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 import sun.jvm.hotspot.runtime.solaris_sparc.SolarisSPARCJavaThreadPDAccess;
31 import sun.jvm.hotspot.runtime.solaris_x86.SolarisX86JavaThreadPDAccess;
32 import sun.jvm.hotspot.runtime.solaris_amd64.SolarisAMD64JavaThreadPDAccess;
33 import sun.jvm.hotspot.runtime.win32_amd64.Win32AMD64JavaThreadPDAccess;
34 import sun.jvm.hotspot.runtime.win32_x86.Win32X86JavaThreadPDAccess;
35 import sun.jvm.hotspot.runtime.win32_ia64.Win32IA64JavaThreadPDAccess;
36 import sun.jvm.hotspot.runtime.linux_x86.LinuxX86JavaThreadPDAccess;
37 import sun.jvm.hotspot.runtime.linux_ia64.LinuxIA64JavaThreadPDAccess;
38 import sun.jvm.hotspot.runtime.linux_amd64.LinuxAMD64JavaThreadPDAccess;
39 import sun.jvm.hotspot.runtime.linux_sparc.LinuxSPARCJavaThreadPDAccess;
40 import sun.jvm.hotspot.utilities.*;
41
42 public class Threads {
43 private static JavaThreadFactory threadFactory;
44 private static AddressField threadListField;
45 private static VirtualConstructor virtualConstructor;
46 private static JavaThreadPDAccess access;
47
48 static {
49 VM.registerVMInitializedObserver(new Observer() {
50 public void update(Observable o, Object data) {
51 initialize(VM.getVM().getTypeDataBase());
52 }
53 });
54 }
55
56 private static synchronized void initialize(TypeDataBase db) {
57 Type type = db.lookupType("Threads");
58
59 threadListField = type.getAddressField("_thread_list");
60
61 // Instantiate appropriate platform-specific JavaThreadFactory
62 String os = VM.getVM().getOS();
63 String cpu = VM.getVM().getCPU();
64
65 access = null;
66 // FIXME: find the platform specific PD class by reflection?
67 if (os.equals("solaris")) {
68 if (cpu.equals("sparc")) {
69 access = new SolarisSPARCJavaThreadPDAccess();
70 } else if (cpu.equals("x86")) {
71 access = new SolarisX86JavaThreadPDAccess();
72 } else if (cpu.equals("amd64")) {
73 access = new SolarisAMD64JavaThreadPDAccess();
74 }
75 } else if (os.equals("win32")) {
76 if (cpu.equals("x86")) {
77 access = new Win32X86JavaThreadPDAccess();
78 } else if (cpu.equals("amd64")) {
79 access = new Win32AMD64JavaThreadPDAccess();
80 } else if (cpu.equals("ia64")) {
81 access = new Win32IA64JavaThreadPDAccess();
82 }
83 } else if (os.equals("linux")) {
84 if (cpu.equals("x86")) {
85 access = new LinuxX86JavaThreadPDAccess();
86 } else if (cpu.equals("ia64")) {
87 access = new LinuxIA64JavaThreadPDAccess();
88 } else if (cpu.equals("amd64")) {
89 access = new LinuxAMD64JavaThreadPDAccess();
90 } else if (cpu.equals("sparc")) {
91 access = new LinuxSPARCJavaThreadPDAccess();
92 }
93
94 }
95
96 if (access == null) {
97 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
98 " not yet supported");
99 }
100
101 virtualConstructor = new VirtualConstructor(db);
102 // Add mappings for all known thread types
103 virtualConstructor.addMapping("JavaThread", JavaThread.class);
104 if (!VM.getVM().isCore()) {
105 virtualConstructor.addMapping("CompilerThread", CompilerThread.class);
106 }
107 // for now, use JavaThread itself. fix it later with appropriate class if needed
108 virtualConstructor.addMapping("SurrogateLockerThread", JavaThread.class);
109 virtualConstructor.addMapping("JvmtiAgentThread", JvmtiAgentThread.class);
110 virtualConstructor.addMapping("LowMemoryDetectorThread", LowMemoryDetectorThread.class);
