|
0
|
1 /*
|
|
|
2 * Copyright 2000-2007 Sun Microsystems, Inc. All Rights Reserved.
|
|
|
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
|
4 *
|
|
|
5 * This code is free software; you can redistribute it and/or modify it
|
|
|
6 * under the terms of the GNU General Public License version 2 only, as
|
|
|
7 * published by the Free Software Foundation.
|
|
|
8 *
|
|
|
9 * This code is distributed in the hope that it will be useful, but WITHOUT
|
|
|
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
|
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
|
12 * version 2 for more details (a copy is included in the LICENSE file that
|
|
|
13 * accompanied this code).
|
|
|
14 *
|
|
|
15 * You should have received a copy of the GNU General Public License version
|
|
|
16 * 2 along with this work; if not, write to the Free Software Foundation,
|
|
|
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
|
18 *
|
|
|
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
|
|
20 * CA 95054 USA or visit www.sun.com if you need additional information or
|
|
|
21 * have any questions.
|
|
|
22 *
|
|
|
23 */
|
|
|
24
|
|
|
25 package sun.jvm.hotspot.runtime;
|
|
|
26
|
|
|
27 import java.util.*;
|
|
|
28 import sun.jvm.hotspot.debugger.*;
|
|
|
29 import sun.jvm.hotspot.types.*;
|
|
|
30
|
|
|
31 public class Thread extends VMObject {
|
|
|
32 private static long tlabFieldOffset;
|
|
|
33
|
|
|
34 private static CIntegerField suspendFlagsField;
|
|
|
35 // Thread::SuspendFlags enum constants
|
|
|
36 private static int EXTERNAL_SUSPEND;
|
|
|
37 private static int EXT_SUSPENDED;
|
|
|
38 private static int HAS_ASYNC_EXCEPTION;
|
|
|
39
|
|
|
40 private static AddressField activeHandlesField;
|
|
|
41 private static AddressField highestLockField;
|
|
|
42 private static AddressField currentPendingMonitorField;
|
|
|
43 private static AddressField currentWaitingMonitorField;
|
|
|
44
|
|
|
45 static {
|
|
|
46 VM.registerVMInitializedObserver(new Observer() {
|
|
|
47 public void update(Observable o, Object data) {
|
|
|
48 initialize(VM.getVM().getTypeDataBase());
|
|
|
49 }
|
|
|
50 });
|
|
|
51 }
|
|
|
52
|
|
|
53 private static synchronized void initialize(TypeDataBase db) {
|
|
|
54 Type type = db.lookupType("Thread");
|
|
|
55
|
|
|
56 suspendFlagsField = type.getCIntegerField("_suspend_flags");
|
|
|
57 EXTERNAL_SUSPEND = db.lookupIntConstant("Thread::_external_suspend").intValue();
|
|
|
58 EXT_SUSPENDED = db.lookupIntConstant("Thread::_ext_suspended").intValue();
|
|
|
59 HAS_ASYNC_EXCEPTION = db.lookupIntConstant("Thread::_has_async_exception").intValue();
|
|
|
60
|
|
|
61 tlabFieldOffset = type.getField("_tlab").getOffset();
|
|
|
62 activeHandlesField = type.getAddressField("_active_handles");
|
|
|
63 highestLockField = type.getAddressField("_highest_lock");
|
|
|
64 currentPendingMonitorField = type.getAddressField("_current_pending_monitor");
|
|
|
65 currentWaitingMonitorField = type.getAddressField("_current_waiting_monitor");
|
|
|
66 }
|
|
|
67
|
|
|
68 public Thread(Address addr) {
|
|
|
69 super(addr);
|
|
|
70 }
|
|
|
71
|
|
|
72 public int suspendFlags() {
|
|
|
73 return (int) suspendFlagsField.getValue(addr);
