/*
* @(#) $(JCGO)/goclsp/vm/java/lang/VMRuntime.java --
* VM specific methods for Java "Runtime" class.
**
* Project: JCGO (http://www.ivmaisoft.com/jcgo/)
* Copyright (C) 2001-2009 Ivan Maidanski <ivmai@ivmaisoft.com>
* All rights reserved.
**
* Class specification origin: GNU Classpath v0.93 vm/reference
*/
/*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
**
* This software 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 (GPL) for more details.
**
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
**
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package java.lang;
import java.io.File;
import java.io.IOException;
import java.io.VMAccessorJavaIo;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.List;
import java.util.Map;
final class VMRuntime /* hard-coded class name */
{
static final class TermHandler /* hard-coded class name */
{ /* used by VM classes only */
static
{
handleSigTerm0X(-1); /* hack */
}
TermHandler() {}
}
private static final class FinalizerThread extends Thread
{
private static final int MAX_NOTIFY_COUNT_DELTA = 10;
private static final Object[] lock = {};
private static int stalledThreadCnt;
private static int secondaryThreadCnt;
private static int notifyCount;
private boolean noWait;
private int runFinalizeCount;
private FinalizerThread(boolean noWait, String name, int priority)
{
super((VMThread) null, name, priority, true);
VMThread.rootGroupAdd(this);
this.noWait = noWait;
}
public void run()
{
synchronized (lock)
{
runFinalizeCount = notifyCount;
}
do
{
try
{
do
{
runFinalization0();
synchronized (lock)
{
if (noWait)
return;
if (runFinalizeCount == notifyCount)
VMThread.wait(lock, 0L, 0);
runFinalizeCount = notifyCount;
}
} while (true);
}
catch (InterruptedException e) {}
catch (ThreadDeath e) {}
} while (true);
}
final boolean runFinalization()
{
int threadNum;
synchronized (lock)
{
threadNum = ++secondaryThreadCnt;
}
Thread thread = new FinalizerThread(true, "Secondary finalizer-".concat(
String.valueOf(threadNum)),
currentThread().getPriority());
try
{
thread.start();
}
catch (OutOfMemoryError e)
{
return false;
}
try
{
thread.join();
}
catch (InterruptedException e) {}
return true;
}
final boolean runFinalizationForExitInner()
{
Thread thread;
try
{
thread =
new Thread((VMThread) null, "On-exit finalizer", NORM_PRIORITY, true)
{
public void run()
{
runFinalization0();
runFinalizationForExit0();
}
};
VMThread.rootGroupAdd(thread);
thread.start();
}
catch (OutOfMemoryError e)
{
return false;
}
try
{
thread.join();
}
catch (InterruptedException e) {}
return true;
}
static final boolean createFinalizer()
{
FinalizerThread thread = new FinalizerThread(false, "Finalizer",
MAX_PRIORITY - 1);
synchronized (lock)
{
try
{
thread.start();
}
catch (OutOfMemoryError e)
{
return false;
}
FinalizerThread fnlz = finalizerThread;
finalizerThread = thread;
if (fnlz != null)
fnlz.noWait = true;
}
return true;
}
final void notifyFinalizer()
{
FinalizerThread fnlz;
synchronized (lock)
{
int curNotifyCount = ++notifyCount;
VMThread.notify(lock, true);
if ((fnlz = finalizerThread) == null ||
curNotifyCount - fnlz.runFinalizeCount <= MAX_NOTIFY_COUNT_DELTA ||
currentThread() == fnlz)
return;
fnlz.runFinalizeCount = curNotifyCount - 1;
}
try
{
fnlz.changeStalledFinalizer();
}
catch (OutOfMemoryError e) {}
}
private void changeStalledFinalizer()
{
int threadNum;
synchronized (lock)
{
if (noWait)
return;
threadNum = ++stalledThreadCnt;
}
if (createFinalizer())
{
VMThread vt;
if ((vt = vmThread) != null)
{
vt.setName("Stalled Finalizer-".concat(String.valueOf(threadNum)));
vt.setPriority(MIN_PRIORITY);
}
}
}
}
private static final class FinalizeOnExit
{
FinalizeOnExit() {}
final void runFinalizationForExit()
{
gcOnNoResources();
FinalizerThread fnlz;
if ((fnlz = finalizerThread) == null ||
!fnlz.runFinalizationForExitInner())
{
runFinalization0();
runFinalizationForExit0();
}
}
}
static FinalizerThread finalizerThread; /* used by VM classes only */
private static FinalizeOnExit finalizeOnExit;
private static volatile boolean sigTermFired;
private VMRuntime() {}
static int availableProcessors()
{
int count = availableProcessors0();
if (count <= 0)
{
String str = VMAccessorJavaIo.getenvPlatformVMFile("NUMBER_OF_PROCESSORS");
if (str != null)
{
try
{
count = Integer.parseInt(str);
}
catch (NumberFormatException e) {}
