src: added ReaderWriterLock, helpers and Semaphore

src/lib/utility/synchronization/ReaderWriterLock.h

@@ -0,0 +1,30 @@
+#ifndef READER_WRITER_LOCK_H
+#define READER_WRITER_LOCK_H
+
+#include <mutex>
+#include "Semaphore.h"
+
+class ReaderWriterLock
+{
+public:
+	ReaderWriterLock();
+
+private:
+	ReaderWriterLock(const ReaderWriterLock &lock);
+
+public:
+	~ReaderWriterLock();
+
+	void readerLock();
+	void readerUnlock();
+	void writerLock();
+	void writerUnlock();
+
+private:
+	int m_readerCount;
+	std::mutex m_readerCountMutex;
+	Semaphore m_allowedReaders, m_allowedWriters;
+};
+
+#endif // READER_WRITER_LOCK_H
+