143 lines
5.1 KiB
Java
143 lines
5.1 KiB
Java
/*
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* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.lang.ProcessHandle;
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import jdk.test.lib.util.FileUtils;
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/*
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* @test
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* @bug 8239893
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* @summary Verify that handles for processes that terminate do not accumulate
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* @requires ((os.family == "windows") & (vm.compMode != "Xcomp"))
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* @library /test/lib
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* @run main/othervm/native -Xint CheckHandles
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*/
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public class CheckHandles {
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public static void main(String[] args) throws Exception {
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System.out.println("mypid: " + ProcessHandle.current().pid());
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// Warmup the process launch mechanism and vm to stabilize the number of handles in use
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int MAX_WARMUP = 20;
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long prevCount = FileUtils.getProcessHandleCount();
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for (int i = 0; i < MAX_WARMUP; i++) {
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oneProcess();
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System.gc(); // an opportunity to close unreferenced handles
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sleep(10);
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long count = FileUtils.getProcessHandleCount();
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if (count < 0)
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throw new AssertionError("getProcessHandleCount failed");
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System.out.println("warmup handle delta: " + (count - prevCount));
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prevCount = count;
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}
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System.out.println("Warmup done");
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System.out.println();
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prevCount = FileUtils.getProcessHandleCount();
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long startHandles = prevCount;
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long maxHandles = startHandles;
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int MAX_SPAWN = 50;
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for (int i = 0; i < MAX_SPAWN; i++) {
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oneProcess();
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System.gc(); // an opportunity to close unreferenced handles
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sleep(10);
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long count = FileUtils.getProcessHandleCount();
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if (count < 0)
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throw new AssertionError("getProcessHandleCount failed");
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System.out.println("handle delta: " + (count - prevCount));
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prevCount = count;
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maxHandles = Math.max(maxHandles, count);
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}
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System.out.println("Processes started: " + MAX_SPAWN);
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System.out.println("startHandles: " + startHandles);
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System.out.println("maxHandles: " + maxHandles);
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final float ERROR_PERCENT = 10.0f; // allowable extra handles
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final long ERROR_THRESHOLD = startHandles + Math.round(startHandles * ERROR_PERCENT / 100.0f);
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if (maxHandles >= ERROR_THRESHOLD) {
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throw new AssertionError("Handle use increased by more than " + ERROR_PERCENT + " percent.");
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}
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}
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/**
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* Start a single process and consume its output.
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*/
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private static void oneProcess() {
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try {
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Process testProcess = new ProcessBuilder("cmd", "/c", "dir").start();
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Thread outputConsumer = new Thread(() -> consumeStream(testProcess.getInputStream()));
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outputConsumer.setDaemon(true);
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outputConsumer.start();
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Thread errorConsumer = new Thread(() -> consumeStream(testProcess.getErrorStream()));
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errorConsumer.setDaemon(true);
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errorConsumer.start();
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testProcess.waitFor();
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outputConsumer.join();
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errorConsumer.join();
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} catch (IOException | InterruptedException e) {
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e.printStackTrace();
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throw new RuntimeException("Exception", e);
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}
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}
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private static void consumeStream(InputStream inputStream) {
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BufferedReader reader = null;
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try {
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int lines = 0;
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reader = new BufferedReader(new InputStreamReader(inputStream));
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while (reader.readLine() != null) {
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lines++;
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}
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} catch (IOException e) {
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e.printStackTrace();
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} finally {
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if (reader != null) {
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try {
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reader.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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}
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private static void sleep(long millis) {
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try {
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Thread.sleep(millis);
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} catch (InterruptedException ie) {
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// ignore
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}
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}
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}
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