diff -ru apr-1.5.0/include/apr_network_io.h apr-1.5.0.new/include/apr_network_io.h
--- apr-1.5.0/include/apr_network_io.h	2013-11-12 09:26:22.000000000 -0500
+++ apr-1.5.0.new/include/apr_network_io.h	2013-12-10 01:58:15.263988007 -0500
@@ -65,6 +65,7 @@
 #define APR_SO_DEBUG         4    /**< Debug */
 #define APR_SO_NONBLOCK      8    /**< Non-blocking IO */
 #define APR_SO_REUSEADDR     16   /**< Reuse addresses */
+#define APR_SO_REUSEPORT     32   /**< Reuse port */
 #define APR_SO_SNDBUF        64   /**< Send buffer */
 #define APR_SO_RCVBUF        128  /**< Receive buffer */
 #define APR_SO_DISCONNECTED  256  /**< Disconnected */
@@ -616,6 +617,8 @@
  *            APR_SO_REUSEADDR  --  The rules used in validating addresses
  *                                  supplied to bind should allow reuse
  *                                  of local addresses.
+ *            APR_SO_REUSEPORT  --  This enable multiple sockets listen to 
+ *                                  the same ipaddress:port. 
  *            APR_SO_SNDBUF     --  Set the SendBufferSize
  *            APR_SO_RCVBUF     --  Set the ReceiveBufferSize
  * </PRE>
@@ -650,6 +653,8 @@
  *            APR_SO_REUSEADDR  --  The rules used in validating addresses
  *                                  supplied to bind should allow reuse
  *                                  of local addresses.
+ *            APR_SO_REUSEPORT  --  enable multiple sockets listen to 
+ *                                  the same ipaddress:port.
  *            APR_SO_SNDBUF     --  Set the SendBufferSize
  *            APR_SO_RCVBUF     --  Set the ReceiveBufferSize
  *            APR_SO_DISCONNECTED -- Query the disconnected state of the socket.
diff -ru apr-1.5.0/network_io/unix/sockopt.c apr-1.5.0.new/network_io/unix/sockopt.c
--- apr-1.5.0/network_io/unix/sockopt.c	2012-11-07 11:10:09.000000000 -0500
+++ apr-1.5.0.new/network_io/unix/sockopt.c	2013-12-10 02:03:05.121983374 -0500
@@ -161,6 +161,20 @@
             apr_set_option(sock, APR_SO_REUSEADDR, on);
         }
         break;
+/* SO_REUSEPORT is enabled in the Linux kernel newer than 3.9. It allows
+ * multiple sockets listen to the same ipaddress:port. 
+ */
+    case APR_SO_REUSEPORT:
+#ifndef SO_REUSEPORT
+#define SO_REUSEPORT 15
+        if(on != apr_is_option_set(sock, APR_SO_REUSEPORT)) {
+            if (setsockopt(sock->socketdes, SOL_SOCKET, SO_REUSEPORT, (void *)&one, sizeof(int)) == -1) {
+                return errno;
+            }
+            apr_set_option(sock, APR_SO_REUSEPORT, on);
+        }
+#endif
+        break;
     case APR_SO_SNDBUF:
 #ifdef SO_SNDBUF
         if (setsockopt(sock->socketdes, SOL_SOCKET, SO_SNDBUF, (void *)&on, sizeof(int)) == -1) {