Locking: add SpinLock class

Nothing much to add: add a spinlock which has a tryAcquire method.
This will be used as a primitive for building our spinQing locking
system.

include/spinLock.h

@@ -0,0 +1,35 @@
+#ifndef SPIN_LOCK_H
+#define SPIN_LOCK_H
+
+#include <atomic>
+
+namespace smo {
+
+/**
+ * @brief Simple spinlock using std::atomic
+ */
+class SpinLock
+{
+public:
+	SpinLock()
+	: locked(false)
+	{}
+
+	bool tryAcquire()
+	{
+		bool expected = false;
+		return locked.compare_exchange_strong(expected, true);
+	}
+
+	void release()
+	{
+		locked.store(false);
+	}
+
+private:
+	std::atomic<bool> locked;
+};
+
+} // namespace smo
+
+#endif // SPIN_LOCK_H