86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "precompiled.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/os.hpp"
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#include "threadHelper.inline.hpp"
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#include "utilities/globalCounter.inline.hpp"
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constexpr const int good_value = 1337;
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constexpr const int bad_value = 4711;
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struct TestData {
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long test_value;
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};
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TEST_VM(GlobalCounter, critical_section) {
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constexpr int number_of_readers = 4;
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volatile bool rt_exit = false;
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Semaphore wrt_start;
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volatile TestData* test = nullptr;
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auto rcu_reader = [&](Thread* current, int _id) {
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volatile TestData** _test = &test;
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wrt_start.signal();
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while (!rt_exit) {
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GlobalCounter::CSContext cs_context = GlobalCounter::critical_section_begin(current);
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volatile TestData* read_test = Atomic::load_acquire(_test);
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long value = Atomic::load_acquire(&read_test->test_value);
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ASSERT_EQ(value, good_value);
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GlobalCounter::critical_section_end(current, cs_context);
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{
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GlobalCounter::CriticalSection cs(current);
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volatile TestData* test = Atomic::load_acquire(_test);
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long value = Atomic::load_acquire(&test->test_value);
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ASSERT_EQ(value, good_value);
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}
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}
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};
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TestThreadGroup<decltype(rcu_reader)> ttg(rcu_reader, number_of_readers);
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TestData* tmp = new TestData();
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tmp->test_value = good_value;
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Atomic::release_store(&test, tmp);
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rt_exit = false;
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ttg.doit();
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int nw = number_of_readers;
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while (nw > 0) {
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wrt_start.wait();
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--nw;
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}
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jlong stop_ms = os::javaTimeMillis() + 1000; // 1 seconds max test time
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for (int i = 0; i < 100000 && stop_ms > os::javaTimeMillis(); i++) {
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volatile TestData* free_tmp = test;
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tmp = new TestData();
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tmp->test_value = good_value;
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Atomic::release_store(&test, tmp);
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GlobalCounter::write_synchronize();
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free_tmp->test_value = bad_value;
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delete free_tmp;
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}
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rt_exit = true;
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ttg.join();
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}
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