1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17import java.util.Map;
18
19public class Main implements Runnable {
20    static final int numberOfThreads = 5;
21    static final int totalOperations = 1000;
22
23    public static void main(String[] args) throws Exception {
24        final Thread[] threads = new Thread[numberOfThreads];
25        for (int t = 0; t < threads.length; t++) {
26            threads[t] = new Thread(new Main());
27            threads[t].start();
28        }
29        for (Thread t : threads) {
30            t.join();
31        }
32        System.out.println("Finishing");
33    }
34
35    public void test_getId() {
36        if (Thread.currentThread().getId() <= 0) {
37            System.out.println("current thread's ID is not positive");
38        }
39        // Check all the current threads for positive IDs.
40        Map<Thread, StackTraceElement[]> stMap = Thread.getAllStackTraces();
41        for (Thread thread : stMap.keySet()) {
42            if (thread.getId() <= 0) {
43                System.out.println("thread's ID is not positive: " + thread.getName());
44            }
45        }
46    }
47
48    public void run() {
49        for (int i = 0; i < totalOperations; ++i) {
50            test_getId();
51        }
52    }
53}
54