Rearranged the logic

server/mail_box.hpp

@@ -0,0 +1,28 @@
+#ifndef MAILBOX_HPP_
+#define MAILBOX_HPP_
+
+#include "SDL/SDL_thread.h"
+
+#include <deque>
+#include <string>
+
+//Thread safe mailbox
+class MailBox {
+public:
+	MailBox();
+	~MailBox();
+
+	std::string PushIn(std::string);
+	std::string PeekIn();
+	std::string PopIn();
+	std::string PushOut(std::string);
+	std::string PeekOut();
+	std::string PopOut();
+private:
+	std::deque<std::string> input;
+	std::deque<std::string> output;
+	SDL_mutex* inLock = nullptr;
+	SDL_mutex* outLock = nullptr;
+};
+
+#endif