}
if (count <= 0)
count = 1;
}
return count;
}
static void exit(int status)
{
VMThrowable.exit(status);
}
static native long freeMemory(); /* JVM-core */
static native long totalMemory(); /* JVM-core */
static native long maxMemory(); /* JVM-core */
static void gc()
{
gc0(0);
}
static void runFinalization()
{
FinalizerThread fnlz;
if ((fnlz = finalizerThread) == null || !fnlz.runFinalization())
runFinalization0();
}
static void runFinalizationForExit()
{
if (finalizeOnExit != null)
finalizeOnExit.runFinalizationForExit();
}
static void runFinalizersOnExit(boolean enable)
{
if (enable && finalizeOnExit == null)
finalizeOnExit = new FinalizeOnExit();
}
static void traceInstructions(boolean enable)
{
traceCode0(1, enable ? 1 : 0);
}
static void traceMethodCalls(boolean enable)
{
traceCode0(0, enable ? 1 : 0);
}
static int nativeLoad(String filename, ClassLoader loader)
{
return nativeLoad0(filename, loader);
}
static String mapLibraryName(String libname)
{
return VMAccessorJavaIo.mapLibraryNameVMFile(libname);
}
static Process exec(String[] cmd, String[] env, File dir)
throws IOException
{
return VMProcess.exec(cmd, env, dir);
}
static Process exec(List cmdList, Map envMap, File dir, boolean redirect)
throws IOException
{
return VMProcess.exec(cmdList, envMap, dir, redirect);
}
static void enableShutdownHooks()
{
Object obj = new TermHandler(); /* hack */
if (obj != null) /* hack */
enableShutdownHooks0();
}
static final int handleSigTerm0X(int signum)
{ /* called from native code */
try
{
if (signum != -1 && VMThread.currentThread() != null && /* hack */
Runtime.getRuntime() != null && /* hack */
VMThread.ExitMain.initialized && !sigTermFired)
{
sigTermFired = true;
Thread thread =
new Thread((VMThread) null, "SigTerm handler", Thread.MAX_PRIORITY - 2,
false)
{
public void run()
{
AccessController.doPrivileged(
new PrivilegedAction()
{
public Object run()
{
try
{
Runtime.getRuntime().exit(130);
}
catch (SecurityException e) {}
return null;
}
});
}
};
VMThread.rootGroupAdd(thread);
try
{
thread.start();
}
catch (OutOfMemoryError e)
{
thread.run();
}
}
}
catch (ThreadDeath e)
{
throw e;
}
catch (Throwable throwable)
{
VMThread.printUncaughtException(null, throwable);
}
return 0;
}
static final int finalizeObject0X(Object obj)
throws Throwable /* hard-coded method signature */
{ /* called from native code */
FinalizerThread fnlz;
if (obj != null)
obj.finalize();
else if ((fnlz = finalizerThread) != null)
fnlz.notifyFinalizer();
return 0;
}
static final void createMainFinalizer()
{ /* used by VM classes only */
if (runFinalization0() != -1 && FinalizerThread.createFinalizer())
enableNotifyOnFinalization0();
}
static final void gcOnNoResources()
{ /* used by VM classes only */
gc0(1);
}
static final boolean preventIOBlocking()
{ /* used by VM classes only */
return preventIOBlocking0() != 0;
}
static final String getJavaExePathname()
{ /* used by VM classes only */
String path = getJavaExePathname0();
return path != null && path.length() > 0 ? path : ".";
}
static final String getCustomJavaProps()
{ /* used by VM classes only */
String propsLine = VMAccessorJavaIo.getenvPlatformVMFile("JAVA_PROPS");
return propsLine != null || (propsLine = getCustomJavaProps0()) != null ?
propsLine : "";
}
static final String getJavaVmVersion()
{ /* used by VM classes only */
int version = getJavaVmVersion0();
int minor = version % 100;
if (minor < 0)
minor = -minor;
return String.valueOf(version / 100) + "." + (minor < 10 ? "0" : "") +
String.valueOf(minor);
}
private static native int enableNotifyOnFinalization0(); /* JVM-core */
private static native int gc0(int clearRefs); /* JVM-core */
private static native int runFinalization0(); /* JVM-core */
private static native int runFinalizationForExit0(); /* JVM-core */
private static native int availableProcessors0(); /* JVM-core */
private static native int traceCode0(int instr, int on); /* JVM-core */
private static native int nativeLoad0(String filename,
Object loader); /* JVM-core */
private static native int enableShutdownHooks0(); /* JVM-core */
private static native int preventIOBlocking0(); /* JVM-core */
private static native String getJavaExePathname0(); /* JVM-core */
private static native String getCustomJavaProps0(); /* JVM-core */
private static native int getJavaVmVersion0(); /* JVM-core */
}