1 files changed, 54 insertions, 0 deletions
diff --git a/libtransport/src/io_modules/forwarder/global_id_counter.h b/libtransport/src/io_modules/forwarder/global_id_counter.h
new file mode 100644
index 000000000..fe8d76730
--- /dev/null
+++ b/libtransport/src/io_modules/forwarder/global_id_counter.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2021 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <atomic>
+#include <mutex>
+
+namespace transport {
+
+namespace core {
+
+template <typename T = uint64_t>
+class GlobalCounter {
+ public:
+  static GlobalCounter& getInstance() {
+    std::lock_guard<std::mutex> lock(global_mutex_);
+
+    if (!instance_) {
+      instance_.reset(new GlobalCounter());
+    }
+
+    return *instance_;
+  }
+
+  T getNext() { return counter_++; }
+
+ private:
+  GlobalCounter() : counter_(0) {}
+  static std::unique_ptr<GlobalCounter<T>> instance_;
+  static std::mutex global_mutex_;
+  std::atomic<T> counter_;
+};
+
+template <typename T>
+std::unique_ptr<GlobalCounter<T>> GlobalCounter<T>::instance_ = nullptr;
+
+template <typename T>
+std::mutex GlobalCounter<T>::global_mutex_;
+
+}  // namespace core
+}  // namespace transport
+\ No newline at end of file