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/**
* Copyright (C) 2020-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include <vector>
#include "mongo/stdx/thread.h"
#include "mongo/unittest/barrier.h"
#include "mongo/unittest/death_test.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/thread_safety_context.h"
#include "mongo/util/time_support.h"
namespace mongo {
class ThreadSafetyContextTest : public unittest::Test {
public:
void setUp() override {
// Always start tests with a clean context
resetContext();
}
void tearDown() override {
// Clear the context for the next test
resetContext();
}
private:
void resetContext() {
auto context = ThreadSafetyContext::getThreadSafetyContext();
context->_isSingleThreaded.store(true);
context->_safeToCreateThreads.store(true);
}
};
TEST_F(ThreadSafetyContextTest, CreateThreadsWithNoSafetyContext) {
constexpr auto threadCount = 16;
std::vector<stdx::thread> threads;
for (auto i = 0; i < threadCount; i++) {
threads.emplace_back([] { sleepFor(Milliseconds(10)); });
}
for (auto i = 0; i < threadCount; i++) {
threads[i].join();
}
}
DEATH_TEST_F(ThreadSafetyContextTest, CreateThreadsAfterForbidingMultiThreading, "invariant") {
ThreadSafetyContext::getThreadSafetyContext()->forbidMultiThreading();
// Must terminate after starting the thread
auto thread = stdx::thread([] { sleepFor(Milliseconds(50)); });
thread.join();
}
DEATH_TEST_F(ThreadSafetyContextTest, ForbidMultiThreadingAfterCreatingThreads, "invariant") {
unittest::Barrier barrier(2);
auto thread = stdx::thread([&]() mutable {
barrier.countDownAndWait();
sleepFor(Milliseconds(50));
});
// Wait for the thread to start before proceeding with the test
barrier.countDownAndWait();
ThreadSafetyContext::getThreadSafetyContext()->forbidMultiThreading();
// Must never reach here or the test fails
}
TEST_F(ThreadSafetyContextTest, CreateThreadsAfterSafetyContext) {
ThreadSafetyContext::getThreadSafetyContext()->forbidMultiThreading();
// Do something inside the single-threaded context
sleepFor(Milliseconds(10));
ThreadSafetyContext::getThreadSafetyContext()->allowMultiThreading();
constexpr auto threadCount = 16;
std::vector<stdx::thread> threads;
for (auto i = 0; i < threadCount; i++) {
threads.emplace_back([] { sleepFor(Milliseconds(10)); });
}
for (auto i = 0; i < threadCount; i++) {
threads[i].join();
}
}
} // namespace mongo
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