/*
* @(#) $(JCGO)/goclsp/vm/java/lang/VMThread.java --
* VM specific methods for Java "Thread" 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.PrintStream;
final class VMThread /* hard-coded class name */
{
static final class ExitMain /* hard-coded class name */
{ /* used by VM classes only */
static boolean initialized; /* used by VM classes only */
static
{
if (mainVMThread == null) /* hack */
{
createAttachedThread0X(null, "", null, 0); /* hack */
run0X(null); /* hack */
Throwable throwable = new Throwable(); /* hack */
jniExceptionDescribe0X(throwable); /* hack */
detachThread0X(throwable); /* hack */
destroyJavaVM0X(null, 0); /* hack */
}
initialized = true; /* hack */
VMRuntime.createMainFinalizer();
}
static long vmStartTime = getStartTimeMillis(); /* hack */
private ExitMain() {}
}
static final class UncaughtHandler /* hack */
{ /* used by VM classes only */
private boolean insideJniExc;
UncaughtHandler() {}
final synchronized boolean printJniException(Throwable throwable)
{
boolean done = false;
if (throwable != null && !insideJniExc)
{
insideJniExc = true;
try
{
Thread thread;
PrintStream err = System.err;
if (err != null && (thread = currentThread()) != null && /* hack */
thread.group != null) /* hack */
{
err.println("[JNI] Exception in thread \"" + thread.getName() + "\": " +
throwable.toString());
done = true;
}
}
finally
{
insideJniExc = false;
}
}
return done;
}
final boolean printException(Thread thread, Throwable throwable)
{
PrintStream err = System.err;
if (err != null) /* hack */
{
if (thread != null &&
thread.group != null) /* hack */
{
try
{
thread.getUncaughtExceptionHandler().uncaughtException(thread,
throwable);
return true;
}
catch (Error e) {}
catch (RuntimeException e) {}
}
try
{
err.println();
synchronized (err)
{
err.print("Exception ");
err.println(throwable.getClass().getName());
}
return true;
}
catch (Error e) {}
catch (RuntimeException e) {}
}
return false;
}
}
private static final int STATE_NEW = 0;
private static final int STATE_RUNNABLE = 1;
private static final int STATE_BLOCKED = 2;
private static final int STATE_WAITING = 3;
private static final int STATE_TIMED_WAITING = 4;
private static final int STATE_TERMINATED = 5;
private static final int PARKFLAGS_PARKED = 0x1;
private static final int PARKFLAGS_UNPARKPERMIT = 0x2;
private static boolean hasThreads;
static int nonDaemonCnt; /* used by VM classes only */
private static final Object[] threadStartLock = {};
static final Object nonDaemonLock =
new Object(); /* used by VM classes only */
static VMThread mainVMThread; /* used by VM classes only */
private static volatile PrintStream sysOut;
private static volatile UncaughtHandler uncaughtHandler;
private static int liveThreadCnt;
private static int maxLiveThreadCnt;
private static long totalStartedCnt;
final Thread thread;
private volatile int threadStatus /* = STATE_NEW */;
private transient volatile Object vmdata;
private int parkFlags;
private int suspendCount;
static
{
setupMainThread();
if (mainVMThread == null) /* hack */
throwIllegalMonitorStateException0X(); /* hack */
}
private VMThread(Thread thread)
{
this.thread = thread;
}
static void create(Thread thread, long stacksize)
{
VMThread vt = new VMThread(thread);
vt.start(stacksize);
vt.attachInner();
/* if (vt == null) thread.run(); */ /* hack */
}
String getName()
{
return thread.name;
}
void setName(String name)
{
thread.name = name;
}
void setPriority(int priority)
{
thread.priority = priority;
nativeSetPriority(priority);
}
int getPriority()
