| /* |
| * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * 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 |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jit.escape.LockCoarsening; |
| |
| import nsk.share.TestFailure; |
| |
| class LockCoarsening { |
| // JVM option '-XX:+EliminateLocks' specified |
| public static boolean eliminateLocks = false; |
| // Number of chances Thread 2 has to acquire the lock |
| public static int numChances = 16; |
| |
| // Signals to Threads_2 that Thread_1 started execuition |
| public static volatile boolean start; |
| // Signals to Thread_2 to stop execution |
| public static volatile boolean done; |
| // Thread_2 has acquired the lock |
| public static volatile boolean acquiredLock; |
| // Actually running the test |
| public static volatile boolean realrun; |
| // Thread 2 'acquire lock chance' number |
| public static volatile int currentChance; |
| |
| static Thread_2 t2; |
| |
| public static void main(String[] args) { |
| parseArgs(args); |
| |
| Thread.currentThread().getThreadGroup().setMaxPriority(Thread.MAX_PRIORITY); |
| |
| currentChance = 1; |
| |
| do { |
| System.out.println("Chance " + currentChance + ":"); |
| |
| Thread_1 t1 = new Thread_1(); |
| t1.getThreadGroup().setMaxPriority(Thread.MAX_PRIORITY); |
| t1.setPriority(Thread.MIN_PRIORITY); |
| t1.start(); |
| |
| try { |
| t1.join(); |
| } catch (InterruptedException e) { |
| } |
| |
| System.out.println(); |
| |
| // if thread 2 hasn't acquired lock and we are not eliminating them, give it one more try... |
| } while (!eliminateLocks && !acquiredLock && ++currentChance <= numChances); |
| |
| System.out.println("Thread 2 has acquired lock: " + acquiredLock); |
| |
| boolean failed = false; |
| |
| if (!eliminateLocks) { |
| if (!acquiredLock) { |
| failed = true; |
| |
| throw new TestFailure("acquiredLock == false, though, '-XX:-EliminateLocks' specified"); |
| } |
| } else { |
| if (acquiredLock) { |
| failed = true; |
| |
| throw new TestFailure("acquiredLock == true, though, '-XX:+EliminateLocks' specified"); |
| } |
| } |
| |
| if (!failed) |
| System.out.println("TEST PASSED"); |
| else |
| throw new TestFailure("TEST FAILED"); |
| } |
| |
| private static void parseArgs(String[] args) { |
| eliminateLocks = false; |
| |
| for (int i = 0; i < args.length; ++i) { |
| String arg = args[i]; |
| String val; |
| |
| if (arg.equals("-eliminateLocks")) { |
| eliminateLocks = true; |
| } else if (arg.equals("-numChances")) { |
| if (++i >= args.length) |
| throw new TestFailure("'numChances' parameter requires an integer value"); |
| val = args[i]; |
| try { |
| numChances = Integer.parseInt(val); |
| } catch (NumberFormatException e) { |
| throw new TestFailure("invalid value for 'numChances'"); |
| } |
| } else { |
| System.out.println("Invalid argument: " + args); |
| |
| } |
| } |
| } |
| |
| /** |
| * Thread that enters synchronized parts which are subject of |
| * lock coarsening |
| */ |
| public static class Thread_1 extends Thread { |
| public void run() { |
| Dummy lock = new Dummy(); |
| |
| // An ugly-terrible hack to force JIT to compile Thread_1.doit(): |
| // 1: call method from a static method of another class within a loop |
| System.out.println("**** Compilation warm-up *****"); |
| realrun = false; |
| Helper.callMethod(this, lock); |
| |
| // 2: call method normally |
| System.out.println("**** Starting real run ****"); |
| realrun = true; |
| this.doit(lock); |
| } |
| |
| public final void doit(Dummy _lock) { |
| Dummy lock = new Dummy(); |
| |
| start = false; |
| done = false; |
| acquiredLock = false; |
| |
| /*Thread_2*/ |
| t2 = new Thread_2(lock); |
| t2.getThreadGroup().setMaxPriority(Thread.MAX_PRIORITY); |
| t2.setPriority(Thread.MAX_PRIORITY); |
| t2.start(); |
| |
| //waiting for the Thread_2 to invoke lock.wait() |
| while (t2.getState() != Thread.State.WAITING) { } |
| start = true; |
| |
| // The following code is subject to lock coarsening if eliminateLocks == true |
| { |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| synchronized (lock) { |
| lock.foo(); |
| } |
| |
| // Footer |
| synchronized (lock) { |
| lock.foo(); |
| |
| done = true; |
| |
| lock.notify(); |
| } |
| } |
| try { |
| t2.join(); |
| } catch (InterruptedException e) { |
| } |
| } |
| } |
| |
| /** |
| * Thread that tries to acquire lock during lock coarsening. |
| * If it unable to do it then lock coarsening occurred. |
| */ |
| private static class Thread_2 extends Thread { |
| private Dummy lock; |
| |
| public Thread_2(Dummy lock) { |
| this.lock = lock; |
| } |
| |
| public void run() { |
| Dummy lock = this.lock; |
| |
| synchronized (lock) { |
| if (!done) { |
| while (!start) { |
| try { |
| lock.wait(); |
| } catch (InterruptedException e) { |
| System.out.println("Interrupted!"); |
| } |
| } |
| |
| if (!done) { |
| done = true; |
| |
| acquiredLock = true; |
| |
| if (realrun) { |
| System.out.println("Acquired lock at " + lock.counter + " iteration of " + currentChance + " chance"); |
| } else if (eliminateLocks) { |
| //forcibly stop warm-up as we see that lock coarsening occurs |
| Helper.allowExec = true; |
| } |
| |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Helper class to make method Thread_1.doit() be compiled. |
| */ |
| public static class Helper { |
| public static volatile boolean allowExec = false; |
| private static int iterations = 10000; |
| |
| public static void callMethod(Thread_1 t, Dummy lock) { |
| for (int i = 0; i < iterations; ++i) { |
| t.doit(lock); |
| if (allowExec) |
| break; |
| } |
| } |
| } |
| |
| /** |
| * Class to count number of synchronized statement. |
| * If test fails Dummy.counter shows iteration when lock coarsening did not happen |
| */ |
| public static class Dummy { |
| public volatile int counter = 0; |
| |
| public void foo() { |
| if (done) |
| return; |
| |
| while (t2.getState() != Thread.State.BLOCKED && t2.getState() != Thread.State.WAITING) { |
| this.notifyAll(); |
| |
| Thread.yield(); |
| } |
| |
| this.notifyAll(); |
| |
| while (t2.getState() != Thread.State.BLOCKED) { |
| Thread.yield(); |
| } |
| |
| ++counter; |
| |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| Thread.yield(); |
| } |
| } |
| } |
