1 | /* |
2 | * Copyright (c) 2018, 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 | #include "precompiled.hpp" |
25 | #include "runtime/atomic.hpp" |
26 | #include "runtime/orderAccess.hpp" |
27 | #include "runtime/os.hpp" |
28 | #include "utilities/globalCounter.hpp" |
29 | #include "utilities/globalCounter.inline.hpp" |
30 | #include "threadHelper.inline.hpp" |
31 | |
32 | #define GOOD_VALUE 1337 |
33 | #define BAD_VALUE 4711 |
34 | |
35 | struct TestData { |
36 | long test_value; |
37 | }; |
38 | |
39 | class RCUReaderThread : public JavaTestThread { |
40 | public: |
41 | static volatile bool _exit; |
42 | volatile TestData** _test; |
43 | Semaphore* _wrt_start; |
44 | RCUReaderThread(Semaphore* post, volatile TestData** test, Semaphore* wrt_start) |
45 | : JavaTestThread(post), _test(test), _wrt_start(wrt_start) {}; |
46 | virtual ~RCUReaderThread(){} |
47 | void main_run() { |
48 | _wrt_start->signal(); |
49 | while (!_exit) { |
50 | GlobalCounter::CSContext cs_context = GlobalCounter::critical_section_begin(this); |
51 | volatile TestData* test = OrderAccess::load_acquire(_test); |
52 | long value = OrderAccess::load_acquire(&test->test_value); |
53 | ASSERT_EQ(value, GOOD_VALUE); |
54 | GlobalCounter::critical_section_end(this, cs_context); |
55 | { |
56 | GlobalCounter::CriticalSection cs(this); |
57 | volatile TestData* test = OrderAccess::load_acquire(_test); |
58 | long value = OrderAccess::load_acquire(&test->test_value); |
59 | ASSERT_EQ(value, GOOD_VALUE); |
60 | } |
61 | } |
62 | } |
63 | }; |
64 | |
65 | volatile bool RCUReaderThread::_exit = false; |
66 | |
67 | class RCUWriterThread : public JavaTestThread { |
68 | public: |
69 | RCUWriterThread(Semaphore* post) : JavaTestThread(post) { |
70 | }; |
71 | virtual ~RCUWriterThread(){} |
72 | void main_run() { |
73 | static const int NUMBER_OF_READERS = 4; |
74 | Semaphore post; |
75 | Semaphore wrt_start; |
76 | volatile TestData* test = NULL; |
77 | |
78 | RCUReaderThread* reader1 = new RCUReaderThread(&post, &test, &wrt_start); |
79 | RCUReaderThread* reader2 = new RCUReaderThread(&post, &test, &wrt_start); |
80 | RCUReaderThread* reader3 = new RCUReaderThread(&post, &test, &wrt_start); |
81 | RCUReaderThread* reader4 = new RCUReaderThread(&post, &test, &wrt_start); |
82 | |
83 | TestData* tmp = new TestData(); |
84 | tmp->test_value = GOOD_VALUE; |
85 | OrderAccess::release_store_fence(&test, tmp); |
86 | |
87 | reader1->doit(); |
88 | reader2->doit(); |
89 | reader3->doit(); |
90 | reader4->doit(); |
91 | |
92 | int nw = NUMBER_OF_READERS; |
93 | while (nw > 0) { |
94 | wrt_start.wait(); |
95 | --nw; |
96 | } |
97 | jlong stop_ms = os::javaTimeMillis() + 1000; // 1 seconds max test time |
98 | for (int i = 0; i < 100000 && stop_ms > os::javaTimeMillis(); i++) { |
99 | volatile TestData* free_tmp = test; |
100 | tmp = new TestData(); |
101 | tmp->test_value = GOOD_VALUE; |
102 | OrderAccess::release_store(&test, tmp); |
103 | GlobalCounter::write_synchronize(); |
104 | free_tmp->test_value = BAD_VALUE; |
105 | delete free_tmp; |
106 | } |
107 | RCUReaderThread::_exit = true; |
108 | for (int i = 0; i < NUMBER_OF_READERS; i++) { |
109 | post.wait(); |
110 | } |
111 | } |
112 | }; |
113 | |
114 | TEST_VM(GlobalCounter, critical_section) { |
115 | RCUReaderThread::_exit = false; |
116 | mt_test_doer<RCUWriterThread>(); |
117 | } |
118 | |