From caf6150e9785da408f1e603ae70eae25b5202d98 Mon Sep 17 00:00:00 2001
From: Huang Le <4tarhl@gmail.com>
Date: Fri, 27 Jun 2014 02:55:39 +0800
Subject: Use async name resolving to improve net thread responsiveness

In the LookupIntern(), things changed are:

  1. Call getaddrinfo_a() instead of getaddrinfo() if available, the former is a sync version of the latter;
  2. Try using inet_pton()/inet_addr() to convert the input text to a network addr structure at first, if success the extra name resolving thread inside getaddrinfo_a() could be avoided;
  3.  An interruption point added in the waiting loop for return from getaddrinfo_a(), which completes the improve for thread responsiveness.

A easy way to see the effect is to kick off a 'bitcoind stop' immediately after 'bitcoind -daemon', before the change it would take several, or even tens of, minutes on a bad network situation to wait for the running bitcoind to exit, now it costs only seconds.

Signed-off-by: Huang Le <4tarhl@gmail.com>
---
 configure.ac | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 811ef1dd80..3abf94f136 100644
--- a/configure.ac
+++ b/configure.ac
@@ -369,6 +369,8 @@ if test x$TARGET_OS = xdarwin; then
 fi
 
 AC_CHECK_HEADERS([endian.h stdio.h stdlib.h unistd.h strings.h sys/types.h sys/stat.h sys/select.h])
+AC_SEARCH_LIBS([getaddrinfo_a], [anl], [AC_DEFINE(HAVE_GETADDRINFO_A, 1, [Define this symbol if you have getaddrinfo_a])])
+AC_SEARCH_LIBS([inet_pton], [nsl resolv], [AC_DEFINE(HAVE_INET_PTON, 1, [Define this symbol if you have inet_pton])])
 
 AC_CHECK_DECLS([le32toh, le64toh, htole32, htole64, be32toh, be64toh, htobe32, htobe64],,,
 		[#if HAVE_ENDIAN_H
-- 
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