--- a/jdk/src/java.base/share/classes/sun/misc/VM.java Thu Jan 07 09:33:57 2016 -0800
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,433 +0,0 @@
-/*
- * Copyright (c) 1996, 2015, 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. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * 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.
- */
-
-package sun.misc;
-
-import static java.lang.Thread.State.*;
-import java.util.Properties;
-
-public class VM {
-
- /* The following methods used to be native methods that instruct
- * the VM to selectively suspend certain threads in low-memory
- * situations. They are inherently dangerous and not implementable
- * on native threads. We removed them in JDK 1.2. The skeletons
- * remain so that existing applications that use these methods
- * will still work.
- */
- private static boolean suspended = false;
-
- /** @deprecated */
- @Deprecated
- public static boolean threadsSuspended() {
- return suspended;
- }
-
- @SuppressWarnings("deprecation")
- public static boolean allowThreadSuspension(ThreadGroup g, boolean b) {
- return g.allowThreadSuspension(b);
- }
-
- /** @deprecated */
- @Deprecated
- public static boolean suspendThreads() {
- suspended = true;
- return true;
- }
-
- // Causes any suspended threadgroups to be resumed.
- /** @deprecated */
- @Deprecated
- public static void unsuspendThreads() {
- suspended = false;
- }
-
- // Causes threadgroups no longer marked suspendable to be resumed.
- /** @deprecated */
- @Deprecated
- public static void unsuspendSomeThreads() {
- }
-
- /* Deprecated fields and methods -- Memory advice not supported in 1.2 */
-
- /** @deprecated */
- @Deprecated
- public static final int STATE_GREEN = 1;
-
- /** @deprecated */
- @Deprecated
- public static final int STATE_YELLOW = 2;
-
- /** @deprecated */
- @Deprecated
- public static final int STATE_RED = 3;
-
- /** @deprecated */
- @Deprecated
- public static final int getState() {
- return STATE_GREEN;
- }
-
- /** @deprecated */
- @Deprecated
- public static void registerVMNotification(VMNotification n) { }
-
- /** @deprecated */
- @Deprecated
- public static void asChange(int as_old, int as_new) { }
-
- /** @deprecated */
- @Deprecated
- public static void asChange_otherthread(int as_old, int as_new) { }
-
- /*
- * Not supported in 1.2 because these will have to be exported as
- * JVM functions, and we are not sure we want do that. Leaving
- * here so it can be easily resurrected -- just remove the //
- * comments.
- */
-
- /**
- * Resume Java profiling. All profiling data is added to any
- * earlier profiling, unless <code>resetJavaProfiler</code> is
- * called in between. If profiling was not started from the
- * command line, <code>resumeJavaProfiler</code> will start it.
- * <p>
- *
- * NOTE: Profiling must be enabled from the command line for a
- * java.prof report to be automatically generated on exit; if not,
- * writeJavaProfilerReport must be invoked to write a report.
- *
- * @see resetJavaProfiler
- * @see writeJavaProfilerReport
- */
-
- // public native static void resumeJavaProfiler();
-
- /**
- * Suspend Java profiling.
- */
- // public native static void suspendJavaProfiler();
-
- /**
- * Initialize Java profiling. Any accumulated profiling
- * information is discarded.
- */
- // public native static void resetJavaProfiler();
-
- /**
- * Write the current profiling contents to the file "java.prof".
- * If the file already exists, it will be overwritten.
- */
- // public native static void writeJavaProfilerReport();
-
-
- private static volatile boolean booted = false;
- private static final Object lock = new Object();
-
- // Invoked by System.initializeSystemClass just before returning.
- // Subsystems that are invoked during initialization can check this
- // property in order to avoid doing things that should wait until the
- // application class loader has been set up.
- //
- public static void booted() {
- synchronized (lock) {
- booted = true;
- lock.notifyAll();
- }
- }
-
- public static boolean isBooted() {
- return booted;
- }
-
- // Waits until VM completes initialization
- //
- // This method is invoked by the Finalizer thread
- public static void awaitBooted() throws InterruptedException {
- synchronized (lock) {
- while (!booted) {
- lock.wait();
- }
- }
- }
-
- // A user-settable upper limit on the maximum amount of allocatable direct
- // buffer memory. This value may be changed during VM initialization if
- // "java" is launched with "-XX:MaxDirectMemorySize=<size>".
