1 /*
2 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 import java.io.BufferedReader;
25 import java.io.IOException;
26 import java.io.InputStream;
27 import java.io.InputStreamReader;
28 import java.lang.ProcessHandle;
29
30 /*
31 * @test
32 * @bug 8239893
33 * @summary Verify that handles for processes that terminate do not accumulate
34 * @requires (os.family == "windows")
35 * @run main/native CheckHandles
36 */
37 public class CheckHandles {
38
39 // Return the current process handle count
40 private static native long getProcessHandleCount();
41
42 public static void main(String[] args) throws Exception {
43 System.loadLibrary("CheckHandles");
44
45 System.out.println("mypid: " + ProcessHandle.current().pid());
46 long minHandles = Long.MAX_VALUE;
47 long maxHandles = 0L;
48 int MAX_SPAWN = 50;
49 for (int i = 0; i < MAX_SPAWN; i++) {
50 try {
51 Process testProcess = new ProcessBuilder("cmd", "/c", "dir").start();
52
53 Thread outputConsumer = new Thread(() -> consumeStream(testProcess.pid(), testProcess.getInputStream()));
54 outputConsumer.setDaemon(true);
55 outputConsumer.start();
56 Thread errorConsumer = new Thread(() -> consumeStream(testProcess.pid(), testProcess.getErrorStream()));
57 errorConsumer.setDaemon(true);
58 errorConsumer.start();
59
60 testProcess.waitFor();
61 System.gc();
62 outputConsumer.join();
63 errorConsumer.join();
64 minHandles = Math.min(minHandles, getProcessHandleCount());
65 maxHandles = Math.max(maxHandles, getProcessHandleCount());
66 } catch (IOException | InterruptedException e) {
67 e.printStackTrace();
68 throw e;
69 }
70 }
71 final long ERROR_PERCENT = 10;
72 final long ERROR_THRESHOLD = minHandles + (minHandles / ERROR_PERCENT); // 10% increase over min to passing max
73 if (maxHandles >= ERROR_THRESHOLD) {
74 System.out.println("Processes started: " + MAX_SPAWN);
75 System.out.println("minhandles: " + minHandles);
76 System.out.println("maxhandles: " + maxHandles);
77 throw new AssertionError("Handle use increased by more than " + ERROR_PERCENT + " percent.");
78 }
79 }
80
81 private static void consumeStream(long pid, InputStream inputStream) {
82 BufferedReader reader = null;
83 try {
84 int lines = 0;
85 reader = new BufferedReader(new InputStreamReader(inputStream));
86 while (reader.readLine() != null) {
87 lines++;
88 }
89 } catch (IOException e) {
90 e.printStackTrace();
91 } finally {
92 if (reader != null) {
93 try {
94 reader.close();
95 } catch (IOException e) {
96 e.printStackTrace();
97 }
98 }
99 }
100 }
101 }