test/1919-vminit-thread-start-timing/src/art/Test1919.java

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package art;

public class Test1919 {
  public static final boolean PRINT_ALL_THREADS = false;

  public static void run() throws Exception {
    Thread testing_thread = getTestingThread();
    // TODO(b/124284724): For unknown reasons the testing thread will sometimes SEGV after the test
    // has otherwise completed successfully. This has only been observed on the release version of
    // art (libart.so) and I haven't had any luck reproing it. I assume it has something to do with
    // racing between the DetachCurrentThread and shutdown but I'm not sure. Since the runtime
    // normally never shuts down anyway for now I'll just ensure everything gets cleaned up early to
    // prevent the problem from showing up.
    testing_thread.join();
    for (Event e : getEvents()) {
      if (e.thr != null) {
        if (PRINT_ALL_THREADS ||
            e.thr.equals(Thread.currentThread()) ||
            e.thr.equals(testing_thread)) {
          System.out.println(e.name + ": " + e.thr.getName());
        }
      }
    }
  }

  static class Event {
    public final String name;
    public final Thread thr;
    public Event(String name, Thread thr) {
      this.name = name;
      this.thr = thr;
    }
  }

  public static Event[] getEvents() {
    String[] ns = getEventNames();
    Thread[] ts = getEventThreads();
    Event[] es = new Event[Math.min(ns.length, ts.length)];
    for (int i = 0; i < es.length; i++) {
      es[i] = new Event(ns[i], ts[i]);
    }
    return es;
  }

  public static native String[] getEventNames();
  public static native Thread[] getEventThreads();

  public static native Thread getTestingThread();
}