- //
- // The initial value of this field is arbitrary; during JRE initialization
- // it will be reset to the value specified on the command line, if any,
- // otherwise to Runtime.getRuntime().maxMemory().
- //
- private static long directMemory = 64 * 1024 * 1024;
-
- // Returns the maximum amount of allocatable direct buffer memory.
- // The directMemory variable is initialized during system initialization
- // in the saveAndRemoveProperties method.
- //
- public static long maxDirectMemory() {
- return directMemory;
- }
-
- // User-controllable flag that determines if direct buffers should be page
- // aligned. The "-XX:+PageAlignDirectMemory" option can be used to force
- // buffers, allocated by ByteBuffer.allocateDirect, to be page aligned.
- private static boolean pageAlignDirectMemory;
-
- // Returns {@code true} if the direct buffers should be page aligned. This
- // variable is initialized by saveAndRemoveProperties.
- public static boolean isDirectMemoryPageAligned() {
- return pageAlignDirectMemory;
- }
-
- /**
- * Returns true if the given class loader is in the system domain
- * in which all permissions are granted.
- */
- public static boolean isSystemDomainLoader(ClassLoader loader) {
- return loader == null;
- }
-
- /**
- * Returns the system property of the specified key saved at
- * system initialization time. This method should only be used
- * for the system properties that are not changed during runtime.
- * It accesses a private copy of the system properties so
- * that user's locking of the system properties object will not
- * cause the library to deadlock.
- *
- * Note that the saved system properties do not include
- * the ones set by sun.misc.Version.init().
- *
- */
- public static String getSavedProperty(String key) {
- if (savedProps.isEmpty())
- throw new IllegalStateException("Should be non-empty if initialized");
-
- return savedProps.getProperty(key);
- }
-
- // TODO: the Property Management needs to be refactored and
- // the appropriate prop keys need to be accessible to the
- // calling classes to avoid duplication of keys.
- private static final Properties savedProps = new Properties();
-
- // Save a private copy of the system properties and remove
- // the system properties that are not intended for public access.
- //
- // This method can only be invoked during system initialization.
- public static void saveAndRemoveProperties(Properties props) {
- if (booted)
- throw new IllegalStateException("System initialization has completed");
-
- savedProps.putAll(props);
-
- // Set the maximum amount of direct memory. This value is controlled
- // by the vm option -XX:MaxDirectMemorySize=<size>.
- // The maximum amount of allocatable direct buffer memory (in bytes)
- // from the system property sun.nio.MaxDirectMemorySize set by the VM.
- // The system property will be removed.
- String s = (String)props.remove("sun.nio.MaxDirectMemorySize");
- if (s != null) {
- if (s.equals("-1")) {
- // -XX:MaxDirectMemorySize not given, take default
- directMemory = Runtime.getRuntime().maxMemory();
- } else {
- long l = Long.parseLong(s);
- if (l > -1)
- directMemory = l;
- }
- }
-
- // Check if direct buffers should be page aligned
- s = (String)props.remove("sun.nio.PageAlignDirectMemory");
- if ("true".equals(s))
- pageAlignDirectMemory = true;
-
- // Remove other private system properties
- // used by java.lang.Integer.IntegerCache
- props.remove("java.lang.Integer.IntegerCache.high");
-
- // used by sun.launcher.LauncherHelper
- props.remove("sun.java.launcher.diag");
- }
-
- // Initialize any miscellenous operating system settings that need to be
- // set for the class libraries.
- //
- public static void initializeOSEnvironment() {
- if (!booted) {
- OSEnvironment.initialize();
- }
- }
-
- /* Current count of objects pending for finalization */
- private static volatile int finalRefCount;
-
- /* Peak count of objects pending for finalization */
- private static volatile int peakFinalRefCount;
-
- /*
- * Gets the number of objects pending for finalization.
- *
- * @return the number of objects pending for finalization.
- */
- public static int getFinalRefCount() {
- return finalRefCount;
- }
-
- /*
- * Gets the peak number of objects pending for finalization.
- *
- * @return the peak number of objects pending for finalization.
