(socket server) do not create a select interrupt object everytime when polling for notifications while waiting for new connections, instead use a persistent one which is a member variable

ixwebsocket/IXSocket.h

@@ -34,12 +34,10 @@ typedef SSIZE_T ssize_t;
 
 #include "IXCancellationRequest.h"
 #include "IXProgressCallback.h"
+#include "IXSelectInterrupt.h"
 
 namespace ix
 {
-    class SelectInterrupt;
-    using SelectInterruptPtr = std::unique_ptr<SelectInterrupt>;
-
     enum class PollResultType
     {
         ReadyForRead = 0,
@@ -96,11 +94,6 @@ namespace ix
                                    int sockfd,
                                    const SelectInterruptPtr& selectInterrupt);
 
-
-        // Used as special codes for pipe communication
-        static const uint64_t kSendRequest;
-        static const uint64_t kCloseRequest;
-
     protected:
         std::atomic<int> _sockfd;
         std::mutex _socketMutex;