1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*
* Copyright (c) 2019, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "memory/allocation.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/javaThread.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/threads.hpp"
#include "runtime/vmOperations.hpp"
#include "runtime/vmThread.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/ostream.hpp"
#include "unittest.hpp"
struct Threads::Test : public AllStatic {
class VM_TestClaimOverflow;
class CountThreads;
class CheckClaims;
};
class Threads::Test::CountThreads : public ThreadClosure {
uintx _claim_token;
uint _java_threads_count;
uint _non_java_threads_count;
bool _need_claim;
public:
CountThreads(uintx claim_token, bool need_claim) :
_claim_token(claim_token),
_java_threads_count(0),
_non_java_threads_count(0),
_need_claim(need_claim)
{}
virtual void do_thread(Thread* t) {
if (!_need_claim || t->claim_threads_do(true, _claim_token)) {
if (t->is_Java_thread()) {
++_java_threads_count;
} else {
++_non_java_threads_count;
}
}
}
uint java_threads_count() const { return _java_threads_count; }
uint non_java_threads_count() const { return _non_java_threads_count; }
uint count() const { return _java_threads_count + _non_java_threads_count; }
};
class Threads::Test::CheckClaims : public ThreadClosure {
uintx _claim_token;
uint _java_threads_claimed;
uint _java_threads_unclaimed;
uint _non_java_threads_claimed;
uint _non_java_threads_unclaimed;
public:
CheckClaims(uintx claim_token) :
_claim_token(claim_token),
_java_threads_claimed(0),
_java_threads_unclaimed(0),
_non_java_threads_claimed(0),
_non_java_threads_unclaimed(0)
{}
virtual void do_thread(Thread* t) {
uintx thread_token = t->threads_do_token();
if (thread_token == _claim_token) {
if (t->is_Java_thread()) {
++_java_threads_claimed;
} else {
++_non_java_threads_claimed;
}
} else {
if (t->is_Java_thread()) {
++_java_threads_unclaimed;
} else {
++_non_java_threads_unclaimed;
}
}
}
uint java_threads_claimed() const { return _java_threads_claimed; }
uint java_threads_unclaimed() const { return _java_threads_unclaimed; }
uint non_java_threads_claimed() const { return _non_java_threads_claimed; }
uint non_java_threads_unclaimed() const { return _non_java_threads_unclaimed; }
uint claimed() const {
return _java_threads_claimed + _non_java_threads_claimed;
}
uint unclaimed() const {
return _java_threads_unclaimed + _non_java_threads_unclaimed;
}
};
class Threads::Test::VM_TestClaimOverflow : public VM_GTestExecuteAtSafepoint {
public:
void doit() {
// Prevent changes to the NJT list while we're conducting our test.
MutexLocker ml(NonJavaThreadsList_lock, Mutex::_no_safepoint_check_flag);
_thread_claim_token = max_uintx - 1;
ASSERT_EQ(max_uintx - 1, thread_claim_token());
CountThreads count1(thread_claim_token(), true);
threads_do(&count1);
tty->print_cr("Testing claim overflow with %u threads", count1.count());
// At least the main thread and the VM thread.
ASSERT_LE(2u, count1.count());
ASSERT_LE(1u, count1.java_threads_count());
ASSERT_LE(1u, count1.non_java_threads_count());
ASSERT_EQ(max_uintx - 1, thread_claim_token());
CheckClaims check1(thread_claim_token());
threads_do(&check1);
ASSERT_EQ(count1.count(), check1.claimed());
ASSERT_EQ(count1.java_threads_count(), check1.java_threads_claimed());
ASSERT_EQ(0u, check1.java_threads_unclaimed());
ASSERT_EQ(count1.non_java_threads_count(), check1.non_java_threads_claimed());
ASSERT_EQ(0u, check1.non_java_threads_unclaimed());
change_thread_claim_token(); // No overflow yet.
ASSERT_EQ(max_uintx, thread_claim_token());
CountThreads count2(thread_claim_token(), false); // Claimed by PPTD below
possibly_parallel_threads_do(true /* is_par */, &count2);
ASSERT_EQ(count1.java_threads_count(), count2.java_threads_count());
ASSERT_EQ(count1.non_java_threads_count(), count2.non_java_threads_count());
CheckClaims check2(thread_claim_token());
threads_do(&check2);
ASSERT_EQ(count2.java_threads_count(), check2.java_threads_claimed());
ASSERT_EQ(0u, check2.java_threads_unclaimed());
ASSERT_EQ(0u, check2.non_java_threads_unclaimed());
ASSERT_EQ(count1.non_java_threads_count(),
check2.non_java_threads_claimed());
change_thread_claim_token(); // Expect overflow.
ASSERT_EQ(uintx(1), thread_claim_token());
// Verify all threads have claim value of 0 after change overflow.
CheckClaims check3(0);
threads_do(&check3);
ASSERT_EQ(count1.count(), check3.claimed());
ASSERT_EQ(0u, check3.unclaimed());
}
};
// Test overflow handling in Threads::change_thread_claim_token().
TEST_VM(ThreadsTest, claim_overflow) {
Threads::Test::VM_TestClaimOverflow op;
ThreadInVMfromNative invm(JavaThread::current());
VMThread::execute(&op);
}
TEST_VM(ThreadsTest, fast_jni_in_vm) {
JavaThread* current = JavaThread::current();
JNIEnv* env = current->jni_environment();
MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, current));
// DirectByteBuffer is an easy way to trigger GetIntField,
// see JDK-8262896
jlong capacity = 0x10000;
jobject buffer = env->NewDirectByteBuffer(nullptr, (jlong)capacity);
ASSERT_NE((void*)nullptr, buffer);
ASSERT_EQ(capacity, env->GetDirectBufferCapacity(buffer));
}
|
