146 lines
5.2 KiB
C++
146 lines
5.2 KiB
C++
/*
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* Copyright (c) 2018, 2019, 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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*/
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#include "precompiled.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/os.hpp"
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#include "runtime/thread.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/globalCounter.inline.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/ostream.hpp"
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#include "utilities/singleWriterSynchronizer.hpp"
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#include "threadHelper.inline.hpp"
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#include "unittest.hpp"
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class SingleWriterSynchronizerTestReader : public JavaTestThread {
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SingleWriterSynchronizer* _synchronizer;
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volatile uintx* _synchronized_value;
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volatile int* _continue_running;
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static const uint reader_iterations = 10;
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public:
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SingleWriterSynchronizerTestReader(Semaphore* post,
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SingleWriterSynchronizer* synchronizer,
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volatile uintx* synchronized_value,
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volatile int* continue_running) :
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JavaTestThread(post),
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_synchronizer(synchronizer),
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_synchronized_value(synchronized_value),
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_continue_running(continue_running)
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{}
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virtual void main_run() {
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size_t iterations = 0;
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size_t values_changed = 0;
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while (Atomic::load_acquire(_continue_running) != 0) {
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{ ThreadBlockInVM tbiv(this); } // Safepoint check outside critical section.
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++iterations;
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SingleWriterSynchronizer::CriticalSection cs(_synchronizer);
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uintx value = Atomic::load_acquire(_synchronized_value);
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uintx new_value = value;
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for (uint i = 0; i < reader_iterations; ++i) {
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new_value = Atomic::load_acquire(_synchronized_value);
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// A reader can see either the value it first read after
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// entering the critical section, or that value + 1. No other
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// values are possible.
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if (value != new_value) {
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ASSERT_EQ((value + 1), new_value);
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}
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}
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if (value != new_value) {
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++values_changed;
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}
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}
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tty->print_cr("reader iterations: " SIZE_FORMAT ", changes: " SIZE_FORMAT,
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iterations, values_changed);
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}
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};
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class SingleWriterSynchronizerTestWriter : public JavaTestThread {
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SingleWriterSynchronizer* _synchronizer;
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volatile uintx* _synchronized_value;
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volatile int* _continue_running;
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public:
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SingleWriterSynchronizerTestWriter(Semaphore* post,
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SingleWriterSynchronizer* synchronizer,
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volatile uintx* synchronized_value,
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volatile int* continue_running) :
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JavaTestThread(post),
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_synchronizer(synchronizer),
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_synchronized_value(synchronized_value),
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_continue_running(continue_running)
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{}
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virtual void main_run() {
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while (Atomic::load_acquire(_continue_running) != 0) {
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++*_synchronized_value;
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_synchronizer->synchronize();
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{ ThreadBlockInVM tbiv(this); } // Safepoint check.
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}
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tty->print_cr("writer iterations: " UINTX_FORMAT, *_synchronized_value);
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}
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};
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const uint nreaders = 5;
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const uint milliseconds_to_run = 1000;
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TEST_VM(TestSingleWriterSynchronizer, stress) {
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Semaphore post;
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SingleWriterSynchronizer synchronizer;
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volatile uintx synchronized_value = 0;
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volatile int continue_running = 1;
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JavaTestThread* readers[nreaders] = {};
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for (uint i = 0; i < nreaders; ++i) {
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readers[i] = new SingleWriterSynchronizerTestReader(&post,
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&synchronizer,
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&synchronized_value,
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&continue_running);
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readers[i]->doit();
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}
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JavaTestThread* writer =
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new SingleWriterSynchronizerTestWriter(&post,
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&synchronizer,
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&synchronized_value,
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&continue_running);
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writer->doit();
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tty->print_cr("Stressing synchronizer for %u ms", milliseconds_to_run);
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JavaThread* cur = JavaThread::current();
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{
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ThreadInVMfromNative invm(cur);
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cur->sleep(milliseconds_to_run);
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}
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continue_running = 0;
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for (uint i = 0; i < nreaders + 1; ++i) {
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post.wait();
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}
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}
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