); // Resume
}
//int t = rnd.nextInt(2000);
int t = rnd.nextInt(900);
check(! lock.tryLock(t, NANOSECONDS));
check(! readLock.tryLock(t, NANOSECONDS));
check(! writeLock.tryLock(t, NANOSECONDS));
equal(null, q.poll(t, NANOSECONDS));
check(! fairSem.tryAcquire(t, NANOSECONDS));
check(! unfairSem.tryAcquire(t, NANOSECONDS));
}
} catch (Throwable t) { unexpected(t); }
}}.start();
cb.await(); // Quiesce
rendezvousChild(); // Measure
cb.await(); // Resume
cb.await(); // Quiesce
rendezvousChild(); // Measure
cb.await(); // Resume
System.exit(failed);
}
// If something goes wrong, we might never see it, since IO
// streams are connected to the parent. So we need a special
// purpose print method to debug Jobs.
static void debugPrintf(String format, Object... args) {
try {
new PrintStream(new FileOutputStream("/dev/tty"))
.printf(format, args);
} catch (Throwable t) { throw new Error(t); }
}
}
//--------------------- Infrastructure ---------------------------
static volatile int passed = 0, failed = 0;
static void pass() {passed++;}
static void fail() {failed++; Thread.dumpStack();}
static void fail(String msg) {System.out.println(msg); fail();}
static void unexpected(Throwable t) {failed++; t.printStackTrace();}
static void check(boolean cond) {if (cond) pass(); else fail();}
static void check(boolean cond, String m) {if (cond) pass(); else fail(m);}
static void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
try {realMain(args);} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
}