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initial commit 2019-09-07 14:03:22 +04:00 • committed by vvaltman
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tdutils/test/HazardPointers.cpp Normal file
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/*
This file is part of TON Blockchain Library.
TON Blockchain Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
TON Blockchain Library 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
Copyright 2017-2019 Telegram Systems LLP
*/
#include "td/utils/common.h"
#include "td/utils/HazardPointers.h"
#include "td/utils/logging.h"
#include "td/utils/port/thread.h"
#include "td/utils/Random.h"
#include "td/utils/Slice.h"
#include "td/utils/tests.h"
#include <atomic>
#if !TD_THREAD_UNSUPPORTED
TEST(HazardPointers, stress) {
struct Node {
std::atomic<std::string *> name_{nullptr};
char pad[64];
};
int threads_n = 10;
std::vector<Node> nodes(threads_n);
td::HazardPointers<std::string> hazard_pointers(threads_n);
std::vector<td::thread> threads(threads_n);
int thread_id = 0;
for (auto &thread : threads) {
thread = td::thread([&, thread_id] {
std::remove_reference_t<decltype(hazard_pointers)>::Holder holder(hazard_pointers, thread_id, 0);
for (int i = 0; i < 1000000; i++) {
auto &node = nodes[td::Random::fast(0, threads_n - 1)];
auto *str = holder.protect(node.name_);
if (str) {
CHECK(*str == td::Slice("one") || *str == td::Slice("twotwo"));
}
holder.clear();
if (td::Random::fast(0, 5) == 0) {
std::string *new_str = new std::string(td::Random::fast(0, 1) == 0 ? "one" : "twotwo");
if (node.name_.compare_exchange_strong(str, new_str, std::memory_order_acq_rel)) {
hazard_pointers.retire(thread_id, str);
} else {
delete new_str;
}
}
}
});
thread_id++;
}
for (auto &thread : threads) {
thread.join();
}
LOG(ERROR) << "Undeleted pointers: " << hazard_pointers.to_delete_size_unsafe();
CHECK(static_cast<int>(hazard_pointers.to_delete_size_unsafe()) <= threads_n * threads_n);
for (int i = 0; i < threads_n; i++) {
hazard_pointers.retire(i);
}
CHECK(hazard_pointers.to_delete_size_unsafe() == 0);
}
#endif //!TD_THREAD_UNSUPPORTED