- */
- public static int getPeakFinalRefCount() {
- return peakFinalRefCount;
- }
-
- /*
- * Add {@code n} to the objects pending for finalization count.
- *
- * @param n an integer value to be added to the objects pending
- * for finalization count
- */
- public static void addFinalRefCount(int n) {
- // The caller must hold lock to synchronize the update.
-
- finalRefCount += n;
- if (finalRefCount > peakFinalRefCount) {
- peakFinalRefCount = finalRefCount;
- }
- }
-
- /**
- * Returns Thread.State for the given threadStatus
- */
- public static Thread.State toThreadState(int threadStatus) {
- if ((threadStatus & JVMTI_THREAD_STATE_RUNNABLE) != 0) {
- return RUNNABLE;
- } else if ((threadStatus & JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER) != 0) {
- return BLOCKED;
- } else if ((threadStatus & JVMTI_THREAD_STATE_WAITING_INDEFINITELY) != 0) {
- return WAITING;
- } else if ((threadStatus & JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT) != 0) {
- return TIMED_WAITING;
- } else if ((threadStatus & JVMTI_THREAD_STATE_TERMINATED) != 0) {
- return TERMINATED;
- } else if ((threadStatus & JVMTI_THREAD_STATE_ALIVE) == 0) {
- return NEW;
- } else {
- return RUNNABLE;
- }
- }
-
- /* The threadStatus field is set by the VM at state transition
- * in the hotspot implementation. Its value is set according to
- * the JVM TI specification GetThreadState function.
- */
- private static final int JVMTI_THREAD_STATE_ALIVE = 0x0001;
- private static final int JVMTI_THREAD_STATE_TERMINATED = 0x0002;
- private static final int JVMTI_THREAD_STATE_RUNNABLE = 0x0004;
- private static final int JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER = 0x0400;
- private static final int JVMTI_THREAD_STATE_WAITING_INDEFINITELY = 0x0010;
- private static final int JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT = 0x0020;
-
- /*
- * Returns the first non-null class loader up the execution stack,
- * or null if only code from the null class loader is on the stack.
- */
- public static native ClassLoader latestUserDefinedLoader();
-
- /**
- * Returns {@code true} if we are in a set UID program.
- */
- public static boolean isSetUID() {
- long uid = getuid();
- long euid = geteuid();
- long gid = getgid();
- long egid = getegid();
- return uid != euid || gid != egid;
- }
-
- /**
- * Returns the real user ID of the calling process,
- * or -1 if the value is not available.
- */
- public static native long getuid();
-
- /**
- * Returns the effective user ID of the calling process,
- * or -1 if the value is not available.
- */
- public static native long geteuid();
-
- /**
- * Returns the real group ID of the calling process,
- * or -1 if the value is not available.
- */
- public static native long getgid();
-
- /**
- * Returns the effective group ID of the calling process,
- * or -1 if the value is not available.
- */
- public static native long getegid();
-
- /**
- * Get a nanosecond time stamp adjustment in the form of a single long.
- *
- * This value can be used to create an instant using
- * {@link java.time.Instant#ofEpochSecond(long, long)
- * java.time.Instant.ofEpochSecond(offsetInSeconds,
- * getNanoTimeAdjustment(offsetInSeconds))}.
- * <p>
- * The value returned has the best resolution available to the JVM on
- * the current system.
- * This is usually down to microseconds - or tenth of microseconds -
- * depending on the OS/Hardware and the JVM implementation.
- *
- * @param offsetInSeconds The offset in seconds from which the nanosecond
- * time stamp should be computed.
- *
- * @apiNote The offset should be recent enough - so that
- * {@code offsetInSeconds} is within {@code +/- 2^32} seconds of the
- * current UTC time. If the offset is too far off, {@code -1} will be
- * returned. As such, {@code -1} must not be considered as a valid
- * nano time adjustment, but as an exception value indicating
- * that an offset closer to the current time should be used.
- *
- * @return A nanosecond time stamp adjustment in the form of a single long.
- * If the offset is too far off the current time, this method returns -1.
- * In that case, the caller should call this method again, passing a
- * more accurate offset.
- */
- public static native long getNanoTimeAdjustment(long offsetInSeconds);
-
- static {
- initialize();
- }
- private static native void initialize();
-}