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-rw-r--r--src/include/counter.h56
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diff --git a/src/include/counter.h b/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