400 lines
17 KiB
Java
400 lines
17 KiB
Java
/*
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* Copyright (c) 2001, 2021, 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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/*
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* @test
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* @bug 4413752 8262881
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* @summary Test SuspendThread with ObjectMonitor enter.
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* @requires vm.jvmti
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* @library /test/lib
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* @compile SuspendWithObjectMonitorEnter.java
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* @run main/othervm/native -agentlib:SuspendWithObjectMonitorEnter SuspendWithObjectMonitorEnter
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*/
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import java.io.PrintStream;
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//
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// main blocker contender resumer
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// ================= ================ =================== ================
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// launch blocker
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// <launch returns> blocker running
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// launch contender enter threadLock
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// <launch returns> wait for notify contender running
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// launch resumer : block on threadLock
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// <launch returns> : : resumer running
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// suspend contender : <suspended> wait for notify
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// <ready to test> : : :
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// : : : :
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// notify blocker wait finishes : :
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// notify resumer exit threadLock : wait finishes
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// join blocker : : enter threadLock
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// <join returns> blocker exits <resumed> resume contender
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// join resumer : exit threadLock
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// <join returns> enter threadLock resumer exits
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// join contender exit threadLock
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// <join returns> contender exits
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//
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public class SuspendWithObjectMonitorEnter {
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private static final String AGENT_LIB = "SuspendWithObjectMonitorEnter";
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private static final int exit_delta = 95;
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private static final int DEF_TIME_MAX = 60; // default max # secs to test
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private static final int JOIN_MAX = 30; // max # secs to wait for join
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public static final int TS_INIT = 1; // initial testState
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public static final int TS_BLOCKER_RUNNING = 2; // blocker is running
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public static final int TS_CONTENDER_RUNNING = 3; // contender is running
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public static final int TS_RESUMER_RUNNING = 4; // resumer is running
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public static final int TS_CALL_SUSPEND = 5; // call suspend on contender
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public static final int TS_DONE_BLOCKING = 6; // done blocking threadLock
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public static final int TS_READY_TO_RESUME = 7; // ready to resume contender
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public static final int TS_CALL_RESUME = 8; // call resume on contender
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public static final int TS_CONTENDER_DONE = 9; // contender has run; done
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public static Object barrierLaunch = new Object(); // controls thread launch
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public static Object barrierBlocker = new Object(); // controls blocker
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public static Object barrierResumer = new Object(); // controls resumer
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public static Object threadLock = new Object(); // testing object
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public static long count = 0;
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public static boolean printDebug = false;
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public volatile static int testState;
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private static void log(String msg) { System.out.println(msg); }
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native static int suspendThread(SuspendWithObjectMonitorEnterWorker thr);
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native static int wait4ContendedEnter(SuspendWithObjectMonitorEnterWorker thr);
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public static void main(String[] args) throws Exception {
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try {
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System.loadLibrary(AGENT_LIB);
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log("Loaded library: " + AGENT_LIB);
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} catch (UnsatisfiedLinkError ule) {
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log("Failed to load library: " + AGENT_LIB);
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log("java.library.path: " + System.getProperty("java.library.path"));
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throw ule;
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}
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int timeMax = 0;
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if (args.length == 0) {
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timeMax = DEF_TIME_MAX;
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} else {
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int argIndex = 0;
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int argsLeft = args.length;
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if (args[0].equals("-p")) {
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printDebug = true;
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argIndex = 1;
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argsLeft--;
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}
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if (argsLeft == 0) {
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timeMax = DEF_TIME_MAX;
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} else if (argsLeft == 1) {
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try {
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timeMax = Integer.parseUnsignedInt(args[argIndex]);
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} catch (NumberFormatException nfe) {
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System.err.println("'" + args[argIndex] +
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"': invalid timeMax value.");
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usage();
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}
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} else {
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usage();
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}
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}
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System.exit(run(timeMax, System.out) + exit_delta);
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}
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public static void logDebug(String mesg) {
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if (printDebug) {
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System.err.println(Thread.currentThread().getName() + ": " + mesg);
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}
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}
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public static void usage() {
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System.err.println("Usage: " + AGENT_LIB + " [-p][time_max]");
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System.err.println("where:");
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System.err.println(" -p ::= print debug info");
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System.err.println(" time_max ::= max looping time in seconds");
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System.err.println(" (default is " + DEF_TIME_MAX +
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" seconds)");
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System.exit(1);
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}
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public static int run(int timeMax, PrintStream out) {
