1 /*
2 * Copyright (c) 2023, 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
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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
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 */
23
24 /**
25 * @test
26 * @bug 8312174
27 * @summary missing JVMTI events from vthreads parked during JVMTI attach
28 * @requires vm.continuations
29 * @requires vm.jvmti
30 * @requires vm.compMode != "Xcomp"
31 * @modules java.base/java.lang:+open
32 * @library /test/lib
33 * @run main/othervm/native
34 * -Djdk.attach.allowAttachSelf=true -XX:+EnableDynamicAgentLoading VThreadEventTest attach
35 */
36
37 import com.sun.tools.attach.VirtualMachine;
38 import java.util.concurrent.atomic.AtomicBoolean;
39 import java.util.concurrent.locks.LockSupport;
40 import java.util.List;
41 import java.util.ArrayList;
42 import jdk.test.lib.thread.VThreadRunner;
43
44 public class VThreadEventTest {
45 static final int PARKED_THREAD_COUNT = 4;
46 static final int SPINNING_THREAD_COUNT = 4;
47
48 private static void log(String msg) { System.out.println(msg); }
49
50 private static native int threadEndCount();
51 private static native int threadMountCount();
52 private static native int threadUnmountCount();
53
54 private static volatile boolean attached;
55
56 // called by agent when it is initialized and has enabled events
57 static void agentStarted() {
58 attached = true;
59 }
60
61 public static void main(String[] args) throws Exception {
62 VThreadRunner.ensureParallelism(SPINNING_THREAD_COUNT+1);
63
64 // start threads that park (unmount)
65 var threads1 = new ArrayList<Thread>();
66 for (int i = 0; i < PARKED_THREAD_COUNT; i++) {
67 var started = new AtomicBoolean();
68 var thread = Thread.startVirtualThread(() -> {
69 started.set(true);
70 LockSupport.park();
71 });
72
73 // wait for thread to start execution + park
74 while (!started.get()) {
75 Thread.sleep(10);
76 }
77 await(thread, Thread.State.WAITING);
78 threads1.add(thread);
79 }
80
81 // start threads that spin (stay mounted)
82 var threads2 = new ArrayList<Thread>();
83 for (int i = 0; i < SPINNING_THREAD_COUNT; i++) {
84 var started = new AtomicBoolean();
85 var thread = Thread.startVirtualThread(() -> {
86 started.set(true);
87 while (!attached) {
88 Thread.onSpinWait();
89 }
90 });
91
92 // wait for thread to start execution
93 while (!started.get()) {
94 Thread.sleep(10);
95 }
96 threads2.add(thread);
97 }
98
99 // attach to the current VM
100 VirtualMachine vm = VirtualMachine.attach(String.valueOf(ProcessHandle.current().pid()));
101 vm.loadAgentLibrary("VThreadEventTest");
102
103 // wait for agent to start
104 while (!attached) {
105 Thread.sleep(10);
106 }
107
108 // unpark the threads that were parked
109 for (Thread thread : threads1) {
110 LockSupport.unpark(thread);
111 }
112
113 // wait for all threads to terminate
114 for (Thread thread : threads1) {
115 thread.join();
116 }
117 for (Thread thread : threads2) {
118 thread.join();
119 }
120
121 int threadEndCnt = threadEndCount();
122 int threadMountCnt = threadMountCount();
123 int threadUnmountCnt = threadUnmountCount();
124
125 int threadCount = PARKED_THREAD_COUNT + SPINNING_THREAD_COUNT;
126 log("VirtualThreadEnd events: " + threadEndCnt + ", expected: " + threadCount);
127 log("VirtualThreadMount events: " + threadMountCnt + ", expected: " + PARKED_THREAD_COUNT);
128 log("VirtualThreadUnmount events: " + threadUnmountCnt + ", expected: " + threadCount);
129
130
131 boolean failed = false;
132 if (threadEndCnt != threadCount) {
133 log("FAILED: unexpected count of VirtualThreadEnd events");
134 failed = true;
135 }
136 if (threadMountCnt != PARKED_THREAD_COUNT) {
137 log("FAILED: unexpected count of VirtualThreadMount events");
138 failed = true;
139 }
140 if (threadUnmountCnt != threadCount) {
141 log("FAILED: unexpected count of VirtualThreadUnmount events");
142 failed = true;
143 }
144 if (failed) {
145 throw new RuntimeException("FAILED: event count is wrong");
146 }
147 }
148
149 private static void await(Thread thread, Thread.State expectedState) throws InterruptedException {
150 Thread.State state = thread.getState();
151 while (state != expectedState) {
152 assert state != Thread.State.TERMINATED : "Thread has terminated";
153 Thread.sleep(10);
154 state = thread.getState();
155 }
156 }
157
158 }
159