1 files changed, 70 insertions, 0 deletions
diff --git a/zto/node/AtomicCounter.hpp b/zto/node/AtomicCounter.hpp
new file mode 100644
index 0000000..a0f29ba
--- /dev/null
+++ b/zto/node/AtomicCounter.hpp
@@ -0,0 +1,70 @@
+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2016  ZeroTier, Inc.  https://www.zerotier.com/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ZT_ATOMICCOUNTER_HPP
+#define ZT_ATOMICCOUNTER_HPP
+
+#include "Constants.hpp"
+#include "NonCopyable.hpp"
+
+#ifndef __GNUC__
+#include <atomic>
+#endif
+
+namespace ZeroTier {
+
+/**
+ * Simple atomic counter supporting increment and decrement
+ */
+class AtomicCounter : NonCopyable
+{
+public:
+	AtomicCounter()
+	{
+		_v = 0;
+	}
+
+	inline int operator++()
+	{
+#ifdef __GNUC__
+		return __sync_add_and_fetch(&_v,1);
+#else
+		return ++_v;
+#endif
+	}
+
+	inline int operator--()
+	{
+#ifdef __GNUC__
+		return __sync_sub_and_fetch(&_v,1);
+#else
+		return --_v;
+#endif
+	}
+
+private:
+#ifdef __GNUC__
+	int _v;
+#else
+	std::atomic_int _v;
+#endif
+};
+
+} // namespace ZeroTier
+
+#endif