initial code repo

[stor4nfv.git] / src / ceph / src / include / counter.h

diff --git a/src/ceph/src/include/counter.h b/src/ceph/src/include/counter.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 Red Hat, Inc.
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_COUNTER_H
+#define CEPH_COUNTER_H
+
+#include <atomic>
+
+template <typename T>
+class Counter {
+public:
+  Counter() {
+    _count()++;
+    _increments()++;
+  }
+  Counter(const Counter &rhs) {
+    _count()++;
+    _increments()++;
+  }
+  Counter(Counter &&rhs) {}
+  ~Counter() {
+    _count()--;
+  }
+  static uint64_t count() {
+    return _count();
+  }
+  static uint64_t increments() {
+    return _increments();
+  }
+  static uint64_t decrements() {
+    return increments()-count();
+  }
+
+private:
+  static std::atomic<uint64_t> &_count() {
+    static std::atomic<uint64_t> c;
+    return c;
+  }
+  static std::atomic<uint64_t> &_increments() {
+    static std::atomic<uint64_t> i;
+    return i;
+  }
+};
+
+#endif