1 /*
2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * 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.linux_x86.LinuxX86JavaThreadPDAccess;
36 import sun.jvm.hotspot.runtime.linux_amd64.LinuxAMD64JavaThreadPDAccess;
37 import sun.jvm.hotspot.runtime.linux_sparc.LinuxSPARCJavaThreadPDAccess;
38 import sun.jvm.hotspot.runtime.bsd_x86.BsdX86JavaThreadPDAccess;
39 import sun.jvm.hotspot.runtime.bsd_amd64.BsdAMD64JavaThreadPDAccess;
40 import sun.jvm.hotspot.utilities.*;
41
42 public class Threads {
43 private static JavaThreadFactory threadFactory;
44 private static AddressField threadListField;
45 private static CIntegerField numOfThreadsField;
46 private static VirtualConstructor virtualConstructor;
47 private static JavaThreadPDAccess access;
48
49 static {
50 VM.registerVMInitializedObserver(new Observer() {
51 public void update(Observable o, Object data) {
52 initialize(VM.getVM().getTypeDataBase());
53 }
54 });
55 }
56
57 private static synchronized void initialize(TypeDataBase db) {
58 Type type = db.lookupType("Threads");
59
60 threadListField = type.getAddressField("_thread_list");
61 numOfThreadsField = type.getCIntegerField("_number_of_threads");
62
63 // Instantiate appropriate platform-specific JavaThreadFactory
64 String os = VM.getVM().getOS();
65 String cpu = VM.getVM().getCPU();
66
67 access = null;
68 // FIXME: find the platform specific PD class by reflection?
69 if (os.equals("solaris")) {
70 if (cpu.equals("sparc")) {
71 access = new SolarisSPARCJavaThreadPDAccess();
72 } else if (cpu.equals("x86")) {
73 access = new SolarisX86JavaThreadPDAccess();
74 } else if (cpu.equals("amd64")) {
75 access = new SolarisAMD64JavaThreadPDAccess();
76 }
77 } else if (os.equals("win32")) {
78 if (cpu.equals("x86")) {
79 access = new Win32X86JavaThreadPDAccess();
80 } else if (cpu.equals("amd64")) {
81 access = new Win32AMD64JavaThreadPDAccess();
82 }
83 } else if (os.equals("linux")) {
84 if (cpu.equals("x86")) {
85 access = new LinuxX86JavaThreadPDAccess();
86 } else if (cpu.equals("amd64")) {
87 access = new LinuxAMD64JavaThreadPDAccess();
88 } else if (cpu.equals("sparc")) {
89 access = new LinuxSPARCJavaThreadPDAccess();
90 } else {
91 try {
92 access = (JavaThreadPDAccess)
93 Class.forName("sun.jvm.hotspot.runtime.linux_" +
94 cpu.toLowerCase() + ".Linux" + cpu.toUpperCase() +
95 "JavaThreadPDAccess").newInstance();
96 } catch (Exception e) {
97 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
98 " not yet supported");
99 }
100 }
101 } else if (os.equals("bsd")) {
102 if (cpu.equals("x86")) {
103 access = new BsdX86JavaThreadPDAccess();
104 } else if (cpu.equals("amd64") || cpu.equals("x86_64")) {
105 access = new BsdAMD64JavaThreadPDAccess();
106 }
107 } else if (os.equals("darwin")) {
108 if (cpu.equals("amd64") || cpu.equals("x86_64")) {
109 access = new BsdAMD64JavaThreadPDAccess();
110 }
111 }
112
113 if (access == null) {
114 throw new RuntimeException("OS/CPU combination " + os + "/" + cpu +
115 " not yet supported");
116 }
117
118 virtualConstructor = new VirtualConstructor(db);
119 // Add mappings for all known thread types
120 virtualConstructor.addMapping("JavaThread", JavaThread.class);
121 if (!VM.getVM().isCore()) {
122 virtualConstructor.addMapping("CompilerThread", CompilerThread.class);
123 }
124 // for now, use JavaThread itself. fix it later with appropriate class if needed
125 virtualConstructor.addMapping("SurrogateLockerThread", JavaThread.class);
126 virtualConstructor.addMapping("JvmtiAgentThread", JvmtiAgentThread.class);
127 virtualConstructor.addMapping("ServiceThread", ServiceThread.class);