{
return thread.priority;
}
boolean isDaemon()
{
return thread.daemon;
}
int countStackFrames()
{
Object vmdata = this.vmdata;
int count;
if (vmdata == null || (count = countStackFrames0(vmdata)) < 0)
throw new IllegalThreadStateException();
return count;
}
void join(long ms, int ns)
throws InterruptedException
{
synchronized (this)
{
while (thread.vmThread != null)
{
wait(this, ms, ns);
if (ms != 0L || ns != 0)
break;
}
}
}
void stop(Throwable throwable)
{
synchronized (thread)
{
if (threadStatus == STATE_NEW)
{
thread.stillborn = throwable;
return;
}
if (threadStatus == STATE_TERMINATED)
return;
}
nativeStop(throwable);
}
private void start(long stacksize)
{
boolean retrying = false;
while ((vmdata = start0(thread, stacksize)) == null)
{
if (retrying || !isStartRetryNeededOnce())
throw new OutOfMemoryError("cannot start thread: ".concat(getName()));
retrying = true;
}
synchronized (threadStartLock)
{
thread.vmThread = this; /* hack */
totalStartedCnt++;
notify(threadStartLock, true);
}
yield();
}
void interrupt()
{
Object vmdata = this.vmdata;
if (vmdata != null)
synchronized (this)
{
if (parkFlags != (PARKFLAGS_PARKED | PARKFLAGS_UNPARKPERMIT))
interrupt0(vmdata, 1);
else parkFlags = PARKFLAGS_PARKED;
}
}
boolean isInterrupted()
{
Object vmdata = this.vmdata;
int res = 0;
if (vmdata != null)
synchronized (this)
{
if (parkFlags != (PARKFLAGS_PARKED | PARKFLAGS_UNPARKPERMIT))
res = interrupt0(vmdata, 0);
}
return res > 0;
}
void suspend()
{
Object vmdata = this.vmdata;
if (vmdata != null)
suspend0(vmdata, 1);
}
void resume()
{
Object vmdata = this.vmdata;
if (vmdata != null)
suspend0(vmdata, -1);
}
void nativeSetPriority(int priority)
{
Object vmdata = this.vmdata;
if (vmdata != null)
nativeSetPriority0(vmdata, priority);
}
void nativeStop(Throwable throwable)
{
if (currentThread().vmThread == this)
VMClass.throwException(throwable);
Object vmdata = this.vmdata;
if (vmdata != null)
nativeStop0(vmdata, throwable);
}
String getState()
{
int state = threadStatus;
Object vmdata;
if (state == STATE_RUNNABLE && (vmdata = this.vmdata) != null)
state = getState0(vmdata);
switch (state)
{
case STATE_NEW:
return "NEW";
case STATE_RUNNABLE:
return "RUNNABLE";
case STATE_BLOCKED:
return "BLOCKED";
case STATE_WAITING:
return "WAITING";
case STATE_TIMED_WAITING:
return "TIMED_WAITING";
}
return "TERMINATED";
}
static Thread currentThread()
{
Thread thread = (Thread) currentThread0();
VMThread vt;
if (thread == null && ((vt = mainVMThread) == null || /* hack */
(thread = vt.thread) == null)) /* hack */
throw new InternalError();
return thread;
}
static native void yield(); /* JVM-core */
static boolean interrupted()
{
VMThread vt = currentThread().vmThread;
Object vmdata;
int res = 0;
if (vt != null && (vmdata = vt.vmdata) != null)
synchronized (vt)
{
res = interrupt0(vmdata, -1);
}
return res > 0;
}
static void sleep(long ms, int ns)
throws InterruptedException
{
if (ms != 0L || ns != 0)
{
VMThread vt = currentThread().vmThread;
if (vt != null)
synchronized (vt)
{
wait(vt, ms, ns);
}
}
else
{
yield();
if (interrupted())
throw new InterruptedException();
}
}
static boolean holdsLock(Object obj)
{
if (obj == null)
throw new NullPointerException();
return notify0(obj, -1) >= 0;
}
static final void notify(Object obj, boolean all)
{ /* used by VM classes only */
if (notify0(obj, all ? 1 : 0) < 0)
throw new IllegalMonitorStateException();
}
static final void wait(Object obj, long ms, int ns)
throws InterruptedException
{ /* used by VM classes only */
int res = wait0(obj, ms, ns);
