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1 /* |
1 /* |
2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved. |
2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * |
4 * |
5 * This code is free software; you can redistribute it and/or modify it |
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 |
6 * under the terms of the GNU General Public License version 2 only, as |
7 * published by the Free Software Foundation. Oracle designates this |
7 * published by the Free Software Foundation. Oracle designates this |
24 */ |
24 */ |
25 |
25 |
26 package com.sun.tools.jdi; |
26 package com.sun.tools.jdi; |
27 |
27 |
28 import java.lang.ref.WeakReference; |
28 import java.lang.ref.WeakReference; |
29 import java.util.ArrayList; |
29 import java.util.*; |
30 import java.util.Arrays; |
|
31 import java.util.Iterator; |
|
32 import java.util.List; |
|
33 |
30 |
34 import com.sun.jdi.ThreadGroupReference; |
31 import com.sun.jdi.ThreadGroupReference; |
35 import com.sun.jdi.ThreadReference; |
32 import com.sun.jdi.ThreadReference; |
36 import com.sun.jdi.VirtualMachine; |
33 import com.sun.jdi.VirtualMachine; |
37 |
34 |
42 private final List<WeakReference<VMListener>> listeners = new ArrayList<>(); // synchronized (this) |
39 private final List<WeakReference<VMListener>> listeners = new ArrayList<>(); // synchronized (this) |
43 private boolean notifyingListeners = false; // synchronized (this) |
40 private boolean notifyingListeners = false; // synchronized (this) |
44 |
41 |
45 /* |
42 /* |
46 * Certain information can be cached only when the entire VM is |
43 * Certain information can be cached only when the entire VM is |
47 * suspended and there are no pending resumes. The fields below |
44 * suspended and there are no pending resumes. The field below |
48 * are used to track whether there are pending resumes. (There |
45 * is used to track whether there are pending resumes. |
49 * is an assumption that JDWP command ids are increasing over time.) |
46 */ |
50 */ |
47 private final Set<Integer> pendingResumeCommands = Collections.synchronizedSet(new HashSet<>()); |
51 private int lastCompletedCommandId = 0; // synchronized (this) |
|
52 private int lastResumeCommandId = 0; // synchronized (this) |
|
53 |
48 |
54 // This is cached only while the VM is suspended |
49 // This is cached only while the VM is suspended |
55 private static class Cache { |
50 private static class Cache { |
56 List<ThreadGroupReference> groups = null; // cached Top Level ThreadGroups |
51 List<ThreadGroupReference> groups = null; // cached Top Level ThreadGroups |
57 List<ThreadReference> threads = null; // cached Threads |
52 List<ThreadReference> threads = null; // cached Threads |
95 |
90 |
96 /* |
91 /* |
97 * A JDWP command has been completed (reply has been received). |
92 * A JDWP command has been completed (reply has been received). |
98 * Update data that tracks pending resume commands. |
93 * Update data that tracks pending resume commands. |
99 */ |
94 */ |
100 synchronized void notifyCommandComplete(int id) { |
95 void notifyCommandComplete(int id) { |
101 lastCompletedCommandId = id; |
96 pendingResumeCommands.remove(id); |
102 } |
97 } |
103 |
98 |
104 synchronized void freeze() { |
99 synchronized void freeze() { |
105 if (cache == null && (lastCompletedCommandId >= lastResumeCommandId)) { |
100 if (cache == null && (pendingResumeCommands.isEmpty())) { |
106 /* |
101 /* |
107 * No pending resumes to worry about. The VM is suspended |
102 * No pending resumes to worry about. The VM is suspended |
108 * and additional state can be cached. Notify all |
103 * and additional state can be cached. Notify all |
109 * interested listeners. |
104 * interested listeners. |
110 */ |
105 */ |
113 } |
108 } |
114 } |
109 } |
115 |
110 |
116 synchronized PacketStream thawCommand(CommandSender sender) { |
111 synchronized PacketStream thawCommand(CommandSender sender) { |
117 PacketStream stream = sender.send(); |
112 PacketStream stream = sender.send(); |
118 lastResumeCommandId = stream.id(); |
113 pendingResumeCommands.add(stream.id()); |
119 thaw(); |
114 thaw(); |
120 return stream; |
115 return stream; |
121 } |
116 } |
122 |
117 |
123 /** |
118 /** |