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return (new SuspendWithObjectMonitorEnter()).doWork(timeMax, out);
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}
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public static void checkTestState(int exp) {
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if (testState != exp) {
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System.err.println("Failure at " + count + " loops.");
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throw new InternalError("Unexpected test state value: "
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+ "expected=" + exp + " actual=" + testState);
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}
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}
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public int doWork(int timeMax, PrintStream out) {
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SuspendWithObjectMonitorEnterWorker blocker; // blocker thread
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SuspendWithObjectMonitorEnterWorker contender; // contender thread
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SuspendWithObjectMonitorEnterWorker resumer; // resumer thread
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System.out.println("About to execute for " + timeMax + " seconds.");
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long start_time = System.currentTimeMillis();
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while (System.currentTimeMillis() < start_time + (timeMax * 1000)) {
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count++;
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testState = TS_INIT; // starting the test loop
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// launch the blocker thread
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synchronized (barrierLaunch) {
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blocker = new SuspendWithObjectMonitorEnterWorker("blocker");
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blocker.start();
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while (testState != TS_BLOCKER_RUNNING) {
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try {
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barrierLaunch.wait(0); // wait until it is running
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} catch (InterruptedException ex) {
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}
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}
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}
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// launch the contender thread
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synchronized (barrierLaunch) {
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contender = new SuspendWithObjectMonitorEnterWorker("contender");
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contender.start();
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while (testState != TS_CONTENDER_RUNNING) {
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try {
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barrierLaunch.wait(0); // wait until it is running
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} catch (InterruptedException ex) {
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}
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}
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}
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// launch the resumer thread
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synchronized (barrierLaunch) {
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resumer = new SuspendWithObjectMonitorEnterWorker("resumer", contender);
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resumer.start();
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while (testState != TS_RESUMER_RUNNING) {
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try {
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barrierLaunch.wait(0); // wait until it is running
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} catch (InterruptedException ex) {
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}
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}
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}
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// wait for the contender thread to block
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logDebug("before contended enter wait");
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int retCode = wait4ContendedEnter(contender);
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if (retCode != 0) {
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throw new RuntimeException("error in JVMTI GetThreadState: " +
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"retCode=" + retCode);
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}
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logDebug("done contended enter wait");
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checkTestState(TS_RESUMER_RUNNING);
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testState = TS_CALL_SUSPEND;
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logDebug("before suspend thread");
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retCode = suspendThread(contender);
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if (retCode != 0) {
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throw new RuntimeException("error in JVMTI SuspendThread: " +
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"retCode=" + retCode);
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}
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logDebug("suspended thread");
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//
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// At this point, all of the child threads are running
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// and we can get to meat of the test:
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//
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// - suspended threadLock contender
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// - a threadLock exit in the blocker thread
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// - a threadLock enter in the resumer thread
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// - resumption of the contender thread
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// - a threadLock enter in the freshly resumed contender thread
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//
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synchronized (barrierBlocker) {
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checkTestState(TS_CALL_SUSPEND);
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// tell blocker thread to exit threadLock
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testState = TS_DONE_BLOCKING;
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barrierBlocker.notify();
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}
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synchronized (barrierResumer) {
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// tell resumer thread to resume contender thread
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testState = TS_READY_TO_RESUME;
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barrierResumer.notify();
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// Can't call checkTestState() here because the
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// resumer thread may have already resumed the
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// contender thread.
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}
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try {
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blocker.join();
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resumer.join(JOIN_MAX * 1000);
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if (resumer.isAlive()) {
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System.err.println("Failure at " + count + " loops.");
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throw new InternalError("resumer thread is stuck");
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}
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contender.join(JOIN_MAX * 1000);
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if (contender.isAlive()) {
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System.err.println("Failure at " + count + " loops.");
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throw new InternalError("contender thread is stuck");
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}
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} catch (InterruptedException ex) {
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}
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checkTestState(TS_CONTENDER_DONE);
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}
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System.out.println("Executed " + count + " loops in " + timeMax +
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" seconds.");
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return 0;
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}
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}
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class SuspendWithObjectMonitorEnterWorker extends Thread {
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private SuspendWithObjectMonitorEnterWorker target; // target for resume operation
