trim headers and unused code in IXUdpSocket

ixwebsocket/IXUdpSocket.h

@@ -7,59 +7,34 @@
 #pragma once
 
 #include <atomic>
-#include <functional>
 #include <memory>
-#include <mutex>
 #include <string>
 
 #ifdef _WIN32
 #include <BaseTsd.h>
 typedef SSIZE_T ssize_t;
-
-#undef EWOULDBLOCK
-#undef EAGAIN
-#undef EINPROGRESS
-#undef EBADF
-#undef EINVAL
-
-// map to WSA error codes
-#define EWOULDBLOCK WSAEWOULDBLOCK
-#define EAGAIN WSATRY_AGAIN
-#define EINPROGRESS WSAEINPROGRESS
-#define EBADF WSAEBADF
-#define EINVAL WSAEINVAL
-
 #endif
 
-#include "IXCancellationRequest.h"
 #include "IXNetSystem.h"
 
 namespace ix
 {
-    class SelectInterrupt;
-
     class UdpSocket
     {
     public:
         UdpSocket(int fd = -1);
-        virtual ~UdpSocket();
+        ~UdpSocket();
 
         // Virtual methods
         bool init(const std::string& host, int port, std::string& errMsg);
         ssize_t sendto(const std::string& buffer);
-        virtual void close();
+        void close();
 
         static int getErrno();
-        static bool isWaitNeeded();
         static void closeSocket(int fd);
 
-    protected:
-        std::atomic<int> _sockfd;
-        std::mutex _socketMutex;
-
-        struct sockaddr_in _server;
-
     private:
-        std::shared_ptr<SelectInterrupt> _selectInterrupt;
+        std::atomic<int> _sockfd;
+        struct sockaddr_in _server;
     };
 } // namespace ix