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