128 }
129
130 public Threads() {
131 }
132
133 /** NOTE: this returns objects of type JavaThread, CompilerThread,
134 JvmtiAgentThread, and ServiceThread.
135 The latter four are subclasses of the former. Most operations
136 (fetching the top frame, etc.) are only allowed to be performed on
137 a "pure" JavaThread. For this reason, {@link
138 sun.jvm.hotspot.runtime.JavaThread#isJavaThread} has been
139 changed from the definition in the VM (which returns true for
140 all of these thread types) to return true for JavaThreads and
141 false for the three subclasses. FIXME: should reconsider the
142 inheritance hierarchy; see {@link
143 sun.jvm.hotspot.runtime.JavaThread#isJavaThread}. */
144 public JavaThread first() {
145 Address threadAddr = threadListField.getValue();
146 if (threadAddr == null) {
147 return null;
148 }
149
150 return createJavaThreadWrapper(threadAddr);
151 }
152
153 public int getNumberOfThreads() {
154 return (int) numOfThreadsField.getValue();
155 }
156
157 /** Routine for instantiating appropriately-typed wrapper for a
158 JavaThread. Currently needs to be public for OopUtilities to
159 access it. */
160 public JavaThread createJavaThreadWrapper(Address threadAddr) {
161 try {
162 JavaThread thread = (JavaThread)virtualConstructor.instantiateWrapperFor(threadAddr);
163 thread.setThreadPDAccess(access);
164 return thread;
165 } catch (Exception e) {
166 throw new RuntimeException("Unable to deduce type of thread from address " + threadAddr +
167 " (expected type JavaThread, CompilerThread, ServiceThread, JvmtiAgentThread, or SurrogateLockerThread)", e);
168 }
169 }
170
171 /** Memory operations */
172 public void oopsDo(AddressVisitor oopVisitor) {
173 // FIXME: add more of VM functionality
174 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
175 thread.oopsDo(oopVisitor);
176 }
177 }
178
179 // refer to Threads::owning_thread_from_monitor_owner
180 public JavaThread owningThreadFromMonitor(Address o) {
181 if (o == null) return null;
182 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
183 if (o.equals(thread.threadObjectAddress())) {
184 return thread;
185 }
186 }
187
188 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
189 if (thread.isLockOwned(o))
190 return thread;
191 }
192 return null;
193 }
194
195 public JavaThread owningThreadFromMonitor(ObjectMonitor monitor) {
196 return owningThreadFromMonitor(monitor.owner());
197 }
198
199 // refer to Threads::get_pending_threads
200 // Get list of Java threads that are waiting to enter the specified monitor.
201 public List getPendingThreads(ObjectMonitor monitor) {
202 List pendingThreads = new ArrayList();
203 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
204 if (thread.isCompilerThread()) {
205 continue;
206 }
207 ObjectMonitor pending = thread.getCurrentPendingMonitor();
208 if (monitor.equals(pending)) {
209 pendingThreads.add(thread);
210 }
211 }
212 return pendingThreads;
213 }
214
215 // Get list of Java threads that have called Object.wait on the specified monitor.
216 public List getWaitingThreads(ObjectMonitor monitor) {
217 List pendingThreads = new ArrayList();
218 for (JavaThread thread = first(); thread != null; thread = thread.next()) {
219 ObjectMonitor waiting = thread.getCurrentWaitingMonitor();
220 if (monitor.equals(waiting)) {
221 pendingThreads.add(thread);
222 }
223 }
224 return pendingThreads;
225 }
226
227 // FIXME: add other accessors
228 }