Test blocking socket for threads service.

Author: zhengshuxin

lib_acl/src/master/template/acl_threads_server.c

@@ -787,13 +787,14 @@ static void server_accept_sock(int event_type, ACL_EVENT *event,
 				memset(local, 0, sizeof(local));
 			}
 
-#if defined(_WIN32) || defined(_WIN64)
 			// On windows, the client socket will use the non-block attribute
 			// of the listen socket, because we've set the listen socket in
 			// non-blocking status, so we should set the client socket again
 			// in blocking status.
+			// And on unix the client socket will not use it from
+			// the listen socket, and we set it to be in blocking
+			// status is harmless.
 			acl_non_blocking(fd, ACL_BLOCKING);
-#endif
 
 			client_open(event, threads, fd, remote, local);
 			continue;