114 lines
2.4 KiB
C++
114 lines
2.4 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "rwmutex.h"
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include <array>
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#include <thread>
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#include <vector>
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namespace {
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constexpr const size_t NumThreads = 8;
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}
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// Check that WLock behaves like regular mutex.
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TEST(RWMutex, WLock) {
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dap::RWMutex rwmutex;
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int counter = 0;
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std::vector<std::thread> threads;
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for (size_t i = 0; i < NumThreads; i++) {
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threads.emplace_back([&] {
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for (int j = 0; j < 1000; j++) {
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dap::WLock lock(rwmutex);
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counter++;
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EXPECT_EQ(counter, 1);
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counter--;
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}
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});
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}
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for (auto& thread : threads) {
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thread.join();
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}
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EXPECT_EQ(counter, 0);
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}
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TEST(RWMutex, NoRLockWithWLock) {
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dap::RWMutex rwmutex;
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std::vector<std::thread> threads;
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std::array<int, NumThreads> counters = {};
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{ // With WLock held...
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dap::WLock wlock(rwmutex);
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for (size_t i = 0; i < counters.size(); i++) {
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int* counter = &counters[i];
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threads.emplace_back([&rwmutex, counter] {
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dap::RLock lock(rwmutex);
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for (int j = 0; j < 1000; j++) {
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(*counter)++;
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}
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});
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}
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// RLocks should block
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for (int counter : counters) {
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EXPECT_EQ(counter, 0);
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}
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}
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for (auto& thread : threads) {
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thread.join();
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}
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for (int counter : counters) {
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EXPECT_EQ(counter, 1000);
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}
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}
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TEST(RWMutex, NoWLockWithRLock) {
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dap::RWMutex rwmutex;
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std::vector<std::thread> threads;
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size_t counter = 0;
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{ // With RLocks held...
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dap::RLock rlockA(rwmutex);
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dap::RLock rlockB(rwmutex);
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dap::RLock rlockC(rwmutex);
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for (size_t i = 0; i < NumThreads; i++) {
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threads.emplace_back(std::thread([&] {
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dap::WLock lock(rwmutex);
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counter++;
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}));
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}
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// ... WLocks should block
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EXPECT_EQ(counter, 0U);
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}
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for (auto& thread : threads) {
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thread.join();
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}
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EXPECT_EQ(counter, NumThreads);
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}
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