if (res < 0)
throw new IllegalMonitorStateException();
if (res != 0)
throw new InterruptedException();
}
static final void initSystemErr() /* hard-coded method signature */
{ /* used by VM classes only */
uncaughtHandler = new UncaughtHandler();
if (mainVMThread == null) /* hack */
{
jniExceptionDescribe0X(new Throwable()); /* hack */
destroyJavaVM0X(null, 0); /* hack */
}
}
static final void setSystemOut(
PrintStream out) /* hard-coded method signature */
{ /* used by VM classes only */
/* if (out == null) out = System.err; */ /* hack */
sysOut = out;
}
static final void flushSystemOut()
{ /* used by VM classes only */
PrintStream out = sysOut;
if (out != null)
{
try
{
out.flush();
}
catch (Error e) {}
catch (RuntimeException e) {}
}
}
static final void printUncaughtException(Thread thread, Throwable throwable)
{ /* used by VM classes only */
if (!(throwable instanceof ThreadDeath))
{
if (thread != null)
flushSystemOut();
UncaughtHandler handler;
if ((handler = uncaughtHandler) == null ||
!handler.printException(thread, throwable))
{
if (throwable instanceof RuntimeException)
throw (RuntimeException) throwable;
throw (Error) (throwable instanceof Error ? throwable :
(new InternalError("VMThread")).initCause(throwable));
}
}
}
static final void rootGroupAdd(Thread thread)
{ /* used by VM classes only */
if (thread.group == null)
(thread.group = ThreadGroup.root).addThread(thread);
}
static final int countStackFrames(Thread thread)
{ /* used by VM classes only */
VMThread vt = thread.vmThread;
if (vt == null)
throw new IllegalThreadStateException();
return vt.countStackFrames();
}
static final void suspendNested(Thread thread)
{ /* used by VM classes only */
VMThread vt = thread.vmThread;
if (vt != null)
synchronized (vt)
{
if (++vt.suspendCount == 1)
vt.suspend();
}
}
static final void resumeNested(Thread thread)
{ /* used by VM classes only */
VMThread vt = thread.vmThread;
if (vt != null)
synchronized (vt)
{
if (--vt.suspendCount == 0)
vt.resume();
}
}
static final int getSuspendCount(Thread thread)
{ /* used by VM classes only */
int count = 0;
VMThread vt = thread.vmThread;
if (vt != null)
synchronized (vt)
{
count = vt.suspendCount;
}
return count;
}
static final long getStartTimeMillis()
{ /* used by VM classes only */
long startTime;
if ((startTime = ExitMain.vmStartTime) == 0L) /* hack */
{
startTime = VMSystem.currentTimeMillis();
ExitMain.vmStartTime = startTime;
}
return startTime;
}
static final int getPeakThreadCount(boolean reset)
{ /* used by VM classes only */
int count = maxLiveThreadCnt;
if (reset)
synchronized (nonDaemonLock)
{
maxLiveThreadCnt = liveThreadCnt;
}
return count + 1;
}
static final long getTotalStartedCount()
{ /* used by VM classes only */
synchronized (threadStartLock)
{
return totalStartedCnt;
}
}
static final void park(boolean isAbsolute, long time)
{ /* used by VM classes only */
VMThread vt = currentThread().vmThread;
if (vt != null)
{
long ms;
int ns = 0;
if (isAbsolute ? (ms = time - VMSystem.currentTimeMillis()) > 0L :
(ms = time / (1000L * 1000L)) >= 0L &&
(ns = (int) (time % (1000L * 1000L))) >= 0)
vt.parkInner(ms, ns);
else
{
synchronized (vt)
{
vt.parkFlags = 0;
}
}
}
}
static final void unpark(Thread thread)
{ /* used by VM classes only */
VMThread vt = thread.vmThread;
if (vt != null)
synchronized (vt)
{
if (vt.parkFlags == PARKFLAGS_PARKED)
{
Object vmdata = vt.vmdata;
if (vmdata != null && interrupt0(vmdata, 1) <= 0)
vt.parkFlags = PARKFLAGS_PARKED | PARKFLAGS_UNPARKPERMIT;
}
else if (vt.parkFlags == 0)
