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138 lines
3.9 KiB
138 lines
3.9 KiB
/* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/* Simple unit tests for thread id partitioned rwlocks. */
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// First include (the generated) my_config.h, to get correct platform defines.
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#include "my_config.h"
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#include <gtest/gtest.h>
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#include <sys/types.h>
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#include "sql/auth/partitioned_rwlock.h"
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#include "unittest/gunit/thread_utils.h"
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namespace partitioned_rwlock_unittest {
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using thread::Thread;
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TEST(PartitionedRwlock, InitDestroy) {
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Partitioned_rwlock rwlock;
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bool r = rwlock.init(32
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#ifdef HAVE_PSI_INTERFACE
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,
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PSI_NOT_INSTRUMENTED
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#endif
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);
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EXPECT_FALSE(r);
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rwlock.destroy();
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r = rwlock.init(8
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#ifdef HAVE_PSI_INTERFACE
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,
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PSI_NOT_INSTRUMENTED
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#endif
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);
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EXPECT_FALSE(r);
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rwlock.destroy();
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}
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class Reader_thread : public Thread {
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public:
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void init(uint thread_id, Partitioned_rwlock *rwlock,
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volatile uint *shared_counter) {
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m_thread_id = thread_id;
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m_rwlock = rwlock;
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m_shared_counter = shared_counter;
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}
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virtual void run() {
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for (uint i = 0; i < 1000; ++i) {
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Partitioned_rwlock_read_guard lock(m_rwlock, m_thread_id);
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/*
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With correct rwlock implementation readers should not
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observe counter values not divisible by 100.
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*/
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EXPECT_EQ(0U, (*m_shared_counter % 100));
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}
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}
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private:
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uint m_thread_id;
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Partitioned_rwlock *m_rwlock;
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volatile uint *m_shared_counter;
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};
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class Writer_thread : public Thread {
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public:
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Writer_thread(Partitioned_rwlock *rwlock, volatile uint *shared_counter)
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: m_rwlock(rwlock), m_shared_counter(shared_counter) {}
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virtual void run() {
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for (uint i = 0; i < 1000; ++i) {
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Partitioned_rwlock_write_guard lock(m_rwlock);
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/*
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Add 100 to counter value using 100 single increments. We rely
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on counter being "volatile" to prevent compiler optimizations.
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*/
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for (uint j = 0; j < 100; ++j) {
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++*m_shared_counter;
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}
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}
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}
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private:
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Partitioned_rwlock *m_rwlock;
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volatile uint *m_shared_counter;
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};
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/**
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Concurrent test which easily breaks if rwlock implementation is wrong
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(e.g. if wrlock() operation doesn't lock all partitions).
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*/
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TEST(PartitionedRwlock, Concurrent) {
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const uint PARTS_NUM = 32;
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Partitioned_rwlock rwlock;
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volatile uint shared_counter = 0;
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rwlock.init(PARTS_NUM
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#ifdef HAVE_PSI_INTERFACE
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,
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PSI_NOT_INSTRUMENTED
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#endif
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);
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Reader_thread readers[PARTS_NUM];
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Writer_thread writer(&rwlock, &shared_counter);
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for (uint i = 0; i < PARTS_NUM; ++i)
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readers[i].init(i, &rwlock, &shared_counter);
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writer.start();
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for (uint i = 0; i < PARTS_NUM; ++i) readers[i].start();
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for (uint i = 0; i < PARTS_NUM; ++i) readers[i].join();
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writer.join();
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rwlock.destroy();
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}
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} // namespace partitioned_rwlock_unittest
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