src/java.base/windows/native/libnet/PlainSocketImpl.c

rev 53869 : 8250521: Configure initial RTO to use minimal retry for loopback connections on Windows

*** 116,132 ****
--- 116,145 ----
   */
  JNIEXPORT jint JNICALL Java_java_net_PlainSocketImpl_connect0
    (JNIEnv *env, jclass clazz, jint fd, jobject iaObj, jint port) {
      SOCKETADDRESS sa;
      int rv, sa_len = 0;
+     int so_rv;
+     SOCKET s = (SOCKET)fd;
+     int type = 0, optlen = sizeof(type);
      jboolean v4MappedAddress = ipv6_available() ? JNI_TRUE : JNI_FALSE;
  
      if (NET_InetAddressToSockaddr(env, iaObj, port, &sa,
                                    &sa_len, v4MappedAddress) != 0) {
          return -1;
      }
  
+     so_rv = getsockopt(s, SOL_SOCKET, SO_TYPE, (char*)&type, &optlen);
+ 
+     /**
+      * Windows has a very long socket connect timeout of 2 seconds.
+      * If it's the loopback adapter we can shorten the wait interval.
+      */
+     if (so_rv == 0 && type == SOCK_STREAM && IS_LOOPBACK_ADDRESS(&sa)) {
+         NET_EnableFastTcpLoopbackConnect(fd);
+     }
+ 
      rv = connect(fd, &sa.sa, sa_len);
      if (rv == SOCKET_ERROR) {
          int err = WSAGetLastError();
          if (err == WSAEWOULDBLOCK) {
              return java_net_PlainSocketImpl_WOULDBLOCK;