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Thread.java
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/
Thread.java
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/*
* Copyright (c) 2000, 2021, 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.
*
*/
package sun.jvm.hotspot.runtime;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.Observable;
import sun.jvm.hotspot.utilities.Observer;
public class Thread extends VMObject {
private static long tlabFieldOffset;
private static CIntegerField suspendFlagsField;
// Thread::SuspendFlags enum constants
private static int HAS_ASYNC_EXCEPTION;
private static AddressField activeHandlesField;
private static AddressField currentPendingMonitorField;
private static AddressField currentWaitingMonitorField;
private static JLongField allocatedBytesField;
static {
VM.registerVMInitializedObserver(new Observer() {
public void update(Observable o, Object data) {
initialize(VM.getVM().getTypeDataBase());
}
});
}
private static synchronized void initialize(TypeDataBase db) {
Type typeThread = db.lookupType("Thread");
Type typeJavaThread = db.lookupType("JavaThread");
suspendFlagsField = typeThread.getCIntegerField("_suspend_flags");
HAS_ASYNC_EXCEPTION = db.lookupIntConstant("Thread::_has_async_exception").intValue();
tlabFieldOffset = typeThread.getField("_tlab").getOffset();
activeHandlesField = typeThread.getAddressField("_active_handles");
currentPendingMonitorField = typeJavaThread.getAddressField("_current_pending_monitor");
currentWaitingMonitorField = typeJavaThread.getAddressField("_current_waiting_monitor");
allocatedBytesField = typeThread.getJLongField("_allocated_bytes");
}
public Thread(Address addr) {
super(addr);
}
public int suspendFlags() {
return (int) suspendFlagsField.getValue(addr);
}
public boolean hasAsyncException() {
return (suspendFlags() & HAS_ASYNC_EXCEPTION) != 0;
}
public ThreadLocalAllocBuffer tlab() {
return new ThreadLocalAllocBuffer(addr.addOffsetTo(tlabFieldOffset));
}
public JNIHandleBlock activeHandles() {
Address a = activeHandlesField.getAddress(addr);
if (a == null) {
return null;
}
return new JNIHandleBlock(a);
}
public long allocatedBytes() {
return allocatedBytesField.getValue(addr);
}
public boolean isVMThread() { return false; }
public boolean isJavaThread() { return false; }
public boolean isCompilerThread() { return false; }
public boolean isCodeCacheSweeperThread() { return false; }
public boolean isHiddenFromExternalView() { return false; }
public boolean isJvmtiAgentThread() { return false; }
public boolean isWatcherThread() { return false; }
public boolean isServiceThread() { return false; }
public boolean isMonitorDeflationThread() { return false; }
/** Memory operations */
public void oopsDo(AddressVisitor oopVisitor) {
// FIXME: Empty for now; will later traverse JNI handles and
// pending exception
}
public ObjectMonitor getCurrentPendingMonitor() {
Address monitorAddr = currentPendingMonitorField.getValue(addr);
if (monitorAddr == null) {
return null;
}
return new ObjectMonitor(monitorAddr);
}
public ObjectMonitor getCurrentWaitingMonitor() {
Address monitorAddr = currentWaitingMonitorField.getValue(addr);
if (monitorAddr == null) {
return null;
}
return new ObjectMonitor(monitorAddr);
}
public boolean isLockOwned(Address lock) {
if (isInStack(lock)) return true;
return false;
}
public boolean isInStack(Address a) {
// In the Serviceability Agent we need access to the thread's
// stack pointer to be able to answer this question. Since it is
// only a debugging system at the moment we need access to the
// underlying thread, which is only present for Java threads; see
// JavaThread.java.
return false;
}
/** Assistance for ObjectMonitor implementation */
Address threadObjectAddress() { return addr; }
}