Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/runtime/Thread.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | b9fba36710f2 |
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-1:000000000000 | 0:a61af66fc99e |
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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 } |