| /* |
| * Copyright (c) 2018, 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 "runtime/interfaceSupport.inline.hpp" |
| #include "runtime/orderAccess.hpp" |
| #include "runtime/os.hpp" |
| #include "runtime/thread.hpp" |
| #include "utilities/debug.hpp" |
| #include "utilities/globalCounter.inline.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| #include "utilities/ostream.hpp" |
| #include "utilities/singleWriterSynchronizer.hpp" |
| #include "utilitiesHelper.inline.hpp" |
| #include "unittest.hpp" |
| |
| class SingleWriterSynchronizerTestReader : public JavaTestThread { |
| SingleWriterSynchronizer* _synchronizer; |
| volatile uintx* _synchronized_value; |
| volatile int* _continue_running; |
| |
| static const uint reader_iterations = 10; |
| |
| public: |
| SingleWriterSynchronizerTestReader(Semaphore* post, |
| SingleWriterSynchronizer* synchronizer, |
| volatile uintx* synchronized_value, |
| volatile int* continue_running) : |
| JavaTestThread(post), |
| _synchronizer(synchronizer), |
| _synchronized_value(synchronized_value), |
| _continue_running(continue_running) |
| {} |
| |
| virtual void main_run() { |
| uintx iterations = 0; |
| while (OrderAccess::load_acquire(_continue_running) != 0) { |
| ++iterations; |
| SingleWriterSynchronizer::CriticalSection cs(_synchronizer); |
| uintx value = OrderAccess::load_acquire(_synchronized_value); |
| for (uint i = 0; i < reader_iterations; ++i) { |
| uintx new_value = OrderAccess::load_acquire(_synchronized_value); |
| // A reader can see either the value it first read after |
| // entering the critical section, or that value + 1. No other |
| // values are possible. |
| if (value != new_value) { |
| ASSERT_EQ((value + 1), new_value); |
| } |
| } |
| } |
| tty->print_cr("reader iterations: " UINTX_FORMAT, iterations); |
| } |
| }; |
| |
| class SingleWriterSynchronizerTestWriter : public JavaTestThread { |
| SingleWriterSynchronizer* _synchronizer; |
| volatile uintx* _synchronized_value; |
| volatile int* _continue_running; |
| |
| public: |
| SingleWriterSynchronizerTestWriter(Semaphore* post, |
| SingleWriterSynchronizer* synchronizer, |
| volatile uintx* synchronized_value, |
| volatile int* continue_running) : |
| JavaTestThread(post), |
| _synchronizer(synchronizer), |
| _synchronized_value(synchronized_value), |
| _continue_running(continue_running) |
| {} |
| |
| virtual void main_run() { |
| while (OrderAccess::load_acquire(_continue_running) != 0) { |
| ++*_synchronized_value; |
| _synchronizer->synchronize(); |
| } |
| tty->print_cr("writer iterations: " UINTX_FORMAT, *_synchronized_value); |
| } |
| }; |
| |
| const uint nreaders = 5; |
| const uint milliseconds_to_run = 3000; |
| |
| TEST_VM(TestSingleWriterSynchronizer, stress) { |
| Semaphore post; |
| SingleWriterSynchronizer synchronizer; |
| volatile uintx synchronized_value = 0; |
| volatile int continue_running = 1; |
| |
| JavaTestThread* readers[nreaders] = {}; |
| for (uint i = 0; i < nreaders; ++i) { |
| readers[i] = new SingleWriterSynchronizerTestReader(&post, |
| &synchronizer, |
| &synchronized_value, |
| &continue_running); |
| readers[i]->doit(); |
| } |
| |
| JavaTestThread* writer = |
| new SingleWriterSynchronizerTestWriter(&post, |
| &synchronizer, |
| &synchronized_value, |
| &continue_running); |
| |
| writer->doit(); |
| |
| tty->print_cr("Stressing synchronizer for %u ms", milliseconds_to_run); |
| { |
| ThreadInVMfromNative invm(JavaThread::current()); |
| os::sleep(Thread::current(), milliseconds_to_run, true); |
| } |
| continue_running = 0; |
| for (uint i = 0; i < nreaders + 1; ++i) { |
| post.wait(); |
| } |
| } |