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public SuspendWithObjectMonitorEnterWorker(String name) {
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super(name);
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}
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public SuspendWithObjectMonitorEnterWorker(String name, SuspendWithObjectMonitorEnterWorker target) {
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super(name);
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this.target = target;
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}
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native static int resumeThread(SuspendWithObjectMonitorEnterWorker thr);
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public void run() {
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SuspendWithObjectMonitorEnter.logDebug("thread running");
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//
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// Launch the blocker thread:
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// - grabs threadLock
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// - holds threadLock until we tell it let go
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// - releases threadLock
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//
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if (getName().equals("blocker")) {
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// grab threadLock before we tell main we are running
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SuspendWithObjectMonitorEnter.logDebug("before enter threadLock");
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synchronized(SuspendWithObjectMonitorEnter.threadLock) {
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SuspendWithObjectMonitorEnter.logDebug("enter threadLock");
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SuspendWithObjectMonitorEnter.checkTestState(SuspendWithObjectMonitorEnter.TS_INIT);
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synchronized(SuspendWithObjectMonitorEnter.barrierBlocker) {
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synchronized(SuspendWithObjectMonitorEnter.barrierLaunch) {
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// tell main we are running
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SuspendWithObjectMonitorEnter.testState = SuspendWithObjectMonitorEnter.TS_BLOCKER_RUNNING;
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SuspendWithObjectMonitorEnter.barrierLaunch.notify();
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}
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SuspendWithObjectMonitorEnter.logDebug("thread waiting");
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// TS_READY_TO_RESUME is set right after TS_DONE_BLOCKING
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// is set so either can get the blocker thread out of
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// this wait() wrapper:
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while (SuspendWithObjectMonitorEnter.testState != SuspendWithObjectMonitorEnter.TS_DONE_BLOCKING &&
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SuspendWithObjectMonitorEnter.testState != SuspendWithObjectMonitorEnter.TS_READY_TO_RESUME) {
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try {
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// wait for main to tell us when to exit threadLock
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SuspendWithObjectMonitorEnter.barrierBlocker.wait(0);
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} catch (InterruptedException ex) {
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}
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}
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}
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SuspendWithObjectMonitorEnter.logDebug("exit threadLock");
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}
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}
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//
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// Launch the contender thread:
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// - tries to grab the threadLock
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// - grabs threadLock
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// - releases threadLock
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//
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else if (getName().equals("contender")) {
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synchronized(SuspendWithObjectMonitorEnter.barrierLaunch) {
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// tell main we are running
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SuspendWithObjectMonitorEnter.testState = SuspendWithObjectMonitorEnter.TS_CONTENDER_RUNNING;
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SuspendWithObjectMonitorEnter.barrierLaunch.notify();
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}
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SuspendWithObjectMonitorEnter.logDebug("before enter threadLock");
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synchronized(SuspendWithObjectMonitorEnter.threadLock) {
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SuspendWithObjectMonitorEnter.logDebug("enter threadLock");
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SuspendWithObjectMonitorEnter.checkTestState(SuspendWithObjectMonitorEnter.TS_CALL_RESUME);
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SuspendWithObjectMonitorEnter.testState = SuspendWithObjectMonitorEnter.TS_CONTENDER_DONE;
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SuspendWithObjectMonitorEnter.logDebug("exit threadLock");
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}
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}
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//
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// Launch the resumer thread:
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// - tries to grab the threadLock (should not block!)
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// - grabs threadLock
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// - resumes the contended thread
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// - releases threadLock
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//
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else if (getName().equals("resumer")) {
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synchronized(SuspendWithObjectMonitorEnter.barrierResumer) {
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synchronized(SuspendWithObjectMonitorEnter.barrierLaunch) {
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// tell main we are running
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SuspendWithObjectMonitorEnter.testState = SuspendWithObjectMonitorEnter.TS_RESUMER_RUNNING;
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SuspendWithObjectMonitorEnter.barrierLaunch.notify();
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}
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SuspendWithObjectMonitorEnter.logDebug("thread waiting");
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while (SuspendWithObjectMonitorEnter.testState != SuspendWithObjectMonitorEnter.TS_READY_TO_RESUME) {
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try {
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// wait for main to tell us when to continue
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SuspendWithObjectMonitorEnter.barrierResumer.wait(0);
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} catch (InterruptedException ex) {
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}
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}
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}
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SuspendWithObjectMonitorEnter.logDebug("before enter threadLock");
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synchronized(SuspendWithObjectMonitorEnter.threadLock) {
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SuspendWithObjectMonitorEnter.logDebug("enter threadLock");
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SuspendWithObjectMonitorEnter.checkTestState(SuspendWithObjectMonitorEnter.TS_READY_TO_RESUME);
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SuspendWithObjectMonitorEnter.testState = SuspendWithObjectMonitorEnter.TS_CALL_RESUME;
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// resume the contender thread so contender.join() can work
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SuspendWithObjectMonitorEnter.logDebug("before resume thread");
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int retCode = resumeThread(target);
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if (retCode != 0) {
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throw new RuntimeException("error in JVMTI ResumeThread: " +
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"retCode=" + retCode);
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}
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SuspendWithObjectMonitorEnter.logDebug("resumed thread");
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SuspendWithObjectMonitorEnter.logDebug("exit threadLock");
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}
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}
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}
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}
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