vt.parkFlags = PARKFLAGS_UNPARKPERMIT;
}
}
static final void throwIllegalMonitorStateException0X()
{ /* called from native code */
throw new IllegalMonitorStateException();
}
static final int jniExceptionDescribe0X(Object throwableObj)
{ /* called from native code */
if (throwableObj instanceof ThreadDeath)
return 1;
UncaughtHandler handler;
return (handler = uncaughtHandler) != null &&
handler.printJniException((Throwable) throwableObj) ? 1 : 0;
}
static final int run0X(Object vmdata)
{ /* called from native code */
try
{
Thread thread;
if (vmdata != null && (thread = currentThread()) != null) /* hack */
{
VMThread vt;
synchronized (threadStartLock)
{
while ((vt = thread.vmThread) == null)
{
try
{
wait(threadStartLock, 0L, 0);
}
catch (InterruptedException e) {}
}
}
if (vt.vmdata != vmdata)
throw new InternalError("VMThread.start() fault");
nativeSetPriority0(vmdata, vt.getPriority());
vt.run();
}
}
catch (Throwable throwable)
{
printUncaughtException(null, throwable);
}
return 0;
}
static final Object createAttachedThread0X(Object groupObj, String name,
Object vmdata, int daemon)
throws ClassCastException
{ /* called from native code */
if (mainVMThread == null || ThreadGroup.root == null) /* hack */
throw new InternalError("VMThread class not initialized");
Thread thread = new Thread((VMThread) null, name, Thread.NORM_PRIORITY,
daemon != 0);
(thread.group = groupObj != null ? (ThreadGroup) groupObj :
ThreadGroup.root).addThread(thread);
VMThread vt = new VMThread(thread);
vt.vmdata = vmdata;
vt.threadStatus = STATE_RUNNABLE;
vt.attachInner();
return thread;
}
static final int detachThread0X(Object throwableObj)
{ /* called from native code */
VMThread vt = null;
try
{
Thread thread = currentThread();
if (thread != null)
{
vt = thread.vmThread;
if (throwableObj != null && !(throwableObj instanceof ThreadDeath) &&
vt != null && vt.threadStatus != STATE_TERMINATED)
{
printUncaughtException(thread, (Throwable) throwableObj);
}
}
}
finally
{
if (vt != null)
vt.detachInner();
}
return 0;
}
static final int destroyJavaVM0X(Object throwableObj,
int isInInitializer) /* hard-coded method signature */
{ /* called from native code */
try
{
Thread thread = currentThread();
VMThread vt;
if (thread == null || (vt = thread.vmThread) == null || /* hack */
nonDaemonLock == null || mainVMThread == null ||
Runtime.getRuntime() == null || ThreadGroup.root == null) /* hack */
throw new InternalError("VMThread class not initialized");
if (throwableObj != null)
{
if (throwableObj instanceof ThreadDeath)
throwableObj = null;
else
{
if (!ExitMain.initialized)
throw new InternalError("VMThread class not initialized");
Throwable throwable = (Throwable) throwableObj;
if (isInInitializer != 0 && !(throwable instanceof LinkageError) &&
!(throwable instanceof VirtualMachineError))
{
try
{
throwable = new ExceptionInInitializerError(throwable);
}
catch (Error e)
{
throwable = e;
}
}
printUncaughtException(thread, throwable);
}
}
Thread cleanupThread = null;
if (hasThreads && !(throwableObj instanceof Error))
{
cleanupThread =
new Thread((VMThread) null, "VM cleanup", Thread.NORM_PRIORITY, true)
{
public void run()
{
synchronized (nonDaemonLock)
{
while (nonDaemonCnt != 0)
{
try
{
VMThread.wait(nonDaemonLock, 0L, 0);
}
catch (InterruptedException e) {}
}
}
flushSystemOut();
Runtime.getRuntime().runShutdownHooks();
flushSystemOut();
}
};
rootGroupAdd(cleanupThread);
try
{
cleanupThread.start();
}
catch (OutOfMemoryError e)
{
cleanupThread = null;
}
}
if (cleanupThread == null)
