1 files changed, 68 insertions, 0 deletions
diff --git a/protocols/Telegram/tdlib/td/tdutils/test/EpochBasedMemoryReclamation.cpp b/protocols/Telegram/tdlib/td/tdutils/test/EpochBasedMemoryReclamation.cpp
new file mode 100644
index 0000000000..c97679bb83
--- /dev/null
+++ b/protocols/Telegram/tdlib/td/tdutils/test/EpochBasedMemoryReclamation.cpp
@@ -0,0 +1,68 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
+//
+// 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) {
+          auto *new_str = new td::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();
+  }
+  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