Set TCP_QUICKACK on Linux to improve responsiveness when using client/service configuration

NetworkClient.cpp

@@ -25,6 +25,13 @@
 #ifdef __linux__
 #include <unistd.h>
 #include <sys/select.h>
+#include <netinet/tcp.h>
+#endif
+
+#ifdef __linux__
+const int yes = 1;
+#else
+const char yes = 1;
 #endif
 
 using namespace std::chrono_literals;
@@ -438,6 +445,13 @@ int NetworkClient::recv_select(SOCKET s, char *buf, int len, int flags)
         }
         else
         {
+        /*-------------------------------------------------*\
+        | Set QUICKACK socket option on Linux to improve    |
+        | performance                                       |
+        \*-------------------------------------------------*/
+#ifdef __linux__
+            setsockopt(s, IPPROTO_TCP, TCP_QUICKACK, &yes, sizeof(yes));
+#endif
             return(recv(s, buf, len, flags));
         }
 

NetworkServer.cpp

@@ -26,14 +26,18 @@
 #include <stdlib.h>
 #include <iostream>
 
-const char yes = 1;
-
 #ifdef WIN32
 #include <Windows.h>
 #else
 #include <unistd.h>
 #endif
 
+#ifdef __linux__
+const int yes = 1;
+#else
+const char yes = 1;
+#endif
+
 using namespace std::chrono_literals;
 
 NetworkClientInfo::NetworkClientInfo()
@@ -548,6 +552,13 @@ int NetworkServer::recv_select(SOCKET s, char *buf, int len, int flags)
         }
         else
         {
+        /*-------------------------------------------------*\
+        | Set QUICKACK socket option on Linux to improve    |
+        | performance                                       |
+        \*-------------------------------------------------*/
+#ifdef __linux__
+            setsockopt(s, IPPROTO_TCP, TCP_QUICKACK, &yes, sizeof(yes));
+#endif
             return(recv(s, buf, len, flags));
         }
     }

net_port/net_port.cpp

@@ -29,7 +29,11 @@
 #define connect_socklen_t socklen_t
 #endif
 
+#ifdef __linux__
+const int yes = 1;
+#else
 const char yes = 1;
+#endif
 
 net_port::net_port()
 {
@@ -328,6 +332,13 @@ void net_port::tcp_close()
 
 int net_port::tcp_listen(char * recv_data, int length)
 {
+    /*-------------------------------------------------*\
+    | Set QUICKACK socket option on Linux to improve    |
+    | performance                                       |
+    \*-------------------------------------------------*/
+#ifdef __linux__
+    setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, &yes, sizeof(yes));
+#endif
     return(recv(sock, recv_data, length, 0));
 }