{
flushSystemOut();
Runtime.getRuntime().runShutdownHooks();
flushSystemOut();
}
vt.threadStatus = STATE_TERMINATED;
thread.die();
if (cleanupThread != null)
{
synchronized (vt)
{
notify(vt, true);
}
try
{
cleanupThread.join();
}
catch (InterruptedException e) {}
}
if (throwableObj != null)
VMThrowable.exit(254);
}
catch (OutOfMemoryError e)
{
throw e;
}
catch (Error e)
{
if (throwableObj instanceof OutOfMemoryError)
throw (OutOfMemoryError) throwableObj;
throw e;
}
catch (RuntimeException e)
{
if (throwableObj instanceof OutOfMemoryError)
throw (OutOfMemoryError) throwableObj;
throw (Error) (new InternalError("VMThread")).initCause(e);
}
return 0;
}
private static void setupMainThread()
{
Thread thread =
new Thread((VMThread) null, "main", Thread.NORM_PRIORITY, false);
rootGroupAdd(thread);
VMThread vt = new VMThread(thread);
thread.vmThread = vt;
vt.vmdata = setupMainThread0(thread);
vt.threadStatus = STATE_RUNNABLE;
mainVMThread = vt; /* hack */
Throwable throwable;
if ((throwable = thread.stillborn) != null)
{
thread.stillborn = null;
if (throwable instanceof RuntimeException)
throw (RuntimeException) throwable;
throw (Error) (throwable instanceof Error ? throwable :
(new InternalError("VMThread")).initCause(throwable));
}
vt.nativeSetPriority(vt.getPriority());
}
private static boolean isStartRetryNeededOnce()
{
if (!hasThreads)
return false;
VMRuntime.gcOnNoResources();
yield();
return true;
}
private void attachInner()
{
thread.vmThread = this;
synchronized (nonDaemonLock)
{
hasThreads = true;
int count;
if ((count = ++liveThreadCnt) > maxLiveThreadCnt)
maxLiveThreadCnt = count;
if (!thread.daemon && ++nonDaemonCnt == 0)
notify(nonDaemonLock, false);
}
}
private void detachInner()
{
vmdata = null;
if (threadStatus != STATE_TERMINATED)
{
threadStatus = STATE_TERMINATED;
boolean died = false;
synchronized (nonDaemonLock)
{
liveThreadCnt--;
if (!thread.daemon && --nonDaemonCnt == 0)
{
thread.die();
notify(nonDaemonLock, false);
died = true;
}
}
if (!died)
thread.die();
synchronized (this)
{
notify(this, true);
}
}
}
private void run()
{
try
{
try
{
synchronized (thread)
{
threadStatus = STATE_RUNNABLE;
Throwable throwable = thread.stillborn;
if (throwable != null)
{
thread.stillborn = null;
throw throwable;
}
}
thread.run();
}
catch (Throwable throwable)
{
printUncaughtException(thread, throwable);
}
}
finally
{
detachInner();
}
}
private synchronized void parkInner(long ms, int ns)
{
try
{
if (parkFlags != PARKFLAGS_UNPARKPERMIT)
{
parkFlags = PARKFLAGS_PARKED;
wait(this, ms, ns);
}
}
catch (InterruptedException e)
{
if (parkFlags == PARKFLAGS_PARKED)
interrupt();
}
finally
{
parkFlags = 0;
}
}
private static native int notify0(Object obj, int all); /* JVM-core */
private static native int wait0(Object obj, long ms,
int ns); /* JVM-core */ /* blocking syscall */
private static native Object setupMainThread0(Object thread); /* JVM-core */
private static native Object currentThread0(); /* JVM-core */
private static native Object start0(Object thread,
long stacksize); /* JVM-core */
private static native int nativeSetPriority0(Object vmdata,
int priority); /* JVM-core */
private static native int nativeStop0(Object vmdata,
Object throwable); /* JVM-core */
private static native int interrupt0(Object vmdata, int set); /* JVM-core */
private static native int suspend0(Object vmdata, int set); /* JVM-core */
private static native int countStackFrames0(Object vmdata); /* JVM-core */
private static native int getState0(Object vmdata); /* JVM-core */
}