| /******************************************************************************* |
| * Copyright (c) 2000, 2018 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.core.tests.model; |
| |
| import java.util.HashMap; |
| |
| import org.eclipse.core.resources.IWorkspaceRunnable; |
| import org.eclipse.core.resources.ResourcesPlugin; |
| import org.eclipse.core.runtime.*; |
| import org.eclipse.jdt.core.*; |
| import org.eclipse.jdt.internal.core.JavaModelManager; |
| import org.eclipse.jdt.internal.core.JavaProject; |
| |
| import junit.framework.*; |
| |
| /** |
| * DO NOT RELEASE AS PART OF REGRESSION TEST - if failing, can cause testing hang |
| */ |
| public class ThreadSafetyTests extends ModifyingResourceTests { |
| |
| public ThreadSafetyTests(String name) { |
| super(name); |
| } |
| |
| public static Test suite() { |
| return buildModelTestSuite(ThreadSafetyTests.class); |
| } |
| /** |
| * 33231 - deadlocked if activating initializer while some concurrent action is populating the JavaModel |
| */ |
| public void testDeadlock01() throws CoreException { |
| |
| System.out.println("Test deadlock scenario"); |
| try { |
| final IJavaProject project = this.createJavaProject( |
| "P", |
| new String[] {}, |
| new String[] {"org.eclipse.jdt.core.tests.model.TEST_CONTAINER"}, |
| ""); |
| |
| // simulate state on startup (flush containers, and discard their previous values) |
| waitUntilIndexesReady(); |
| project.getJavaModel().close(); |
| JavaModelManager manager = JavaModelManager.getJavaModelManager(); |
| manager.previousSessionContainers = new HashMap<>(5); |
| manager.containers = new HashMap<>(5); |
| manager.removePerProjectInfo((JavaProject)project, true /* remove external jar files indexes and timestamps*/); |
| |
| // use a thread to hold the lock, so as to recreate potential deadlock situation |
| final Semaphore step1 = new Semaphore("<1:permission to populate JavaModel inducing containers inits>", 0); // first acquisition will wait |
| final Semaphore step2 = new Semaphore("<2:permission to perform resource modification >", 0); // first acquisition to wait |
| final Semaphore hasCompleted = new Semaphore(0); |
| |
| ContainerInitializer.setInitializer(new DefaultContainerInitializer(new String[] {"P", ""}){ |
| @Override |
| public void initialize(IPath containerPath, IJavaProject javaProject) throws CoreException { |
| step2.release(); |
| System.out.println(Thread.currentThread() + " initializer has started: attempting to acquire workspace lock"); |
| super.initialize(containerPath, javaProject); |
| System.out.println(Thread.currentThread() + " initializer has finished"); |
| } |
| }); |
| |
| // trigger some delta notification in different thread |
| Thread performJavaOperationInsideWorkspaceLock = new Thread(new Runnable(){ |
| @Override |
| public void run() { |
| try { |
| ResourcesPlugin.getWorkspace().run(new IWorkspaceRunnable() { |
| public void run(IProgressMonitor monitor) throws CoreException { |
| System.out.println(Thread.currentThread() + " got workspace lock"); |
| step1.release(); |
| step2.acquire(); // ensure the java model lock is taken |
| ThreadSafetyTests.this.createFile("/P/X.java", "public class X {}"); |
| System.out.println(Thread.currentThread() + " created file X.java"); |
| } |
| }, null); |
| } catch (CoreException e) { |
| } |
| hasCompleted.release(); |
| System.out.println(Thread.currentThread() +" ResourceModification DONE"); |
| } |
| },"ModifyResource"); |
| performJavaOperationInsideWorkspaceLock.setDaemon(true); |
| performJavaOperationInsideWorkspaceLock.start(); |
| |
| Thread attemptPopulateTheJavaModel = new Thread(new Runnable(){ |
| @Override |
| public void run() { |
| try { |
| step1.acquire(); // ensure workspace lock is taken already |
| System.out.println(Thread.currentThread() + " about to populate Java model"); |
| // needs the JavaModel lock to populate the project |
| project.getChildren(); // trigger classpath initializer activation (requires workspace lock) |
| System.out.println(Thread.currentThread() + " done populating the model"); |
| } catch (JavaModelException e) { |
| } |
| hasCompleted.release(); |
| System.out.println(Thread.currentThread() +" Populate JavaModel DONE"); |
| } |
| },"PopulateModel"); |
| attemptPopulateTheJavaModel.setDaemon(true); |
| attemptPopulateTheJavaModel.start(); |
| |
| hasCompleted.acquire(); // ensure both actions did complete |
| hasCompleted.acquire(); |
| System.out.println("SUCCESS - no deadlock encountered"); |
| } finally { |
| // cleanup |
| this.deleteProject("P"); |
| } |
| } |
| } |