111 }
112
113 public Threads() {
114 }
115
116 /** NOTE: this returns objects of type JavaThread, CompilerThread,
117 JvmtiAgentThread, and LowMemoryDetectorThread.
118 The latter four are subclasses of the former. Most operations
119 (fetching the top frame, etc.) are only allowed to be performed on
120 a "pure" JavaThread. For this reason, {@link
121 sun.jvm.hotspot.runtime.JavaThread#isJavaThread} has been
122 changed from the definition in the VM (which returns true for
123 all of these thread types) to return true for JavaThreads and
124 false for the three subclasses. FIXME: should reconsider the
125 inheritance hierarchy; see {@link
126 sun.jvm.hotspot.runtime.JavaThread#isJavaThread}. */
127 public JavaThread first() {
128 Address threadAddr = threadListField.getValue();
129 if (threadAddr == null) {
130 return null;
131 }
132
133 return createJavaThreadWrapper(threadAddr);
134 }
135
136 /** Routine for instantiating appropriately-typed wrapper for a
137 JavaThread. Currently needs to be public for OopUtilities to
138 access it. */
139 public JavaThread createJavaThreadWrapper(Address threadAddr) {
140 try {
141 JavaThread thread = (JavaThread)virtualConstructor.instantiateWrapperFor(threadAddr);
142 thread.setThreadPDAccess(access);
143 return thread;
144 } catch (Exception e) {
145 throw new RuntimeException("Unable to deduce type of thread from address " + threadAddr +
146 " (expected type JavaThread, CompilerThread, LowMemoryDetectorThread, JvmtiAgentThread, or SurrogateLockerThread)", e);
147 }
148 }
149
150 /** Memory operations */
151 public void oopsDo(AddressVisitor oopVisitor) {
152 // FIXME: add more of VM functionality
153 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
154 thread.oopsDo(oopVisitor);
155 }
156 }
157
158 // refer to Threads::owning_thread_from_monitor_owner
159 public JavaThread owningThreadFromMonitor(Address o) {
160 if (o == null) return null;
161 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
162 if (o.equals(thread.threadObjectAddress())) {
163 return thread;
164 }
165 }
166
167 long leastDiff = 0;
168 boolean leastDiffInitialized = false;
169 JavaThread theOwner = null;
170 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
171 Address addr = thread.highestLock();
172 if (addr == null || addr.lessThan(o)) continue;
173 long diff = addr.minus(o);
174 if (!leastDiffInitialized || diff < leastDiff) {
175 leastDiffInitialized = true;
176 leastDiff = diff;
177 theOwner = thread;
178 }
179 }
180 return theOwner;
181 }
182
183 public JavaThread owningThreadFromMonitor(ObjectMonitor monitor) {
184 return owningThreadFromMonitor(monitor.owner());
185 }
186
187 // refer to Threads::get_pending_threads
188 // Get list of Java threads that are waiting to enter the specified monitor.
189 public List getPendingThreads(ObjectMonitor monitor) {
190 List pendingThreads = new ArrayList();
191 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
192 if (thread.isCompilerThread()) {
193 continue;
194 }
195 ObjectMonitor pending = thread.getCurrentPendingMonitor();
196 if (monitor.equals(pending)) {
197 pendingThreads.add(thread);
198 }
199 }
200 return pendingThreads;
201 }
202
203 // Get list of Java threads that have called Object.wait on the specified monitor.
204 public List getWaitingThreads(ObjectMonitor monitor) {
205 List pendingThreads = new ArrayList();
206 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
207 ObjectMonitor waiting = thread.getCurrentWaitingMonitor();
208 if (monitor.equals(waiting)) {
209 pendingThreads.add(thread);
210 }
211 }
212 return pendingThreads;
213 }
214
215 // FIXME: add other accessors
216 }