tdlight/tdutils/test/EpochBasedMemoryReclamation.cpp

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//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2021
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/common.h"
#include "td/utils/EpochBasedMemoryReclamation.h"
#include "td/utils/logging.h"
#include "td/utils/port/thread.h"
#include "td/utils/Random.h"
#include "td/utils/tests.h"
#include <atomic>
#if !TD_THREAD_UNSUPPORTED
TEST(EpochBaseMemoryReclamation, stress) {
struct Node {
std::atomic<std::string *> name_{nullptr};
char pad[64];
};
int threads_n = 10;
std::vector<Node> nodes(threads_n);
td::EpochBasedMemoryReclamation<std::string> ebmr(threads_n + 1);
auto locker = ebmr.get_locker(threads_n);
locker.lock();
locker.unlock();
std::vector<td::thread> threads(threads_n);
int thread_id = 0;
for (auto &thread : threads) {
thread = td::thread([&, thread_id] {
auto locker = ebmr.get_locker(thread_id);
locker.lock();
for (int i = 0; i < 1000000; i++) {
auto &node = nodes[td::Random::fast(0, threads_n - 1)];
auto *str = node.name_.load(std::memory_order_acquire);
if (str) {
CHECK(*str == "one" || *str == "twotwo");
}
if ((i + 1) % 100 == 0) {
locker.retire();
}
if (td::Random::fast(0, 5) == 0) {
std::string *new_str = new std::string(td::Random::fast_bool() ? "one" : "twotwo");
if (node.name_.compare_exchange_strong(str, new_str, std::memory_order_acq_rel)) {
locker.retire(str);
} else {
delete new_str;
}
}
}
locker.retire_sync();
locker.unlock();
});
thread_id++;
}
for (auto &thread : threads) {
thread.join();
}
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LOG(INFO) << "Undeleted pointers: " << ebmr.to_delete_size_unsafe();
//CHECK(static_cast<int>(ebmr.to_delete_size_unsafe()) <= threads_n * threads_n);
for (int i = 0; i < threads_n; i++) {
ebmr.get_locker(i).retire_sync();
}
CHECK(ebmr.to_delete_size_unsafe() == 0);
}
#endif //!TD_THREAD_UNSUPPORTED