|
|
|
74 }
|
|
|
75
|
|
|
76 public boolean isExternalSuspend() {
|
|
|
77 return (suspendFlags() & EXTERNAL_SUSPEND) != 0;
|
|
|
78 }
|
|
|
79
|
|
|
80 public boolean isExtSuspended() {
|
|
|
81 return (suspendFlags() & EXT_SUSPENDED) != 0;
|
|
|
82 }
|
|
|
83
|
|
|
84 public boolean isBeingExtSuspended() {
|
|
|
85 return isExtSuspended() || isExternalSuspend();
|
|
|
86 }
|
|
|
87
|
|
|
88 // historical usage: checked for VM or external suspension
|
|
|
89 public boolean isAnySuspended() {
|
|
|
90 return isExtSuspended();
|
|
|
91 }
|
|
|
92
|
|
|
93 public boolean hasAsyncException() {
|
|
|
94 return (suspendFlags() & HAS_ASYNC_EXCEPTION) != 0;
|
|
|
95 }
|
|
|
96
|
|
|
97 public ThreadLocalAllocBuffer tlab() {
|
|
|
98 return new ThreadLocalAllocBuffer(addr.addOffsetTo(tlabFieldOffset));
|
|
|
99 }
|
|
|
100
|
|
|
101 public JNIHandleBlock activeHandles() {
|
|
|
102 Address a = activeHandlesField.getAddress(addr);
|
|
|
103 if (a == null) {
|
|
|
104 return null;
|
|
|
105 }
|
|
|
106 return new JNIHandleBlock(a);
|
|
|
107 }
|
|
|
108
|
|
|
109 public boolean isVMThread() { return false; }
|
|
|
110 public boolean isJavaThread() { return false; }
|
|
|
111 public boolean isCompilerThread() { return false; }
|
|
|
112 public boolean isHiddenFromExternalView() { return false; }
|
|
|
113 public boolean isJvmtiAgentThread() { return false; }
|
|
|
114 public boolean isWatcherThread() { return false; }
|
|
|
115 public boolean isConcurrentMarkSweepThread() { return false; }
|
|
|
116 public boolean isLowMemoryDetectorThread() { return false; }
|
|
|
117
|
|
|
118 /** Memory operations */
|
|
|
119 public void oopsDo(AddressVisitor oopVisitor) {
|
|
|
120 // FIXME: Empty for now; will later traverse JNI handles and
|
|
|
121 // pending exception
|
|
|
122 }
|
|
|
123
|
|
|
124 public Address highestLock() {
|
|
|
125 return highestLockField.getValue(addr);
|
|
|
126 }
|
|
|
127
|
|
|
128 public ObjectMonitor getCurrentPendingMonitor() {
|
|
|
129 Address monitorAddr = currentPendingMonitorField.getValue(addr);
|
|
|
130 if (monitorAddr == null) {
|
|
|
131 return null;
|
|
|
132 }
|
|
|
133 return new ObjectMonitor(monitorAddr);
|
|
|
134 }
|
|
|
135
|
|
|
136 public ObjectMonitor getCurrentWaitingMonitor() {
|
|
|
137 Address monitorAddr = currentWaitingMonitorField.getValue(addr);
|
|
|
138 if (monitorAddr == null) {
|
|
|
139 return null;
|
|
|
140 }
|
|
|
141 return new ObjectMonitor(monitorAddr);
|
|
|
142 }
|
|
|
143
|
|
|
144 public boolean isLockOwned(Address lock) {
|
|
|
145 if (isInStack(lock)) return true;
|
|
|
146 return false;
|
|
|
147 }
|
|
|
148
|
|
|
149 public boolean isInStack(Address a) {
|
|
|
150 // In the Serviceability Agent we need access to the thread's
|
|
|
151 // stack pointer to be able to answer this question. Since it is
|
|
|
152 // only a debugging system at the moment we need access to the
|
|
|
153 // underlying thread, which is only present for Java threads; see
|
|
|
154 // JavaThread.java.
|
|
|
155 return false;
|
|
|
156 }
|
|
|
157
|
|
|
158 /** Assistance for ObjectMonitor implementation */
|
|
|
159 Address threadObjectAddress() { return addr; }
|
|
|
160 }
|
