add reader writer header, fix cmakelists

include/reader_writer.h

@@ -0,0 +1,29 @@
+//
+// Created by lumijiez on 12/8/24.
+//
+
+#ifndef READER_WRITER_H
+#define READER_WRITER_H
+
+#include <semaphore.h>
+#include <fstream>
+
+class ReaderWriter {
+public:
+    ReaderWriter(int numReaders, int numWriters, const std::string& filename);
+    ~ReaderWriter();
+    void run();
+
+private:
+    int numReaders;
+    int numWriters;
+    std::string filename;
+
+    sem_t resourceAccess;
+    sem_t readCountAccess;
+    int readCount;
+
+    static void* reader(void* arg);
+    static void* writer(void* arg);
+};
+#endif //READER_WRITER_H