| /* |
| * Copyright (c) 2000, 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. |
| * |
| * 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.*; |
| |
| public class Thread extends VMObject { |
| private static long tlabFieldOffset; |
| |
| private static CIntegerField suspendFlagsField; |
| // Thread::SuspendFlags enum constants |
| private static int EXTERNAL_SUSPEND; |
| private static int EXT_SUSPENDED; |
| 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 type = db.lookupType("Thread"); |
| |
| suspendFlagsField = type.getCIntegerField("_suspend_flags"); |
| EXTERNAL_SUSPEND = db.lookupIntConstant("Thread::_external_suspend").intValue(); |
| EXT_SUSPENDED = db.lookupIntConstant("Thread::_ext_suspended").intValue(); |
| HAS_ASYNC_EXCEPTION = db.lookupIntConstant("Thread::_has_async_exception").intValue(); |
| |
| tlabFieldOffset = type.getField("_tlab").getOffset(); |
| activeHandlesField = type.getAddressField("_active_handles"); |
| currentPendingMonitorField = type.getAddressField("_current_pending_monitor"); |
| currentWaitingMonitorField = type.getAddressField("_current_waiting_monitor"); |
| allocatedBytesField = type.getJLongField("_allocated_bytes"); |
| } |
| |
| public Thread(Address addr) { |
| super(addr); |
| } |
| |
| public int suspendFlags() { |
| return (int) suspendFlagsField.getValue(addr); |
| } |
| |
| public boolean isExternalSuspend() { |
| return (suspendFlags() & EXTERNAL_SUSPEND) != 0; |
| } |
| |
| public boolean isExtSuspended() { |
| return (suspendFlags() & EXT_SUSPENDED) != 0; |
| } |
| |
| public boolean isBeingExtSuspended() { |
| return isExtSuspended() || isExternalSuspend(); |
| } |
| |
| // historical usage: checked for VM or external suspension |
| public boolean isAnySuspended() { |
| return isExtSuspended(); |
| } |
| |
| 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 isHiddenFromExternalView() { return false; } |
| public boolean isJvmtiAgentThread() { return false; } |
| public boolean isWatcherThread() { return false; } |
| public boolean isConcurrentMarkSweepThread() { return false; } |
| public boolean isServiceThread() { 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; } |
| } |